{"id":2611,"date":"2016-11-11T02:22:33","date_gmt":"2016-11-11T02:22:33","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=2611"},"modified":"2024-09-02T15:12:59","modified_gmt":"2024-09-02T15:12:59","slug":"hidrostatica","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/raciocinio-logico\/hidrostatica\/","title":{"rendered":"Hidrost\u00e1tica"},"content":{"rendered":"

RACIOC\u00cdNIO L\u00d3GICO<\/b><\/span><\/span><\/p>\n

HIDROST\u00c1TICA<\/b><\/span><\/span><\/span><\/p>\n

Como esse conte\u00fado envolve muita teoria, em caso de d\u00favidas voc\u00ea pode encontr\u00e1-la em <\/b><\/span><\/span><\/span><\/p>\n

fisicaevestibular.com.br \u2013 Mec\u00e2nica \u2013 Hidrost\u00e1tica)<\/b><\/span><\/span><\/span><\/p>\n

01-(UEPA-PA)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>peixe-gota<\/b><\/span><\/span><\/span> (“Psychrolutes marcidus”),\u00a0uma <\/b><\/span><\/span><\/span>esp\u00e9cie do Pac\u00ed<\/b><\/span><\/span><\/span>fico que lembra um senhor velho e<\/b><\/span><\/span><\/span><\/p>\n

amargurado, foi eleito o <\/b><\/span><\/span><\/span>animal mais feio do mundo <\/b><\/span><\/span><\/span>em um concurso organizado na Gr\u00e3-Bretanha.<\/b><\/span><\/span><\/span>\"\"<\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>peixe-gota \u00e9 capaz de suportar uma press\u00e3o m\u00e1xima de 121 vezes a press\u00e3o atmosf\u00e9rica.<\/b><\/span><\/span><\/span><\/p>\n

Nessas condi\u00e7\u00f5es,\u00a0a <\/b><\/span><\/span><\/span>profundidade m\u00e1xima em que vive este peixe, em metros<\/b><\/span><\/span><\/span>, \u00e9 igual a:<\/b><\/span><\/span><\/span><\/p>\n

Dados:<\/b><\/span><\/span><\/span>\u00a0Press\u00e3o atmosf\u00e9rica <\/b><\/span><\/span><\/span>=\u00a010<\/b><\/span><\/span><\/span>5<\/b><\/span><\/span><\/sup><\/span>\u00a0N\/m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>; Densidade da \u00e1gua <\/b><\/span><\/span><\/span>=\u00a010<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>\u00a0kg\/m<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>; Acelera\u00e7\u00e3o da gravidade <\/b><\/span><\/span><\/span>=\u00a010 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

02-(UEPA-PA)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

As\u00a0<\/b><\/span><\/span><\/span>balsas<\/b><\/span><\/span><\/span>\u00a0est\u00e3o entre os\u00a0<\/b><\/span><\/span><\/span>ve\u00edculos<\/b><\/span><\/span><\/span>\u00a0mais utilizados para\u00a0<\/b><\/span><\/span><\/span>transporte nos rios da Amaz\u00f4nia, <\/b><\/span><\/span><\/span>pois<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

apresentam\u00a0espessuras relativamente pequenas,<\/b><\/span><\/span><\/span> o que lhes <\/b><\/span><\/span><\/span>permite navegar em rios\u00a0com trechos<\/b><\/span><\/span><\/span><\/p>\n

de <\/b><\/span><\/span><\/span>pouca profundidade. <\/b><\/span><\/span><\/span><\/p>\n

Considere um\u00a0<\/b><\/span><\/span><\/span>modelo simplificado de balsa, <\/b><\/span><\/span><\/span>cujo <\/b><\/span><\/span><\/span>casco tem a forma <\/b><\/span><\/span><\/span>de<\/b><\/span><\/span><\/span><\/p>\n

um <\/b><\/span><\/span><\/span>paralelep\u00edpedo de dimens\u00f5es 30 m X 10 m X 2 m, <\/b><\/span><\/span><\/span>e suponha que <\/b><\/span><\/span><\/span>essa balsa\u00a0esteja navegando em<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

um trecho de rio de 1,8 m de profundidade.<\/b><\/span><\/span><\/span><\/p>\n

Admitindo que <\/b><\/span><\/span><\/span>essa balsa tenha uma\u00a0massa de 150 t\u00a0e que a\u00a0dist\u00e2ncia m\u00ednima de seguran\u00e7a do fundo do casco para o leito do rio seja de 1 m, <\/b><\/span><\/span><\/span>afirma-se que a\u00a0<\/b><\/span><\/span><\/span>sua capacidade m\u00e1xima de carga\u00a0para poder navegar sem problemas nesse trecho de rio, em\u00a0t,\u00a0\u00e9 igual a:<\/b><\/span><\/span><\/span><\/p>\n

Dado:<\/b><\/span><\/span><\/span>\u00a0Acelera\u00e7\u00e3o da gravidade <\/b><\/span><\/span><\/span>=\u00a010 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>; Densidade da \u00e1gua <\/b><\/span><\/span><\/span>=\u00a010<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>\u00a0kg\/m<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

03-(UFPA-PA) <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma\u00a0<\/b><\/span><\/span><\/span>crian\u00e7a brinca com um balde de \u00e1gua, <\/b><\/span><\/span><\/span>um <\/b><\/span><\/span><\/span>barquinho e uma \u00e2ncora de metal<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

Na\u00a0<\/b><\/span><\/span><\/span>situa\u00e7\u00e3o \u201cA\u201d,<\/b><\/span><\/span><\/span> <\/b>a\u00a0crian\u00e7a <\/b><\/span><\/span><\/span>coloca o barquinho flutuando na \u00e1gua.<\/b><\/span><\/span><\/span> <\/b>\"\"<\/p>\n

Na\u00a0<\/b><\/span><\/span><\/span>situa\u00e7\u00e3o \u201cB\u201d,\u00a0<\/b><\/span><\/span><\/span>coloca o\u00a0<\/b><\/span><\/span><\/span>barquinho flutuando com a \u00e2ncora dentro do barquinho. <\/b><\/span><\/span><\/span><\/p>\n

Na\u00a0<\/b><\/span><\/span><\/span>situa\u00e7\u00e3o \u201cC\u201d,\u00a0<\/b><\/span><\/span><\/span>joga a <\/b><\/span><\/span><\/span>\u00e2ncora no fundo do balde<\/b><\/span><\/span><\/span> e o barquinho <\/b><\/span><\/span><\/span>flutuando na superf\u00edcie da \u00e1gua. Denotemos<\/b><\/span><\/span><\/span> por <\/b><\/span><\/span><\/span>N<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>, N<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>\u00a0e N<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span>,\u00a0as\u00a0alturas da superf\u00edcie da \u00e1gua do balde\u00a0nas situa\u00e7\u00f5es\u00a0\u201cA\u201d, \u201cB\u201d e \u201cC\u201d <\/b><\/span><\/span><\/span>respectivamente. Use a\u00a0<\/b><\/span><\/span><\/span>lei de Arquimedes para determinar qual das seguintes alternativas \u00e9 a correta.<\/b><\/span><\/span><\/span><\/p>\n

(A) <\/b><\/span><\/span><\/span>N<\/b><\/span><\/span><\/span>A\u00a0<\/b><\/span><\/span><\/sub><\/span>> N<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>\u00a0> N<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span>\u00a0<\/b><\/span><\/span><\/span><\/p>\n

(B) <\/b><\/span><\/span><\/span>N<\/b><\/span><\/span><\/span>C\u00a0<\/b><\/span><\/span><\/sub><\/span>> N<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>\u00a0> N<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\u00a0<\/b><\/span><\/span><\/span><\/p>\n

(C) <\/b><\/span><\/span><\/span>N<\/b><\/span><\/span><\/span>B\u00a0<\/b><\/span><\/span><\/sub><\/span>> N<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span>\u00a0> N<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\u00a0<\/b><\/span><\/span><\/span><\/p>\n

(D) <\/b><\/span><\/span><\/span>N<\/b><\/span><\/span><\/span>A\u00a0<\/b><\/span><\/span><\/sub><\/span>> N<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span>\u00a0> N<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>\u00a0<\/b><\/span><\/span><\/span><\/p>\n

(E) <\/b><\/span><\/span><\/span>N<\/b><\/span><\/span><\/span>C\u00a0<\/b><\/span><\/span><\/sub><\/span>> N<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>\u00a0> N<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span><\/p>\n

04-(UFRGS-RS)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Na <\/b><\/span><\/span><\/span>figura abaixo,<\/b><\/span><\/span><\/span> est\u00e3o representados\u00a0<\/b><\/span><\/span><\/span>tr\u00eas blocos\u00a0(A, B e C) de mesmas dimens\u00f5es,<\/b><\/span><\/span><\/span> que est\u00e3o em <\/b><\/span><\/span><\/span>equil\u00edbrio mec\u00e2nico na \u00e1gua.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Os\u00a0blocos A e B t\u00eam, respectivamente,\u00a03\/4 e 1\/4\u00a0de seus volumes\u00a0acima da superf\u00edcie, <\/b><\/span><\/span><\/span>enquanto o\u00a0<\/b><\/span><\/span><\/span>bloco C est\u00e1 totalmente submerso.<\/b><\/span><\/span><\/span><\/p>\n

Considerando que o\u00a0<\/b><\/span><\/span><\/span>bloco C tem peso P, os pesos de A e B s\u00e3o, respectivamente,<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

05-(ACAFE-SC)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Buscando\u00a0<\/b><\/span><\/span><\/span>aumentar a resist\u00eancia dos m\u00fasculos de um paciente<\/b><\/span><\/span><\/span>, um <\/b><\/span><\/span><\/span>fisioterapeuta <\/b><\/span><\/span><\/span>elaborou um<\/b><\/span><\/span><\/span><\/p>\n

exerc\u00edcio de hidrogin\u00e1stica com o auxilio de\u00a0uma bola. <\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>exerc\u00edcio consistia na atividade de\u00a0baixar<\/b><\/span><\/span><\/span> <\/b>uma bola de\u00a0raio r\u00a0metros e\u00a0massa 0,4 kg\u00a0at\u00e9 que sua base ficasse a uma profundidade de\u00a0h metros<\/b><\/span><\/span><\/span> <\/b>da <\/b><\/span><\/span><\/span>superf\u00edcie da \u00e1gua.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

Ap\u00f3s a <\/b><\/span><\/span><\/span>realiza\u00e7\u00e3o do exerc\u00edcio algumas vezes, o fisioterapeuta <\/b><\/span><\/span><\/span>observou que<\/b><\/span><\/span><\/span> <\/b>quando o <\/b><\/span><\/span><\/span>paciente abandonava a bola daquela profundidade ela subia certa altura acima da superf\u00edcie da \u00e1gua. <\/b><\/span><\/span><\/span><\/p>\n

Decidiu, ent\u00e3o, com o\u00a0<\/b><\/span><\/span><\/span>auxilio do gr\u00e1fico abaixo, que despreza a for\u00e7a de<\/b><\/span><\/span><\/span> <\/b>resist\u00eancia da \u00e1gua <\/b><\/span><\/span><\/span>e mostra o\u00a0<\/b><\/span><\/span><\/span>aumento da velocidade da bola enquanto est\u00e1 totalmente submersa, investigar<\/b><\/span><\/span><\/span> o <\/b><\/span><\/span><\/span>movimento da bola, e fez\u00a0algumas suposi\u00e7\u00f5es\u00a0a respeito desse movimento.<\/b><\/span><\/span><\/span><\/p>\n

Desprezando a <\/b><\/span><\/span><\/span>resist\u00eancia do ar, considerando que a bola sobe em linha reta e utilizando o gr\u00e1fico,<\/b><\/span><\/span><\/span>\"\"<\/p>\n

verifique <\/b><\/span><\/span><\/span>quais das suposi\u00e7\u00f5es levantadas pelo fisioterapeuta est\u00e3o corretas. <\/b><\/span><\/span><\/span>(considere a <\/b><\/span><\/span><\/span>posi\u00e7\u00e3o zero na profundidade m\u00e1xima)<\/b><\/span><\/span><\/span><\/p>\n

l.\u00a0<\/b><\/span><\/span><\/span>O <\/b><\/i><\/span><\/span><\/span>m\u00f3dulo do empuxo \u00e9 maior <\/b><\/i><\/span><\/span><\/span>que o <\/b><\/i><\/span><\/span><\/span>m\u00f3dulo do peso enquanto a bola estiver toda submersa.<\/b><\/i><\/span><\/span><\/span><\/p>\n

ll.\u00a0<\/b><\/span><\/span><\/span>A medida que a <\/b><\/i><\/span><\/span><\/span>bola sobe de 0 at\u00e9 0,50m o empuxo sobre ela diminui at\u00e9 que se iguala<\/b><\/i><\/span><\/span><\/span><\/p>\n

numeri<\/b><\/i><\/span><\/span><\/span>ca<\/b><\/span><\/span><\/span>mente ao peso.<\/b><\/i><\/span><\/span><\/span><\/p>\n

Ill.\u00a0<\/b><\/span><\/span><\/span>De acordo com o <\/b><\/i><\/span><\/span><\/span>gr\u00e1fico, ap\u00f3s o abandono da bola na profundidade indicada, <\/b><\/i><\/span><\/span><\/span>at\u00e9 imediatamente<\/b><\/i><\/span><\/span><\/span><\/p>\n

antes de tocar a superf\u00edcie da \u00e1gua, a bola sofre um empuxo superior a 15 N.<\/b><\/i><\/span><\/span><\/span><\/p>\n

lV.\u00a0<\/b><\/span><\/span><\/span>O <\/b><\/i><\/span><\/span><\/span>empuxo sobre a bola na profundidade de 0,66m \u00e9 o dobro do empuxo sobre a bola na<\/b><\/i><\/span><\/span><\/span><\/p>\n

profundidade de 0,25m.<\/b><\/i><\/span><\/span><\/span><\/p>\n

V.\u00a0<\/b><\/span><\/span><\/span>Quando a <\/b><\/i><\/span><\/span><\/span>bola come\u00e7a a sair da \u00e1gua<\/b><\/i><\/span><\/span><\/span>, o <\/b><\/i><\/span><\/span><\/span>empuxo que a \u00e1gua exerce sobre ela diminui <\/b><\/i><\/span><\/span><\/span>at\u00e9 que se<\/b><\/i><\/span><\/span><\/span><\/p>\n

anula, quando ela est\u00e1 totalmente fora da \u00e1gua, por\u00e9m, nesse intervalo de tempo sua velocidade<\/b><\/i><\/span><\/span><\/span><\/p>\n

aumenta para depois come\u00e7ar a diminuir.<\/b><\/i><\/span><\/span><\/span><\/p>\n

Todas\u00a0as <\/b><\/span><\/span><\/span>afirma\u00e7\u00f5es\u00a0corretas\u00a0<\/b><\/span><\/span><\/span>est\u00e3o em:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

06-(UECE-CE)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considere\u00a0um <\/b><\/span><\/span><\/span>cubo imerso em \u00e1gua, conforme a figura a seguir.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

No <\/b><\/span><\/span><\/span>ponto destacado de uma das faces desse cubo, <\/b><\/span><\/span><\/span>h\u00e1 uma <\/b><\/span><\/span><\/span>for\u00e7a devido \u00e0 press\u00e3o hidrost\u00e1tica exercida pela \u00e1gua. <\/b><\/span><\/span><\/span>Assinale o <\/b><\/span><\/span><\/span>vetor que melhor representa essa for\u00e7a.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

07-(UECE-CE)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Tr\u00eas s\u00f3lidos, <\/b><\/span><\/span><\/span>um <\/b><\/span><\/span><\/span>cubo<\/b><\/span><\/span><\/span>, um <\/b><\/span><\/span><\/span>cilindro<\/b><\/span><\/span><\/span> e uma <\/b><\/span><\/span><\/span>esfera,\u00a0<\/b><\/span><\/span><\/span>t\u00eam <\/b><\/span><\/span><\/span>massas iguais\u00a0e distribu\u00eddas<\/b><\/span><\/span><\/span>\"\"<\/p>\n

homogeneamente ao longo de seus volumes. <\/b><\/span><\/span><\/span>Os s\u00f3lidos <\/b><\/span><\/span><\/span>flutuam parcialmente submersos <\/b><\/span><\/span><\/span>em um<\/b><\/span><\/span><\/span><\/p>\n

mesmo l\u00edquido. <\/b><\/span><\/span><\/span>A\u00a0<\/b><\/span><\/span><\/span>rela\u00e7\u00e3o entre os volumes submersos\u00a0de cada objeto <\/b><\/span><\/span><\/span>\u00e9<\/b><\/span><\/span><\/span><\/p>\n

A) <\/b><\/span><\/span><\/span>\u0394<\/b><\/span><\/span><\/span>cub<\/b><\/span><\/span><\/sub><\/span>\u00a0> \u0394<\/b><\/span><\/span><\/span>cil<\/b><\/span><\/span><\/sub><\/span>\u00a0> \u0394<\/b><\/span><\/span><\/span>esf<\/b><\/span><\/span><\/sub><\/span>\u00a0. <\/b><\/span><\/span><\/span><\/p>\n

B) <\/b><\/span><\/span><\/span>\u0394<\/b><\/span><\/span><\/span>cub<\/b><\/span><\/span><\/sub><\/span>\u00a0= \u0394<\/b><\/span><\/span><\/span>cil<\/b><\/span><\/span><\/sub><\/span>\u00a0> \u0394<\/b><\/span><\/span><\/span>esf<\/b><\/span><\/span><\/sub><\/span>\u00a0. <\/b><\/span><\/span><\/span><\/p>\n

C) <\/b><\/span><\/span><\/span>\u0394<\/b><\/span><\/span><\/span>cub<\/b><\/span><\/span><\/sub><\/span>\u00a0> \u0394<\/b><\/span><\/span><\/span>cil<\/b><\/span><\/span><\/sub><\/span>\u00a0= \u0394<\/b><\/span><\/span><\/span>esf<\/b><\/span><\/span><\/sub><\/span>\u00a0. <\/b><\/span><\/span><\/span><\/p>\n

D) <\/b><\/span><\/span><\/span>\u0394<\/b><\/span><\/span><\/span>cub<\/b><\/span><\/span><\/sub><\/span>\u00a0= \u0394<\/b><\/span><\/span><\/span>cil<\/b><\/span><\/span><\/sub><\/span>\u00a0= \u0394<\/b><\/span><\/span><\/span>esf<\/b><\/span><\/span><\/sub><\/span>\u00a0.<\/b><\/span><\/span><\/span><\/p>\n

08-(UPE-PE)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>bloco de volume V = 0,25 m<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span> <\/b>e <\/b><\/span><\/span><\/span>massa 0,05 kg <\/b><\/span><\/span><\/span>est\u00e1 <\/b><\/span><\/span><\/span>preso a um fio ideal <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>completamente imerso <\/b><\/span><\/span><\/span>em <\/b><\/span><\/span><\/span>um l\u00edquido de densidade \u03c1 = 400 kg\/m<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>\u00a0<\/b><\/span><\/span><\/span>contido em <\/b><\/span><\/span><\/span>uma caixa selada, conforme ilustra a figura.<\/b><\/span><\/span><\/span><\/p>\n

Sabendo-se que a <\/b><\/span><\/span><\/span>tens\u00e3o no fio nessa situa\u00e7\u00e3o \u00e9 igual a 89,5 N, <\/b><\/span><\/span><\/span>determine o <\/b><\/span><\/span><\/span>m\u00f3dulo da rea\u00e7\u00e3o normal da superf\u00edcie superior da caixa sobre o bloco.<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>0,0 N <\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>89,0 N <\/b><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span>910,0 N <\/b><\/span><\/span><\/span><\/p>\n

d) <\/b><\/span><\/span><\/span>910,5 N <\/b><\/span><\/span><\/span><\/p>\n

e) <\/b><\/span><\/span><\/span>1000,0 N<\/b><\/span><\/span><\/span><\/p>\n

09-(PUC-SP)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Uma <\/b><\/span><\/span><\/span>esfera oca de alum\u00ednio tem massa de 50g e volume de 30cm<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>volume da parte vazia \u00e9 de 10cm<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>. <\/b><\/span><\/span><\/span>Pede-se:<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>a densidade da esfera<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>a massa espec\u00edfica do alum\u00ednio<\/b><\/span><\/span><\/span><\/p>\n

10-(CEFET-MG)\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0 <\/b><\/span><\/span><\/span>figura 1 representa quatro barras met\u00e1licas maci\u00e7as de mesmo volume.<\/b><\/span><\/span><\/span><\/p>\n

Essas <\/b><\/span><\/span><\/span>barras foram fundidas<\/b><\/span><\/span><\/span> e, <\/b><\/span><\/span><\/span>parcelas iguais de suas massas, <\/b><\/span><\/span><\/span>usadas na <\/b><\/span><\/span><\/span>constru\u00e7\u00e3o de novas barras maci\u00e7as A, B, C, D, mais finas e de di\u00e2metros id\u00eanticos, <\/b><\/span><\/span><\/span>mostradas na <\/b><\/span><\/span><\/span>figura 2.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Os <\/b><\/span><\/span><\/span>metais 1, 2, 3 e 4 foram usados<\/b><\/span><\/span><\/span>, respectivamente, <\/b><\/span><\/span><\/span>na fabrica\u00e7\u00e3o das barras<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>C, A, B, D.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span>b) <\/b><\/span><\/span><\/span>C, B, A, D.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span>c) <\/b><\/span><\/span><\/span>B, D, C, A.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span>\u00a0d) <\/b><\/span><\/span><\/span>A, D, B, C.<\/b><\/span><\/span><\/span><\/p>\n

11-(ENEM-MEC) \u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Pelas <\/b><\/span><\/span><\/span>normas vigentes, o litro do \u00e1lcool hidratado <\/b><\/span><\/span><\/span>que abastece os ve\u00edculos <\/b><\/span><\/span><\/span>deve<\/b><\/span><\/span><\/span> ser <\/b><\/span><\/span><\/span>constitu\u00eddo de 96% de \u00e1lcool puro e 4% de \u00e1gua(em volume).<\/b><\/span><\/span><\/span>\"\"<\/p>\n

As <\/b><\/span><\/span><\/span>densidades <\/b><\/span><\/span><\/span>desses componentes <\/b><\/span><\/span><\/span>s\u00e3o dad<\/b><\/span><\/span><\/span>os a seguir. <\/b><\/span><\/span><\/span><\/p>\n

\u00c1gua <\/b><\/span><\/span><\/span>= 1000 g\/L\u00a0\u00a0 <\/b><\/span><\/span><\/span>\u00e1lcool <\/b><\/span><\/span><\/span>= 800g\/L<\/b><\/span><\/span><\/span><\/p>\n

Um <\/b><\/span><\/span><\/span>t\u00e9cnico<\/b><\/span><\/span><\/span> de um <\/b><\/span><\/span><\/span>\u00f3rg\u00e3o de defesa do consumidor inspecionou cinco postos suspeitos <\/b><\/span><\/span><\/span>de venderem <\/b><\/span><\/span><\/span>\u00e1lcool hidratado fora das normas. <\/b><\/span><\/span><\/span><\/p>\n

Colheu,<\/b><\/span><\/span><\/span> ent\u00e3o uma <\/b><\/span><\/span><\/span>amostra do produto de cada posto e mediu a densidade de cada uma delas. <\/b><\/span><\/span><\/span><\/p>\n

Obteve os seguintes\u00a0<\/b><\/span><\/span><\/span>reusltados:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>partir desses dados,<\/b><\/span><\/span><\/span> o t\u00e9cnico <\/b><\/span><\/span><\/span>p\u00f4de concluir que estavam com o combust\u00edvel adequado somente os postos<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

12- (UNIFOR-CE)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>corpo s\u00f3lido, <\/b><\/span><\/span><\/span>de <\/b><\/span><\/span><\/span>massa 90 g e volume 100 cm<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>, <\/b><\/span><\/span><\/span>encontra-se no <\/b><\/span><\/span><\/span>fundo de um recipiente de um l\u00edquido de densidade 0,60 g\/cm<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Misturando-se <\/b><\/span><\/span><\/span>um outro <\/b><\/span><\/span><\/span>l\u00edquido de densidade 1,5g\/cm<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>, <\/b><\/span><\/span><\/span>o corpo <\/b><\/span><\/span><\/span>come\u00e7a a flutuar quando a densidade da mistura, em g\/cm<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>, for superior a:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

13-(UNICAMP-SP)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O <\/b><\/span><\/span><\/span>avi\u00e3o <\/b><\/span><\/span><\/span>estabeleceu um <\/b><\/span><\/span><\/span>novo paradigma <\/b><\/span><\/span><\/span>nos <\/b><\/span><\/span><\/span>meios de transporte. <\/b><\/span><\/span><\/span><\/p>\n

Em 1906, <\/b><\/span><\/span><\/span>Alberto Santos-Dumont realizou em Paris um v\u00f4o hist\u00f3rico com o 14 Bis<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>massa <\/b><\/span><\/span><\/span>desse avi\u00e3o, <\/b><\/span><\/span><\/span>incluindo o piloto, <\/b><\/span><\/span><\/span>era de <\/b><\/span><\/span><\/span>300kg,<\/b><\/span><\/span><\/span> e a <\/b><\/span><\/span><\/span>\u00e1rea total das duas asas era de aproximadamente 50m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span><\/span>for\u00e7a<\/b><\/span><\/span><\/span> de <\/b><\/span><\/span><\/span>sustenta\u00e7\u00e3o de um avi\u00e3o, <\/b><\/span><\/span><\/span>dirigida <\/b><\/span><\/span><\/span>verticalmente de baixo para cima, <\/b><\/span><\/span><\/span>resulta da <\/b><\/span><\/span><\/span>diferen\u00e7a <\/b><\/span><\/span><\/span>de <\/b><\/span><\/span><\/span>press\u00e3o entre a parte inferior e a parte superior das asas.<\/b><\/span><\/span><\/span>\"\"<\/p>\n

O <\/b><\/span><\/span><\/span>gr\u00e1fico representa, <\/b><\/span><\/span><\/span>de forma simplificada, o <\/b><\/span><\/span><\/span>m\u00f3dulo da for\u00e7a de sustenta\u00e7\u00e3o aplicada ao 14 Bis em fun\u00e7\u00e3o do tempo, durante a parte inicial do v\u00f4o.<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>Em <\/b><\/span><\/span><\/span>que instante a aeronave decola<\/b><\/span><\/span><\/span>, ou seja, <\/b><\/span><\/span><\/span>perde contato com o ch\u00e3o?<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>Qual \u00e9 a <\/b><\/span><\/span><\/span>diferen\u00e7a de press\u00e3o entre a parte inferior e a parte superior das asas, \u0394P = P<\/b><\/span><\/span><\/span>(inf)<\/b><\/span><\/span><\/sub><\/span> \u2013 P<\/b><\/span><\/span><\/span>(sup)<\/b><\/span><\/span><\/sub><\/span> , no instante t = 20s? (<\/b><\/span><\/span><\/span>g <\/b><\/span><\/span><\/span>= 10 ms<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>)<\/b><\/span><\/span><\/span><\/p>\n

14-(UFPR-PR)<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

Quatro cubos met\u00e1licos homog\u00eaneos<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span><\/span>iguais, de aresta 10<\/b><\/span><\/span><\/span>-1<\/b><\/span><\/span><\/sup><\/span>m, acham-se dispostos sobre um plano.<\/b><\/span><\/span><\/span><\/p>\n

Sabe-se que a <\/b><\/span><\/span><\/span>press\u00e3o aplicada pelo conjunto sobre um plano \u00e9 10<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>\u00a0N\/m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>. <\/b><\/span><\/span><\/span>Adotando <\/b><\/span><\/span><\/span>g = 10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>, calcule<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>densidade dos cubos.<\/b><\/span><\/span><\/span><\/p>\n

15-(UFRJ-RJ)\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma <\/b><\/span><\/span><\/span>ventosa comercial \u00e9 constitu\u00edda por uma c\u00e2mara r\u00edgida que fica totalmente vedada em contato com uma placa, mantendo o ar em seu interior a uma press\u00e3o\u00a0P<\/b><\/span><\/span><\/span>int<\/b><\/span><\/span><\/sub><\/span>\u00a0= 0,95×10<\/b><\/span><\/span><\/span>5<\/b><\/span><\/span><\/sup><\/span>\u00a0N\/m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>. <\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span><\/span>placa est\u00e1 suspensa na horizontal pela ventosa <\/b><\/span><\/span><\/span>e ambas est\u00e3o no <\/b><\/span><\/span><\/span>ambiente \u00e0 press\u00e3o atmosf\u00e9rica usual,\u00a0P<\/b><\/span><\/span><\/span>atm<\/b><\/span><\/span><\/sub><\/span>\u00a0= 1,00×10<\/b><\/span><\/span><\/span>5<\/b><\/span><\/span><\/sup><\/span>\u00a0N\/m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>, como indicado nas figuras a seguir.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

A <\/b><\/span><\/span><\/span>\u00e1rea de contato A entre o ar dentro da c\u00e2mara e a placa \u00e9 de 0,10 m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>. <\/b><\/span><\/span><\/span>A <\/b><\/span><\/span><\/span>parede da c\u00e2mara <\/b><\/span><\/span><\/span>tem <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0<\/span><\/p>\n

espessura desprez\u00edvel, o peso da placa \u00e9 40N<\/b><\/span><\/span><\/span> e o <\/b><\/span><\/span><\/span>sistema<\/b><\/span><\/span><\/span> est\u00e1 em <\/b><\/span><\/span><\/span>repouso.<\/b><\/span><\/span><\/span><\/p>\n

Calcule o <\/b><\/span><\/span><\/span>m\u00f3dulo da for\u00e7a vertical de contato entre a placa e as paredes da c\u00e2mara da ventosa.<\/b><\/span><\/span><\/span><\/p>\n

16-(FUVEST-SP)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00c1gua e etanol misturam-se <\/b><\/span><\/span><\/span>completamente, em <\/b><\/span><\/span><\/span>quaisquer propor\u00e7\u00f5es.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

Observa-se que o <\/b><\/span><\/span><\/span>volume final da mistura \u00e9 menor do que a soma dos volumes de etanol e de \u00e1gua empregados para prepar\u00e1-la. <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O <\/b><\/span><\/span><\/span>gr\u00e1fico acima mostra <\/b><\/span><\/span><\/span>como a <\/b><\/span><\/span><\/span>densidade varia em fun\u00e7\u00e3o da porcentagem de etanol (em volume) empregado para preparar a mistura (densidades medidas a 20<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>C).<\/b><\/span><\/span><\/span><\/p>\n

Se <\/b><\/span><\/span><\/span>50 mL de etanol <\/b><\/span><\/span><\/span>forem misturados <\/b><\/span><\/span><\/span>a 50 mL de \u00e1gua, a 20<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>C<\/b><\/span><\/span><\/span>, o <\/b><\/span><\/span><\/span>volume da mistura resultante<\/b><\/span><\/span><\/span>, a essa mesma temperatura, <\/b><\/span><\/span><\/span>ser\u00e1 de, aproximadamente,<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

17-(UFMG-MG)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>reservat\u00f3rio de \u00e1gua \u00e9 constitu\u00eddo de duas partes cil\u00edndricas, interligadas,<\/b><\/span><\/span><\/span> como mostrado na <\/b><\/span><\/span><\/span>figura.<\/b><\/span><\/span><\/span>\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>\u00e1rea da se\u00e7\u00e3o reta do cilindro inferior \u00e9 maior que a do cilindro superior.<\/b><\/span><\/span><\/span><\/p>\n

Inicialmente,<\/b><\/span><\/span><\/span> esse reservat\u00f3rio <\/b><\/span><\/span><\/span>est\u00e1 vazio. <\/b><\/span><\/span><\/span><\/p>\n

Em certo instante, <\/b><\/span><\/span><\/span>come\u00e7a-se a ench\u00ea-lo com \u00e1gua, mantendo-se uma vaz\u00e3o constante.<\/b><\/span><\/span><\/span><\/p>\n

Assinale a <\/b><\/span><\/span><\/span>alternativa cujo gr\u00e1fico MELHOR representa a press\u00e3o, <\/b><\/span><\/span><\/span>no <\/b><\/span><\/span><\/span>fundo do reservat\u00f3rio, <\/b><\/span><\/span><\/span>em <\/b><\/span><\/span><\/span>fun\u00e7\u00e3o do tempo,<\/b><\/span><\/span><\/span> <\/b>desde o instante <\/b><\/span><\/span><\/span>em que se come\u00e7a a <\/b><\/span><\/span><\/span>ench\u00ea-lo at\u00e9 o instante em que ele come\u00e7a a transbordar.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

18-(UNESP-SP)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Para que se <\/b><\/span><\/span><\/span>administre medicamento via endovenosa, <\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/span>frasco<\/b><\/span><\/span><\/span> deve ser <\/b><\/span><\/span><\/span>colocado a uma certa altura acima do ponto de aplica\u00e7\u00e3o no paciente. <\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>frasco fica suspenso <\/b><\/span><\/span><\/span>em um <\/b><\/span><\/span><\/span>suporte vertical com pontos de fixa\u00e7\u00e3o de altura vari\u00e1vel <\/b><\/span><\/span><\/span>e se <\/b><\/span><\/span><\/span>conecta <\/b><\/span><\/span><\/span>ao <\/b><\/span><\/span><\/span>paciente por um cateter, por onde desce o medicamento.<\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span><\/span>press\u00e3o na superf\u00edcie livre \u00e9 a press\u00e3o atmosf\u00e9rica; <\/b><\/span><\/span><\/span>no <\/b><\/span><\/span><\/span>ponto de aplica\u00e7\u00e3o no paciente, <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>press\u00e3o <\/b><\/span><\/span><\/span>deve ter um <\/b><\/span><\/span><\/span>valor maior do que a atmosf\u00e9rica. <\/b><\/span><\/span><\/span>\"\"<\/p>\n

Considere que <\/b><\/span><\/span><\/span>dois medicamentos diferentes precisam ser administrados. <\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>frasco do primeiro foi colocado em uma posi\u00e7\u00e3o tal que a superf\u00edcie livre do l\u00edquido encontra-se a uma altura h do ponto de aplica\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

Para <\/b><\/span><\/span><\/span>aplica\u00e7\u00e3o do segundo medicamento, de massa espec\u00edfica 1,2 vezes maior que a do anterior<\/b><\/span><\/span><\/span>, a <\/b><\/span><\/span><\/span>altura de fixa\u00e7\u00e3o do frasco deve ser outra. <\/b><\/span><\/span><\/span>Tomando <\/b><\/span><\/span><\/span>h como refer\u00eancia, <\/b><\/span><\/span><\/span>para a <\/b><\/span><\/span><\/span>aplica\u00e7\u00e3o do segundo medicamento <\/b><\/span><\/span><\/span>deve – se<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>diminuir a altura de h\/5.\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>diminuir a altura de h\/6.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span>aumentar a altura de h\/5.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

d) <\/b><\/span><\/span><\/span>aumentar a altura de 2h\/5.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

e) <\/b><\/span><\/span><\/span>aumentar a altura de h\/6.<\/b><\/span><\/span><\/span><\/p>\n

19-(UFAL-AL)\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma <\/b><\/span><\/span><\/span>torneira aberta derrama \u00e1gua \u00e0 vaz\u00e3o constante de 100 mL por segundo <\/b><\/span><\/span><\/span>numa <\/b><\/span><\/span><\/span>caixa d\u2019\u00e1gua c\u00fabica de volume 1 m<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>, inicialmente vazia. <\/b><\/span><\/span><\/span>\"\"<\/p>\n

Ap\u00f3s algum tempo, a <\/b><\/span><\/span><\/span>torneira \u00e9 fechada, <\/b><\/span><\/span><\/span>e a <\/b><\/span><\/span><\/span>press\u00e3o medida no fundo da caixa,<\/b><\/span><\/span><\/span> devido \u00e0 <\/b><\/span><\/span><\/span>\u00e1gua derramada, \u00e9 igual a 10<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>\u00a0Pa. <\/b><\/span><\/span><\/span><\/p>\n

Considere a <\/b><\/span><\/span><\/span>densidade da \u00e1gua e a acelera\u00e7\u00e3o da gravidade respectivamente iguais a 1 kg\/L e 10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

Durante <\/b><\/span><\/span><\/span>quanto tempo, em segundos,<\/b><\/span><\/span><\/span> a torneira <\/b><\/span><\/span><\/span>permaneceu aberta?<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>10<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>10<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sup><\/span>\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span>10<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

d) <\/b><\/span><\/span><\/span>10<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

e) <\/b><\/span><\/span><\/span>10<\/b><\/span><\/span><\/span>4<\/b><\/span><\/span><\/sup><\/span>\u00a0<\/b><\/span><\/span><\/span><\/p>\n

20-(ENEM-MEC)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um tipo de <\/b><\/span><\/span><\/span>vaso sanit\u00e1rio <\/b><\/span><\/span><\/span>que vem <\/b><\/span><\/span><\/span>substituindo as v\u00e1lvulas de descarga <\/b><\/span><\/span><\/span>est\u00e1 <\/b><\/span><\/span><\/span>esquematizado<\/b><\/span><\/span><\/span> na figura. <\/b><\/span><\/span><\/span><\/p>\n

Ao <\/b><\/span><\/span><\/span>acionar a alavanca, toda<\/b><\/span><\/span><\/span> a \u00e1gua do tanque \u00e9 <\/b><\/span><\/span><\/span>escoada e aumenta o n\u00edvel no vaso, <\/b><\/span><\/span><\/span>at\u00e9 <\/b><\/span><\/span><\/span>cobrir o sif\u00e3o.<\/b><\/span><\/span><\/span> De acordo com o <\/b><\/span><\/span><\/span>Teorema de\u00a0Stevin, <\/b><\/span><\/span><\/span>quanto <\/b><\/span><\/span><\/span>maior a profundidade, maior a press\u00e3o. <\/b><\/span><\/span><\/span>Assim, a <\/b><\/span><\/span><\/span>\u00e1gua desce levando os rejeitos at\u00e9 o sistema de esgoto.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>v\u00e1lvula da caixa da descarga <\/b><\/span><\/span><\/span>se <\/b><\/span><\/span><\/span>fecha e ocorre o seu enchimento.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

Em rela\u00e7\u00e3o <\/b><\/span><\/span><\/span>\u00e0s <\/b><\/span><\/span><\/span>v\u00e1lvulas de descarga, <\/b><\/span><\/span><\/span>esse <\/b><\/span><\/span><\/span>tipo de sistema proporciona maior economia de \u00e1gua.<\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span><\/span>caracter\u00edstica\u00a0 de funcionamento que garante essa economia \u00e9 devida<\/b><\/span><\/span><\/span><\/p>\n

A) <\/b><\/span><\/span><\/span>\u00e0 altura do sif\u00e3o de \u00e1gua.<\/b><\/span><\/span><\/span><\/p>\n

B) <\/b><\/span><\/span><\/span>ao volume do tanque de \u00e1gua.<\/b><\/span><\/span><\/span><\/p>\n

C) <\/b><\/span><\/span><\/span>\u00e0 altura do n\u00edvel de \u00e1gua no vaso.<\/b><\/span><\/span><\/span><\/p>\n

D) <\/b><\/span><\/span><\/span>ao di\u00e2metro do distribuidor de \u00e1gua.<\/b><\/span><\/span><\/span><\/p>\n

E) <\/b><\/span><\/span><\/span>\u00e0 efici\u00eancia da v\u00e1lvula de enchimento do tanque.<\/b><\/span><\/span><\/span><\/p>\n

21-(UEG-GO)<\/b><\/span><\/span><\/span> <\/b>Uma maneira de <\/b><\/span><\/span><\/span>observar a press\u00e3o exercida por uma “coluna de l\u00edquido” <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>efetuar orif\u00edcios numa garrafa pl\u00e1stica de dois litros <\/b><\/span><\/span><\/span>(como as de refrigerante) e <\/b><\/span><\/span><\/span>ench\u00ea-las de \u00e1gua.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

A seguir, s\u00e3o <\/b><\/span><\/span><\/span>apresentadas tr\u00eas situa\u00e7\u00f5es experimentais bem simples.<\/b><\/span><\/span><\/span>\"\"<\/p>\n

Tendo em vista <\/b><\/span><\/span><\/span>as informa\u00e7\u00f5es apresentadas, \u00e9 INCORRETO <\/b><\/span><\/span><\/span>afirmar:<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>Na <\/b><\/span><\/span><\/span>situa\u00e7\u00e3o (I), <\/b><\/span><\/span><\/span>com a garrafa <\/b><\/span><\/span><\/span>tampada, a \u00e1gua n\u00e3o escoar\u00e1, <\/b><\/span><\/span><\/span>enquanto com <\/b><\/span><\/span><\/span>a garrafa aberta a \u00e1gua jorrar\u00e1 pelo orif\u00edcio.<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>Na <\/b><\/span><\/span><\/span>situa\u00e7\u00e3o (II), <\/b><\/span><\/span><\/span>com a <\/b><\/span><\/span><\/span>boca da garrafa totalmente tampada,<\/b><\/span><\/span><\/span> a \u00e1gua <\/b><\/span><\/span><\/span>n\u00e3o escoar\u00e1 pelos orif\u00edcios, por\u00e9m, retirando-se a tampa, a \u00e1gua jorrar\u00e1 pelos dois orif\u00edcios.<\/b><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span>Na <\/b><\/span><\/span><\/span>situa\u00e7\u00e3o (III), <\/b><\/span><\/span><\/span>com a <\/b><\/span><\/span><\/span>garrafa aberta, a \u00e1gua jorrar\u00e1 com menor velocidade pelo orif\u00edcio superior do que pelo orif\u00edcio inferior.<\/b><\/span><\/span><\/span><\/p>\n

d) <\/b><\/span><\/span><\/span>Na <\/b><\/span><\/span><\/span>situa\u00e7\u00e3o (III), tampando-se a boca da garrafa, <\/b><\/span><\/span><\/span>a \u00e1gua <\/b><\/span><\/span><\/span>jorrar\u00e1 apenas pelo orif\u00edcio superior.<\/b><\/span><\/span><\/span><\/p>\n

22-(UFRJ-RJ)<\/b><\/span><\/span><\/span> Arist\u00f3teles acreditava <\/b><\/span><\/span><\/span>que a <\/b><\/span><\/span><\/span>natureza tinha horror ao v\u00e1cuo. <\/b><\/span><\/span><\/span><\/p>\n

Assim, segundo Arist\u00f3teles, <\/b><\/span><\/span><\/span>num tubo como o da figura, onde se produzisse o v\u00e1cuo <\/b><\/span><\/span><\/span>pela <\/b><\/span><\/span><\/span>eleva\u00e7\u00e3o <\/b><\/span><\/span><\/span>de um <\/b><\/span><\/span><\/span>\u00eambolo, a \u00e1gua subiria at\u00e9 preencher totalmente o espa\u00e7o vazio.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

S\u00e9culos mais tarde, ao construir os <\/b><\/span><\/span><\/span>chafarizes de Floren\u00e7a,os florentinos descobriram que a \u00e1gua<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

recusava-se a subir, por suc\u00e7\u00e3o mais do que 10 metros. <\/b><\/span><\/span><\/span><\/p>\n

Perplexos, os construtores <\/b><\/span><\/span><\/span>pediram a Galileu que explicasse esse fen\u00f4meno.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

Ap\u00f3s brincar dizendo que talvez a <\/b><\/span><\/span><\/span>Natureza n\u00e3o abominasse mais o v\u00e1cuo acima de 10 metros, Galileu sugeriu que Torricelli e Viviani, <\/b><\/span><\/span><\/span>ent\u00e3o seus alunos, <\/b><\/span><\/span><\/span>obtivessem a explica\u00e7\u00e3o; <\/b><\/span><\/span><\/span>como sabemos, <\/b><\/span><\/span><\/span>eles conseguiram.<\/b><\/span><\/span><\/span><\/p>\n

Com os <\/b><\/span><\/span><\/span>conhecimentos de hoje, explique porque a \u00e1gua recusou-se a subir mais que 10 metros.<\/b><\/span><\/span><\/span><\/p>\n

23-(UNESP-SP)<\/b><\/span><\/span><\/span> <\/b>Uma pessoa, com o <\/b><\/span><\/span><\/span>objetivo de medir a press\u00e3o interna de um botij\u00e3o de g\u00e1s<\/b><\/span><\/span><\/span> contendo butano, <\/b><\/span><\/span><\/span>conecta \u00e0 v\u00e1lvula do botij\u00e3o um man\u00f4metro em forma de U, <\/b><\/span><\/span><\/span>contendo <\/b><\/span><\/span><\/span>merc\u00fario.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

Ao <\/b><\/span><\/span><\/span>abrir o registro R, <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>press\u00e3o do g\u00e1s provoca um desn\u00edvel de merc\u00fario <\/b><\/span><\/span><\/span>no tubo, como ilustrado na figura. Considere a <\/b><\/span><\/span><\/span>press\u00e3o atmosf\u00e9rica dada por 10<\/b><\/span><\/span><\/span>5<\/b><\/span><\/span><\/sup><\/span>\u00a0Pa, o desn\u00edvel h = 104 cm de Hg e a sec\u00e7\u00e3o do tubo 2 cm<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span>\"\"<\/p>\n

Adotando a <\/b><\/span><\/span><\/span>massa espec\u00edfica do merc\u00fario igual a 13,6 g\/cm<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>\u00a0e g = 10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>, <\/b><\/span><\/span><\/span>calcule<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>press\u00e3o<\/b><\/span><\/span><\/span> do g\u00e1s, em <\/b><\/span><\/span><\/span>pascal.<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>for\u00e7a que o g\u00e1s <\/b><\/span><\/span><\/span>aplica na <\/b><\/span><\/span><\/span>superf\u00edcie do merc\u00fario <\/b><\/span><\/span><\/span>em A.<\/b><\/span><\/span><\/span><\/p>\n

(Advert\u00eancia:<\/b><\/span><\/span><\/span> este experimento \u00e9 perigoso. <\/b><\/span><\/span><\/span>N\u00e3o tente realiz\u00e1-lo.)<\/b><\/span><\/span><\/span><\/p>\n

24-(FUVEST-SP)<\/b><\/span><\/span><\/span> <\/b>Um <\/b><\/span><\/span><\/span>tanque industrial, cil\u00edndrico, <\/b><\/span><\/span><\/span>com <\/b><\/span><\/span><\/span>altura total H<\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/sub><\/span>= 6,0m, <\/b><\/span><\/span><\/span>cont\u00e9m em <\/b><\/span><\/span><\/span>seu interior \u00e1gua at\u00e9 uma altura\u00a0h<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>, a uma temperatura de 27\u00b0C (300 K).<\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>tanque possui um pequeno orif\u00edcio A<\/b><\/span><\/span><\/span> e, portanto, <\/b><\/span><\/span><\/span>est\u00e1 \u00e0 press\u00e3o atmosf\u00e9rica\u00a0P<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>, <\/b><\/span><\/span><\/span>como <\/b><\/span><\/span><\/span>esquematizado em I. <\/b><\/span><\/span><\/span><\/p>\n

No <\/b><\/span><\/span><\/span>procedimento seguinte, <\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/span>orif\u00edcio \u00e9 fechado, <\/b><\/span><\/span><\/span>sendo o <\/b><\/span><\/span><\/span>tanque invertido e aquecido at\u00e9 87\u00b0C (360 K).<\/b><\/span><\/span><\/span>\"\"<\/p>\n

Quando o <\/b><\/span><\/span><\/span>orif\u00edcio \u00e9 reaberto, <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>mantida<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>temperatura do tanque, parte da \u00e1gua escoa, <\/b><\/span><\/span><\/span>at\u00e9 que as <\/b><\/span><\/span><\/span>press\u00f5es no orif\u00edcio se equilibrem, <\/b><\/span><\/span><\/span>restando no <\/b><\/span><\/span><\/span>interior do tanque uma altura h<\/b><\/span><\/span><\/span>1 <\/b><\/span><\/span><\/sub><\/span>= 2,0 m de \u00e1gua, como em II.<\/b><\/span><\/span><\/span><\/p>\n

Determine<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>press\u00e3o P<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>, em N\/m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>,<\/b><\/span><\/span><\/span> no <\/b><\/span><\/span><\/span>interior do tanque, na situa\u00e7\u00e3o II.<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>altura inicial\u00a0h<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\u00a0<\/b><\/span><\/span><\/span>da \u00e1gua no tanque, <\/b><\/span><\/span><\/span>em metros, na situa\u00e7\u00e3o I.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

25-(CPS-SP)<\/b><\/span><\/span><\/span> No <\/b><\/span><\/span><\/span>in\u00edcio do s\u00e9culo XX, <\/b><\/span><\/span><\/span>a ind\u00fastria e o com\u00e9rcio da cidade de S\u00e3o Paulo possibilitaram <\/b><\/span><\/span><\/span>uma qualidade de vida melhor para seus habitantes. <\/b><\/span><\/span><\/span><\/p>\n

Um dos <\/b><\/span><\/span><\/span>h\u00e1bitos saud\u00e1veis, <\/b><\/span><\/span><\/span>ligados \u00e0 <\/b><\/span><\/span><\/span>higieniza\u00e7\u00e3o bucal, <\/b><\/span><\/span><\/span>foi a <\/b><\/span><\/span><\/span>utiliza\u00e7\u00e3o de tubos de pasta dental <\/b><\/span><\/span><\/span>e as <\/b><\/span><\/span><\/span>respectivas escovas de dente.<\/b><\/span><\/span><\/span><\/p>\n

Considerando um <\/b><\/span><\/span><\/span>tubo contendo pasta dental de densidade homog\u00eanea, <\/b><\/span><\/span><\/span>uma pessoa resolve <\/b><\/span><\/span><\/span>apert\u00e1-lo. <\/b><\/span><\/span><\/span>\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>press\u00e3o exercida sobre a pasta, dentro do tubo, <\/b><\/span><\/span><\/span>ser\u00e1:<\/b><\/span><\/span><\/span><\/p>\n

a) maior no fundo <\/b><\/span><\/span><\/span>do tubo, se <\/b><\/span><\/span><\/span>apertar no fundo.\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

b) menor no fundo <\/b><\/span><\/span><\/span>do tubo, se <\/b><\/span><\/span><\/span>apertar perto do bico de sa\u00edda.<\/b><\/span><\/span><\/span><\/p>\n

c) maior no meio <\/b><\/span><\/span><\/span>do tubo, <\/b><\/span><\/span><\/span>se apertar no meio.\u00a0<\/b><\/span><\/span><\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

d) menor no fundo <\/b><\/span><\/span><\/span>do tubo, se <\/b><\/span><\/span><\/span>apertar no meio.<\/b><\/span><\/span><\/span><\/p>\n

e) igual em todos os pontos<\/b><\/span><\/span><\/span>, qualquer que <\/b><\/span><\/span><\/span>seja o local apertado.<\/b><\/span><\/span><\/span><\/p>\n

26-(MACKENZIE-SP)<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

O <\/b><\/span><\/span><\/span>diagrama da figura <\/b><\/span><\/span><\/span>mostra o <\/b><\/span><\/span><\/span>principio do sistema hidr\u00e1ulico <\/b><\/span><\/span><\/span>do <\/b><\/span><\/span><\/span>freio<\/b><\/span><\/span><\/span> de um <\/b><\/span><\/span><\/span>autom\u00f3vel.<\/b><\/span><\/span><\/span><\/p>\n

Quando uma <\/b><\/span><\/span><\/span>for\u00e7a de 50N <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>exercida no pedal, <\/b><\/span><\/span><\/span>qual a <\/b><\/span><\/span><\/span>for\u00e7a aplicada pelo \u00eambolo de 80mm\u00b2 de \u00e1rea?<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>100N\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>200N\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span>300N\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

d) <\/b><\/span><\/span><\/span>400N\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

e) <\/b><\/span><\/span><\/span>500N<\/b><\/span><\/span><\/span><\/p>\n

27-(UFRN-RN)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Do ponto de vista da <\/b><\/span><\/span><\/span>F\u00edsica,<\/b><\/span><\/span><\/span> o <\/b><\/span><\/span><\/span>sistema de freios dos carros atuais <\/b><\/span><\/span><\/span>\u00e9 formado por uma <\/b><\/span><\/span><\/span>alavanca <\/b><\/span><\/span><\/span>e por uma <\/b><\/span><\/span><\/span>prensa hidr\u00e1ulica.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

Enquanto a <\/b><\/span><\/span><\/span>alavanca tem a capacidade\u00a0 de amplia\u00e7\u00e3o da for\u00e7a aplicada <\/b><\/span><\/span><\/span>por um <\/b><\/span><\/span><\/span>fator igual \u00e0 raz\u00e3o direta de seus bra\u00e7os, <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>prensa hidr\u00e1ulica amplia a for\u00e7a da alavanca na raz\u00e3o direta de suas \u00e1reas. <\/b><\/span><\/span><\/span>Finalmente, a <\/b><\/span><\/span><\/span>for\u00e7a resultante aciona os freios, conforme mostrado na figura, fazendo o<\/b><\/span><\/span><\/span><\/p>\n

ve\u00edculo parar.<\/b><\/span><\/span><\/span>\"\"<\/p>\n

Considere que a <\/b><\/span><\/span><\/span>alavanca tem bra\u00e7o maior,\u00a0 L, igual a 40cm e bra\u00e7o menor , l, igual a 10cm,<\/b><\/span><\/span><\/span> e a <\/b><\/span><\/span><\/span>prensa hidr\u00e1ulica apresenta \u00eambolos com \u00e1rea maior, A, oito vezes maior que a \u00e1rea menor, a. <\/b><\/span><\/span><\/span>Levando em <\/b><\/span><\/span><\/span>considera\u00e7\u00e3o as caracter\u00edsticas descritas\u00a0 acima, <\/b><\/span><\/span><\/span>tal <\/b><\/span><\/span><\/span>sistema de freios \u00e9 capaz de fazer <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>for\u00e7a exercida no pedal dos freios,<\/b><\/span><\/span><\/span> pelo motorista, <\/b><\/span><\/span><\/span>aumentar<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

28-(FUVEST-SP)<\/b><\/span><\/span><\/span><\/span> <\/b>Um <\/b><\/span><\/span><\/span><\/span>recipiente cil\u00edndrico vazio flutua em um tanque de \u00e1gua com parte de seu volume submerso, <\/b><\/span><\/span><\/span><\/span>como na <\/b><\/span><\/span><\/span><\/span>figura (fig. 1). <\/b><\/span><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span><\/span>recipiente possui marcas graduadas igualmente espa\u00e7adas, paredes laterais <\/b><\/span><\/span><\/span><\/span>de <\/b><\/span><\/span><\/span><\/span>volume<\/b><\/span><\/span><\/span><\/span> <\/b>desprez\u00edvel e um fundo grosso e pesado.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Quando o <\/b><\/span><\/span><\/span><\/span>recipiente come\u00e7a a ser preenchido, <\/b><\/span><\/span><\/span><\/span>lentamente, <\/b><\/span><\/span><\/span><\/span>com \u00e1gua,<\/b><\/span><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span><\/span>altura m\u00e1xima que a \u00e1gua pode atingir em seu interior, sem<\/b><\/span><\/span><\/span><\/span> que ele <\/b><\/span><\/span><\/span><\/span>afunde totalmente, \u00e9 melhor representada <\/b><\/span><\/span><\/span><\/span>por<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

29-(UFSM-RS) <\/b><\/span><\/span><\/span><\/span>A <\/b><\/span><\/span><\/span><\/span>posi\u00e7\u00e3o dos peixes \u00f3sseos <\/b><\/span><\/span><\/span><\/span>e seu <\/b><\/span><\/span><\/span><\/span>equil\u00edbrio na \u00e1gua <\/b><\/span><\/span><\/span><\/span>s\u00e3o mantidos, <\/b><\/span><\/span><\/span><\/span>fundamentalmente, <\/b><\/span><\/span><\/span><\/span>pela<\/b><\/span><\/span><\/span><\/span> bexiga<\/b><\/span><\/span><\/span><\/span>\"\"<\/p>\n

natat\u00f3ria que eles possuem.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Regulando a <\/b><\/span><\/span><\/span><\/span>quantidade de g\u00e1s nesse \u00f3rg\u00e3o, <\/b><\/span><\/span><\/span><\/span>o <\/b><\/span><\/span><\/span><\/span>peixe se situa mais ou menos elevado no meio aqu\u00e1tico.<\/b><\/span><\/span><\/span><\/span><\/p>\n

“Para <\/b><\/span><\/span><\/span><\/span>_______________ a <\/b><\/span><\/span><\/span><\/span>profundidade, os peixes <\/b><\/span><\/span><\/span><\/span>______________ a <\/b><\/span><\/span><\/span><\/span>bexiga natat\u00f3ria <\/b><\/span><\/span><\/span><\/span>e, <\/b><\/span><\/span><\/span><\/span>com isso, <\/b><\/span><\/span><\/span><\/span>_______________ a <\/b><\/span><\/span><\/span><\/span>sua densidade.”<\/b><\/span><\/span><\/span><\/span><\/p>\n

Selecione a <\/b><\/span><\/span><\/span><\/span>alternativa que preenche corretamente as lacunas.<\/b><\/span><\/span><\/span><\/span><\/p>\n

a) aumentar – desinflam \u2013 aumentam\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span><\/span>aumentar – inflam \u2013 diminuem\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span><\/span>diminuir – inflam – aumentam<\/b><\/span><\/span><\/span><\/span><\/p>\n

d) <\/b><\/span><\/span><\/span><\/span>diminuir – desinflam \u2013 diminuem\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

e) <\/b><\/span><\/span><\/span><\/span>aumentar – desinflam \u2013 diminuem<\/b><\/span><\/span><\/span><\/span><\/p>\n

30<\/b><\/span><\/span><\/span>-(UFSM-RS)<\/b><\/span><\/span><\/span><\/span> Na Figura (I), <\/b><\/span><\/span><\/span><\/span>um <\/b><\/span><\/span><\/span><\/span>recipiente com \u00e1gua est\u00e1 sobre uma balan\u00e7a que marca um certo valor P <\/b><\/span><\/span><\/span><\/span>para o <\/b><\/span><\/span><\/span><\/span>peso do conjunto (\u00e1gua + recipiente). <\/b><\/span><\/span><\/span><\/span><\/p>\n

Coloca-se <\/b><\/span><\/span><\/span><\/span>uma <\/b><\/span><\/span><\/span><\/span>esfera de chumbo imersa na \u00e1gua do recipiente suspensa por um fio ideal, como mostra a Figura (II). Assinale a(s) alternativa(s) correta(s).<\/b><\/span><\/span><\/span><\/span><\/p>\n

(01) <\/b><\/span><\/span><\/span><\/span>Na situa\u00e7\u00e3o da <\/b><\/span><\/span><\/span><\/span>Figura (II), <\/b><\/span><\/span><\/span><\/span>a balan\u00e7a marca um peso P mais o peso da esfera de chumbo.<\/b><\/span><\/span><\/span><\/span>\"\"<\/p>\n

(02) <\/b><\/span><\/span><\/span><\/span>Na situa\u00e7\u00e3o da <\/b><\/span><\/span><\/span><\/span>Figura (II), <\/b><\/span><\/span><\/span><\/span>a balan\u00e7a marca um peso igual a P.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(04) <\/b><\/span><\/span><\/span><\/span>Na situa\u00e7\u00e3o da <\/b><\/span><\/span><\/span><\/span>Figura (II), <\/b><\/span><\/span><\/span><\/span>a balan\u00e7a marca um peso P mais o peso da \u00e1gua deslocada pela esfera de chumbo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(08) <\/b><\/span><\/span><\/span><\/span>Na situa\u00e7\u00e3o da <\/b><\/span><\/span><\/span><\/span>Figura (II), <\/b><\/span><\/span><\/span><\/span>a balan\u00e7a marca um peso igual a P mais o peso da esfera de chumbo menos a tens\u00e3o do fio.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(16) <\/b><\/span><\/span><\/span><\/span>Na situa\u00e7\u00e3o da <\/b><\/span><\/span><\/span><\/span>figura (II),<\/b><\/span><\/span><\/span><\/span> a balan\u00e7a marca um peso igual a P menos a tens\u00e3o do fio.<\/b><\/span><\/span><\/span><\/span><\/p>\n

31-<\/b><\/span><\/span><\/span>(UFPE-PE)<\/b><\/span><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span><\/span>bloco homog\u00eaneo e imperme\u00e1vel, <\/b><\/span><\/span><\/span><\/span>de <\/b><\/span><\/span><\/span><\/span>densidade d = 0,25 g\/cm<\/b><\/span><\/span><\/span><\/span>3<\/b><\/span><\/span><\/span><\/sup><\/span>, <\/b><\/span><\/span><\/span><\/span>est\u00e1 em <\/b><\/span><\/span><\/span><\/span>repouso, imerso em um tanque completamente cheio de \u00e1gua e vedado, <\/b><\/span><\/span><\/span><\/span>como mostrado na <\/b><\/span><\/span><\/span><\/span>figura.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Calcule a <\/b><\/span><\/span><\/span><\/span>raz\u00e3o entre os m\u00f3dulos da for\u00e7a que o bloco exerce na tampa superior do tanque e do peso do bloco.<\/b><\/span><\/span><\/span><\/span><\/p>\n

32-(UNESP-SP)<\/b><\/span><\/span><\/span><\/span> <\/b>A <\/b><\/span><\/span><\/span><\/span>figura\u00a0 representa um recipiente cilindrico vazio flutuando na \u00e1gua, <\/b><\/span><\/span><\/span><\/span>em <\/b><\/span><\/span><\/span><\/span>repouso.<\/b><\/span><\/span><\/span><\/span> A <\/b><\/span><\/span><\/span><\/span>\u00e1rea da base desse cilindro \u00e9 80cm<\/b><\/span><\/span><\/span><\/span>2<\/b><\/span><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

a) <\/b><\/span><\/span><\/span><\/span>Qual a <\/b><\/span><\/span><\/span><\/span>massa desse recipiente?<\/b><\/span><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span><\/span>Suponha que uma <\/b><\/span><\/span><\/span><\/span>estudante coloque, um a um, chumbinhos de pesca iguais, de 12g cada um, dentro desse recipiente, mantendo sua base sempre horizontal.<\/b><\/span><\/span><\/span><\/span> Qual o <\/b><\/span><\/span><\/span><\/span>n\u00famero m\u00e1ximo de chumbinhos que podem ser colocados nesse recipiente sem que ele afunde?<\/b><\/span><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span><\/span>Ultimamente, t\u00eam sido <\/b><\/span><\/span><\/span><\/span>detectados fortes ind\u00edcios de que j\u00e1 houve \u00e1gua no estado l\u00edquido em Marte.\u00a0<\/b><\/span><\/span><\/span><\/span> <\/b><\/p>\n

Se <\/b><\/span><\/span><\/span><\/span>essa experi\u00eancia fosse feita em Marte, <\/b><\/span><\/span><\/span><\/span>seus <\/b><\/span><\/span><\/span><\/span>resultados mudariam? Justifique. <\/b><\/span><\/span><\/span><\/span>Suponha que a <\/b><\/span><\/span><\/span><\/span>densidade e o estado f\u00edsico da \u00e1gua permane\u00e7am inalterados. (Dados: <\/b><\/span><\/span><\/span><\/span>d<\/b><\/span><\/span><\/span><\/span>\u00e1gua <\/b><\/span><\/span><\/span><\/sub><\/span>= 1.000kg\/m<\/b><\/span><\/span><\/span><\/span>3<\/b><\/span><\/span><\/span><\/sup><\/span>; <\/b><\/span><\/span><\/span><\/span>g<\/b><\/span><\/span><\/span><\/span>Terra<\/b><\/span><\/span><\/span><\/sub><\/span> <\/b>= 10 m\/s<\/b><\/span><\/span><\/span><\/span>2<\/b><\/span><\/span><\/span><\/sup><\/span>\u00a0e <\/b><\/span><\/span><\/span><\/span>g<\/b><\/span><\/span><\/span><\/span>Marte<\/b><\/span><\/span><\/span><\/sub><\/span> <\/b>= 3,7 m\/s<\/b><\/span><\/span><\/span><\/span>2<\/b><\/span><\/span><\/span><\/sup><\/span>)<\/b><\/span><\/span><\/span><\/span><\/p>\n

33-(UFRJ-RJ)<\/b><\/span><\/span><\/span><\/span> <\/b>Realizando um <\/b><\/span><\/span><\/span><\/span>experimento caseiro sobre hidrost\u00e1tica <\/b><\/span><\/span><\/span><\/span>para seus alunos, um <\/b><\/span><\/span><\/span><\/span>professor p\u00f4s, sobre uma balan\u00e7a, um recipiente graduado contendo \u00e1gua e um pequeno barco de brinquedo, <\/b><\/span><\/span><\/span><\/span>que nela <\/b><\/span><\/span><\/span><\/span>flutuava em repouso, <\/b><\/span><\/span><\/span><\/span>sem <\/b><\/span><\/span><\/span><\/span>nenhuma quantidade de \u00e1gua em seu interior.\u00a0<\/b><\/span><\/span><\/span><\/span> <\/b><\/p>\n

Nessa situa\u00e7\u00e3o, a <\/b><\/span><\/span><\/span><\/span>turma constatou que a balan\u00e7a indicava uma massa M<\/b><\/span><\/span><\/span><\/span>1<\/b><\/span><\/span><\/span><\/sub><\/span>\u00a0e que a <\/b><\/span><\/span><\/span><\/span>altura da \u00e1gua no recipiente era h<\/b><\/span><\/span><\/span><\/span>1<\/b><\/span><\/span><\/span><\/sub><\/span>. <\/b><\/span><\/span><\/span><\/span>\"\"<\/p>\n

Em <\/b><\/span><\/span><\/span><\/span>dado instante, um aluno mexeu inadvertidamente no barco.<\/b><\/span><\/span><\/span><\/span> O barco <\/b><\/span><\/span><\/span><\/span>encheu de \u00e1gua, <\/b><\/span><\/span><\/span><\/span>foi para o <\/b><\/span><\/span><\/span><\/span>fundo do recipiente e l\u00e1 permaneceu em repouso. <\/b><\/span><\/span><\/span><\/span><\/p>\n

Nessa <\/b><\/span><\/span><\/span><\/span>nova situa\u00e7\u00e3o, a balan\u00e7a indicou uma massa M<\/b><\/span><\/span><\/span><\/span>2<\/b><\/span><\/span><\/span><\/sub><\/span>\u00a0<\/b><\/span><\/span><\/span><\/span>e a <\/b><\/span><\/span><\/span><\/span>medi\u00e7\u00e3o da altura da \u00e1gua foi h<\/b><\/span><\/span><\/span><\/span>2<\/b><\/span><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span><\/span>Indique <\/b><\/span><\/span><\/span><\/span>se M<\/b><\/span><\/span><\/span><\/span>1<\/b><\/span><\/span><\/span><\/sub><\/span>\u00a0\u00e9 maior, menor ou igual a M<\/b><\/span><\/span><\/span><\/span>2<\/b><\/span><\/span><\/span><\/sub><\/span>. <\/b><\/span><\/span><\/span><\/span>Justifique sua resposta.<\/b><\/span><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span><\/span>Indique <\/b><\/span><\/span><\/span><\/span>se h<\/b><\/span><\/span><\/span><\/span>1<\/b><\/span><\/span><\/span><\/sub><\/span>\u00a0\u00e9 maior, menor ou igual a h<\/b><\/span><\/span><\/span><\/span>2<\/b><\/span><\/span><\/span><\/sub><\/span>. <\/b><\/span><\/span><\/span><\/span>Justifique sua resposta.<\/b><\/span><\/span><\/span><\/span><\/p>\n

34-(ITA-SP)<\/b><\/span><\/span><\/span> <\/b>Um <\/b><\/span><\/span><\/span>cubo maci\u00e7o homog\u00eaneo com 4,0 cm de aresta <\/b><\/span><\/span><\/span>flutua na <\/b><\/span><\/span><\/span>\u00e1gua tranquila de uma pequena lagoa, <\/b><\/span><\/span><\/span>de modo a <\/b><\/span><\/span><\/span>manter 70% da \u00e1rea total da sua superf\u00edcie em contato com a \u00e1gua, <\/b><\/span><\/span><\/span>conforme mostra a <\/b><\/span><\/span><\/span>figura.<\/b><\/span><\/span><\/span>\"\"<\/p>\n

A seguir, uma <\/b><\/span><\/span><\/span>pequena r\u00e3 se acomoda no centro da face superior do cubo <\/b><\/span><\/span><\/span>e este se <\/b><\/span><\/span><\/span>afunda mais 0,50 cm na \u00e1gua. <\/b><\/span><\/span><\/span><\/p>\n

Assinale a <\/b><\/span><\/span><\/span>op\u00e7\u00e3o com os valores aproximados da densidade do cubo e da massa da r\u00e3, <\/b><\/span><\/span><\/span>respectivamente.<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>0,20 g\/cm3 e 6,4 g \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>0,70 g\/cm3 e 6,4 g \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span>0,70 g\/cm3 e 8,0 g \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

d) <\/b><\/span><\/span><\/span><\/span>0,80 g\/cm3 e 6,4 g \u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

\u00a0<\/span>35-(UFG-GO)<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

<\/a> Os <\/b><\/span><\/span><\/span>carros modernos utilizam freios a disco <\/b><\/span><\/span><\/span>em <\/b><\/span><\/span><\/span>todas as rodas, <\/b><\/span><\/span><\/span>e o <\/b><\/span><\/span><\/span>acionamento \u00e9 feito por um <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

sistema hidr\u00e1ulico fechado, <\/b><\/span><\/span><\/span>que \u00e9 <\/b><\/span><\/span><\/span>acionado quando o motorista pisa no pedal de freio. <\/b><\/span><\/span><\/span><\/p>\n

Neste sistema, ao mover o pist\u00e3o, <\/b><\/span><\/span><\/span>as <\/b><\/span><\/span><\/span>pastilhas de freio entram em contato com o disco nos dois lados.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

Considere que <\/b><\/span><\/span><\/span>um carro de 500 kg, viajando a uma velocidade de 20 m\/s, precisa parar imediatamente. <\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>motorista o faz sem deslizamento dos pneus, <\/b><\/span><\/span><\/span>dentro de <\/b><\/span><\/span><\/span>uma dist\u00e2ncia de 20 m. <\/b><\/span><\/span><\/span>Considerando-se o <\/b><\/span><\/span><\/span>exposto, calcule:<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>A <\/b><\/span><\/span><\/span>for\u00e7a m\u00e9dia com que cada pist\u00e3o pressiona o disco de freio. <\/b><\/span><\/span><\/span>Use <\/b><\/span><\/span><\/span>0,8 <\/b><\/span><\/span><\/span>como o <\/b><\/span><\/span><\/span>coeficiente de atrito entre a pastilha e o disco.<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>A <\/b><\/span><\/span><\/span>press\u00e3o do \u00f3leo que empurra o pist\u00e3o<\/b><\/span><\/span><\/span>. Use o <\/b><\/span><\/span><\/span>di\u00e2metro de 4 cm para esse pist\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

36-(UFJF-MG)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Os <\/b><\/span><\/span><\/span>pneus dianteiros<\/b><\/span><\/span><\/span> de um <\/b><\/span><\/span><\/span>autom\u00f3vel foram calibrados com 30\u00a0lb\/pol\u00b2 (21.10<\/b><\/span><\/span><\/span>4<\/b><\/span><\/span><\/sup><\/span>N\/m\u00b2) e os pneus traseiros com 32\u00a0lb\/pol\u00b2 (22.10<\/b><\/span><\/span><\/span>4<\/b><\/span><\/span><\/sup><\/span>N\/m\u00b2).<\/b><\/span><\/span><\/span>\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>\u00e1rea de contato dos pneus com o solo \u00e9 cerca de 110 cm\u00b2 em cada um deles. <\/b><\/span><\/span><\/span><\/p>\n

Sabe-se que a <\/b><\/span><\/span><\/span>press\u00e3o indicada pelo calibrador \u00e9 a diferen\u00e7a entre a press\u00e3o interna e a press\u00e3o atmosf\u00e9rica.<\/b><\/span><\/span><\/span><\/p>\n

a) \u00c9 poss\u00edvel estimar o peso de um autom\u00f3vel conhecendo a press\u00e3o dos pneus e a \u00e1rea de contato dos mesmos com o solo? Justifique por qu\u00ea.<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>Calcule o <\/b><\/span><\/span><\/span>peso aproximado do autom\u00f3vel do exemplo citado.<\/b><\/span><\/span><\/span><\/p>\n

 <\/p>\n

Confira as resolu\u00e7\u00f5es comentadas<\/span><\/a><\/h3>\n","protected":false},"excerpt":{"rendered":"

RACIOC\u00cdNIO L\u00d3GICO HIDROST\u00c1TICA Como esse conte\u00fado envolve muita teoria, em caso de d\u00favidas voc\u00ea pode encontr\u00e1-la em fisicaevestibular.com.br \u2013 Mec\u00e2nica \u2013 Hidrost\u00e1tica) 01-(UEPA-PA) O\u00a0peixe-gota (“Psychrolutes marcidus”),\u00a0uma esp\u00e9cie do Pac\u00edfico que lembra um senhor velho e amargurado, foi eleito o animal mais feio do mundo em um concurso organizado na Gr\u00e3-Bretanha. O\u00a0peixe-gota \u00e9 capaz de suportar uma press\u00e3o m\u00e1xima de 121<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2508,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-2611","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/2611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/comments?post=2611"}],"version-history":[{"count":3,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/2611\/revisions"}],"predecessor-version":[{"id":2617,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/2611\/revisions\/2617"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/2508"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=2611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}