{"id":3269,"date":"2017-09-30T23:49:09","date_gmt":"2017-09-30T23:49:09","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=3269"},"modified":"2024-06-29T23:47:45","modified_gmt":"2024-06-29T23:47:45","slug":"hidrostatica-2017-2016-e-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/vestibulares-recentes\/mecanica\/hidrostatica-2017-2016-e-2015\/","title":{"rendered":"Hidrost\u00e1tica \u2013 2017 \u2013 2016 e 2015"},"content":{"rendered":"

HIDROST\u00c1TICA \u2013 2017 \u2013 2016 e 2015<\/span><\/span><\/span><\/p>\n

Densidade e Press\u00e3o<\/span><\/span><\/span><\/p>\n

 <\/p>\n

01-(FMJ-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span>press\u00e3o atmosf\u00e9rica ao n\u00edvel do mar\u00a0<\/b><\/span><\/span>\u00e9 aproximadamente\u00a0<\/b><\/span><\/span>1,0 \u00d7 10<\/b><\/span><\/span>5<\/b><\/span><\/sup><\/span>\u00a0Pa\u00a0<\/b><\/span><\/span>e se deve ao\u00a0<\/b><\/span><\/span>peso da coluna de ar existente entre<\/b><\/span><\/span>\u00a0<\/b><\/span>a superf\u00edcie e a camada mais externa da atmosfera<\/b><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Suponha<\/b><\/span><\/span>\u00a0<\/b><\/span>que um cilindro aberto nas extremidades, com a base\u00a0<\/b><\/span><\/span>de<\/b><\/span><\/span>\u00a0<\/b><\/span>\u00e1rea igual a 2,0 m\u00b2\u00a0<\/b><\/span><\/span>e apoiada na\u00a0<\/b><\/span><\/span>superf\u00edcie ao n\u00edvel do mar<\/b><\/span><\/span>,<\/b><\/span><\/span>\u00a0<\/b><\/span>tenha a\u00a0<\/b><\/span><\/span>mesma altura que a atmosfera terrestre<\/b><\/span><\/span>. Considerando<\/b><\/span><\/span>\u00a0<\/b><\/span>a\u00a0<\/b><\/span><\/span>acelera\u00e7\u00e3o gravitacional igual a 10 m\/s\u00b2,\u00a0<\/b><\/span><\/span>e\u00a0<\/b><\/span><\/span>constante<\/b><\/span><\/span>\u00a0<\/b><\/span>em toda extens\u00e3o vertical do cilindro<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>a massa de ar contida<\/b><\/span><\/span>\u00a0<\/b><\/span>nesse cilindro \u00e9<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A) 8,0 \u00d7 10<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>\u00a0kg.<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(B) 5,0 \u00d7 10<\/b><\/span><\/span><\/span>5<\/b><\/span><\/span><\/sup><\/span>\u00a0kg.<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(C) 2,0 \u00d7 10<\/b><\/span><\/span><\/span>4<\/b><\/span><\/span><\/sup><\/span>\u00a0kg.<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(D) 5,0 \u00d7 10<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>\u00a0kg.<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(E) 2,0 \u00d7 10<\/b><\/span><\/span>6<\/b><\/span><\/sup><\/span>\u00a0kg.<\/b><\/span><\/span><\/span><\/span><\/p>\n

02-(UEM-PR-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considerando os\u00a0<\/b><\/span><\/span>conceitos relativos \u00e0 press\u00e3o<\/b><\/span><\/span>, assinale o que for\u00a0<\/b><\/span><\/span>correto.<\/b><\/span><\/span><\/p>\n

01)<\/b><\/span><\/span>\u00a0Press\u00e3o \u00e9 uma grandeza vetorial, portanto tem m\u00f3dulo, dire\u00e7\u00e3o e sentido definidos.<\/b><\/span><\/span><\/p>\n

02)<\/b><\/span><\/span>\u00a0A diferen\u00e7a de press\u00e3o entre dois pontos no interior de um l\u00edquido homog\u00eaneo e em equil\u00edbrio \u00e9<\/b><\/span><\/span><\/p>\n

proporcional \u00e0 diferen\u00e7a de profundidade entre esses dois pontos.<\/b><\/span><\/span><\/p>\n

04)<\/b><\/span><\/span>\u00a0No sistema internacional de medidas (SI) a unidade de press\u00e3o \u00e9 o Pascal (Pa).<\/b><\/span><\/span><\/p>\n

08)<\/b><\/span><\/span>\u00a0Quando um dado ponto de um l\u00edquido em equil\u00edbrio no interior de um recipiente sofre uma varia\u00e7\u00e3o de press\u00e3o, essa varia\u00e7\u00e3o de press\u00e3o \u00e9 transmitida a todos os pontos do l\u00edquido e das paredes do recipiente.<\/b><\/span><\/span><\/p>\n

16)<\/b><\/span><\/span>\u00a0Estando um l\u00edquido em um recipiente aberto, a press\u00e3o na superf\u00edcie do l\u00edquido \u00e9 nula.<\/b><\/span><\/span><\/p>\n

03-(EBMSP-BA-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Teorema de Stevin \u2013 press\u00e3o hidrost\u00e1tica – vasos comunicantes<\/span><\/span><\/span><\/p>\n

04-(UNIFESO-RJ-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma\u00a0<\/b><\/span><\/span>esfera\u00a0<\/b><\/span><\/span>est\u00e1 em\u00a0<\/b><\/span><\/span>repouso totalmente imersa em um l\u00edquido<\/b><\/span><\/span>\u00a0que se encontra em\u00a0<\/b><\/span><\/span>equil\u00edbrio hidrost\u00e1tico,<\/b><\/span><\/span>\u00a0conforme a\u00a0<\/b><\/span><\/span>figura a seguir.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Assinale a\u00a0<\/b><\/span><\/span>op\u00e7\u00e3o<\/b><\/span><\/span>\u00a0que\u00a0<\/b><\/span><\/span>melhor representa<\/b><\/span><\/span>, por meio de\u00a0<\/b><\/span><\/span>segmentos orientados, as dire\u00e7\u00f5es, os sentidos e os m\u00f3dulos das for\u00e7as de press\u00e3o exercidas pelo l\u00edquido sobre a esfera.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

05-(PUC-RJ-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>tubo cil\u00edndrico\u00a0<\/b><\/span><\/span>de vidro de\u00a0<\/b><\/span><\/span>5,0 m de comprimento<\/b><\/span><\/span>\u00a0tem um de seus extremos\u00a0<\/b><\/span><\/span>aberto e o outro<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>fechado.<\/b><\/span><\/span>\u00a0Estando\u00a0<\/b><\/span><\/span>inicialmente em contato com o ar \u00e0 press\u00e3o atmosf\u00e9rica (1,0 atm),<\/b><\/span><\/span>\u00a0este tubo \u00e9\u00a0<\/b><\/span><\/span>introduzido dentro de uma piscina com \u00e1gua<\/b><\/span><\/span>, com a\u00a0<\/b><\/span><\/span>parte fechada para cima<\/b><\/span><\/span>, at\u00e9 que a \u00e1gua se haja\u00a0<\/b><\/span><\/span>elevado a um quinto da altura do tubo<\/b><\/span><\/span>. O tubo \u00e9\u00a0<\/b><\/span><\/span>mantido nesta posi\u00e7\u00e3o.<\/b><\/span><\/span><\/p>\n

Veja a\u00a0<\/b><\/span><\/span>figura.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Suponha que este processo ocorre \u00e0\u00a0<\/b><\/span><\/span>temperatura constante.<\/b><\/span><\/span>\u00a0Tome o\u00a0<\/b><\/span><\/span>ar como g\u00e1s ideal.<\/b><\/span><\/span><\/p>\n

Considere:<\/b><\/span><\/span><\/p>\n

1 atm = 1,0.10<\/b><\/span><\/span>5<\/b><\/span><\/sup><\/span>\u00a0Pa<\/b><\/span><\/span><\/p>\n

g = 10 m\/s<\/b><\/span><\/span>2<\/b><\/span><\/sup><\/span><\/p>\n

\u03c1\u00e1gua= 1,0.10<\/b><\/span><\/span>3<\/b><\/span><\/sup><\/span>\u00a0kg\/m<\/b><\/span><\/span>3<\/b><\/span><\/sup><\/span><\/p>\n

a)<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>Qual \u00e9 a\u00a0<\/b><\/span><\/span>press\u00e3o do ar dentro do tubo<\/b><\/span><\/span>, em\u00a0<\/b><\/span><\/span>atm?<\/b><\/span><\/span><\/p>\n

b)<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>Qual \u00e9 a\u00a0<\/b><\/span><\/span>altura H do tubo<\/b><\/span><\/span>\u00a0que se encontra\u00a0<\/b><\/span><\/span>submergida?<\/b><\/span><\/span><\/p>\n

06-(UERJ-RJ-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Observe o\u00a0<\/b><\/span><\/span>aumento da profundidade<\/b><\/span><\/span>\u00a0de prospec\u00e7\u00e3o de petr\u00f3leo em \u00e1guas brasileiras com o\u00a0<\/b><\/span><\/span>passar dos anos, registrado na figura a seguir.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considerando os\u00a0<\/b><\/span><\/span>dados acima,<\/b><\/span><\/span>\u00a0calcule,\u00a0<\/b><\/span><\/span>em atm,<\/b><\/span><\/span>\u00a0a\u00a0<\/b><\/span><\/span>diferen\u00e7a\u00a0<\/b><\/span><\/span>entre a <\/b><\/span><\/span>press\u00e3o<\/b><\/span><\/span>\u00a0correspondente \u00e0 profundidade de prospec\u00e7\u00e3o de petr\u00f3leo alcan\u00e7ada no ano de<\/b><\/span><\/span>1977 e<\/b><\/span><\/span>\u00a0aquela alcan\u00e7ada em\u00a0<\/b><\/span><\/span>2003.<\/b><\/span><\/span><\/p>\n

d\u00e1gua do mar=10<\/b><\/span><\/span>3<\/b><\/span><\/sup><\/span> kg\/m<\/b><\/span><\/span>3<\/b><\/span><\/sup><\/span>\u00a0e g=10m\/s<\/b><\/span><\/span>2<\/b><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/p>\n

 <\/p>\n

07-(URCA-CE-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Suponha\u00a0que\u00a0<\/b><\/span><\/span>a\u00a0cada\u00a010 metros de profundidade\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>press\u00e3o hidrost\u00e1tica\u00a0<\/b><\/span><\/span>em um profundo\u00a0<\/b><\/span><\/span>lago aumenta de aproximadamente 1 atmosfera.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Sendo\u00a0<\/b><\/span><\/span>1\u00a0atmosfera\u00a0a\u00a0press\u00e3o sobre a\u00a0superf\u00edcie\u00a0do\u00a0lago\u00a0e\u00a05\u00a0atmosferas a\u00a0press\u00e3o\u00a0total\u00a0<\/b><\/span><\/span>no<\/b><\/span><\/span><\/span><\/span><\/p>\n

no\u00a0<\/b><\/span><\/span>fundo\u00a0do\u00a0lago\u00a0ent\u00e3o\u00a0a profundidade\u00a0do\u00a0lago\u00a0\u00e9\u00a0de:<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Experi\u00eancia de Torricelli<\/span><\/span><\/span><\/p>\n

08-(PUC-RJ-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>tubo cil\u00edndrico\u00a0<\/b><\/span><\/span>de vidro de\u00a0<\/b><\/span><\/span>5,0 m de comprimento<\/b><\/span><\/span>\u00a0tem um de seus extremos\u00a0<\/b><\/span><\/span>aberto e o outro<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>fechado.<\/b><\/span><\/span>\u00a0Estando\u00a0<\/b><\/span><\/span>inicialmente em contato com o ar \u00e0 press\u00e3o atmosf\u00e9rica (1,0 atm),<\/b><\/span><\/span>\u00a0este tubo \u00e9\u00a0<\/b><\/span><\/span>introduzido dentro de uma piscina com \u00e1gua<\/b><\/span><\/span>, com a\u00a0<\/b><\/span><\/span>parte fechada para cima<\/b><\/span><\/span>, at\u00e9 que a \u00e1gua se haja\u00a0<\/b><\/span><\/span>elevado a um quinto da altura do tubo<\/b><\/span><\/span>. O tubo \u00e9\u00a0<\/b><\/span><\/span>mantido nesta posi\u00e7\u00e3o.<\/b><\/span><\/span><\/p>\n

Veja a\u00a0<\/b><\/span><\/span>figura.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Suponha que este processo ocorre \u00e0\u00a0<\/b><\/span><\/span>temperatura constante.<\/b><\/span><\/span>\u00a0Tome o\u00a0<\/b><\/span><\/span>ar como g\u00e1s ideal.<\/b><\/span><\/span><\/p>\n

Considere:<\/b><\/span><\/span><\/p>\n

1 atm = 1,0.10<\/b><\/span><\/span>5<\/b><\/span><\/sup><\/span>\u00a0Pa<\/b><\/span><\/span><\/p>\n

g = 10 m\/s<\/b><\/span><\/span>2<\/b><\/span><\/sup><\/span><\/p>\n

\u03c1\u00e1gua= 1,0.10<\/b><\/span><\/span>3<\/b><\/span><\/sup><\/span>\u00a0kg\/m<\/b><\/span><\/span>3<\/b><\/span><\/sup><\/span><\/p>\n

a)<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>Qual \u00e9 a\u00a0<\/b><\/span><\/span>press\u00e3o do ar dentro do tubo<\/b><\/span><\/span>, em\u00a0<\/b><\/span><\/span>atm?<\/b><\/span><\/span><\/p>\n

b)<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>Qual \u00e9 a\u00a0<\/b><\/span><\/span>altura H do tubo<\/b><\/span><\/span>\u00a0que se encontra\u00a0<\/b><\/span><\/span>submergida?<\/b><\/span><\/span><\/p>\n

Princ\u00edpio de Pascal<\/b><\/span><\/span><\/span><\/p>\n

09-(AFA-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span>figura abaixo\u00a0<\/b><\/span><\/span>representa um\u00a0<\/b><\/span><\/span>macaco hidr\u00e1ulico\u00a0<\/b><\/span><\/span>constitu\u00eddo de\u00a0<\/b><\/span><\/span>dois pist\u00f5es A e B de raios cm RA\u00a0=<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

60 cm e RB\u00a0= 240cm ,<\/b><\/span><\/span>respectivamente.\u00a0<\/b><\/span><\/span>Esse dispositivo\u00a0<\/b><\/span><\/span>ser\u00e1 utilizado para\u00a0<\/b><\/span><\/span>elevar a uma\u00a0<\/b><\/span><\/span>altura de 2 m<\/b><\/span><\/span>, em rela\u00e7\u00e3o \u00e0 posi\u00e7\u00e3o inicial, um ve\u00edculo de\u00a0<\/b><\/span><\/span>massa igual a 1 tonelada\u00a0<\/b><\/span><\/span>devido \u00e0 aplica\u00e7\u00e3o de<\/b><\/span><\/span><\/p>\n

uma for\u00e7a\u00a0\"\"<\/b><\/span><\/span>. Despreze as\u00a0<\/b><\/span><\/span>massas dos pist\u00f5es<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>todos os atritos\u00a0<\/b><\/span><\/span>e considere que o\u00a0<\/b><\/span><\/span>l\u00edquido seja incompress\u00edvel.<\/b><\/span><\/span><\/p>\n

Nessas condi\u00e7\u00f5es, o\u00a0<\/b><\/span><\/span>fator de multiplica\u00e7\u00e3o de for\u00e7a\u00a0<\/b><\/span><\/span>deste macaco hidr\u00e1ulico e o\u00a0<\/b><\/span><\/span>trabalho, em joules<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>realizado pela for\u00e7a\u00a0\"\"<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>aplicada sobre o pist\u00e3o de menor \u00e1rea<\/b><\/span><\/span>, ao\u00a0<\/b><\/span><\/span>levantar o ve\u00edculo bem lentamente e com velocidade constante<\/b><\/span><\/span>, s\u00e3o, respectivamente,<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considerando\u00a0<\/b><\/span><\/span>dA<\/b><\/span><\/span>\u00a0como sendo o\u00a0<\/b><\/span><\/span>deslocamento do \u00eambolo A\u00a0<\/b><\/span><\/span>e\u00a0<\/b><\/span><\/span>dB<\/b><\/span><\/span>\u00a0como sendo o\u00a0<\/b><\/span><\/span>deslocamento do \u00eambolo B,\u00a0<\/b><\/span><\/span>possuindo o l\u00edquido um volume constante, ou seja, com um\u00a0<\/b><\/span><\/span>l\u00edquido incompress\u00edvel<\/b><\/span><\/span>, teremos que o um <\/b><\/span><\/span>volume l\u00edquido que desce at\u00e9 A, \u00e9 o mesmo volume l\u00edquido que sobe at\u00e9 B.\u00a0<\/b><\/span><\/span><\/p>\n

Teorema de Arquimedes \u2013 Empuxo<\/b><\/span><\/span><\/span><\/p>\n

10-(PUC-MG-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Dentro da \u00e1gua<\/b><\/span><\/span>, as pessoas sentem uma\u00a0<\/b><\/span><\/span>sensa\u00e7\u00e3o de estarem mais leves <\/b><\/span><\/span>devido \u00e0\u00a0<\/b><\/span><\/span>for\u00e7a exercida<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

pela \u00e1gua sobre o corpo imerso<\/b><\/span><\/span>. Esta\u00a0<\/b><\/span><\/span>for\u00e7a descrita por Arquimedes<\/b><\/span><\/span>\u00a0\u00e9 denominada de\u00a0<\/b><\/span><\/span>empuxo.<\/b><\/span><\/span>\u00a0\u00c9\u00a0<\/b><\/span><\/span>CORRETO<\/b><\/span><\/span>\u00a0afirmar:<\/b><\/span><\/span><\/p>\n

a)<\/b><\/span><\/span>\u00a0O empuxo \u00e9 proporcional ao volume de \u00e1gua deslocado pelo corpo.<\/b><\/span><\/span><\/p>\n

b<\/b><\/span><\/span>) A dire\u00e7\u00e3o do empuxo pode ser horizontal.<\/b><\/span><\/span><\/p>\n

c)<\/b><\/span><\/span>\u00a0O empuxo \u00e9 sempre menor que o peso do corpo imerso na \u00e1gua.<\/b><\/span><\/span><\/p>\n

d)<\/b><\/span><\/span>\u00a0O empuxo \u00e9 igual ao peso do corpo imerso.<\/b><\/span><\/span><\/p>\n

11-(FMJ-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Para\u00a0<\/b><\/span><\/span>determinar a densidade<\/b><\/span><\/span>\u00a0de uma amostra de sangue\u00a0<\/b><\/span><\/span>humano<\/b><\/span><\/span>, utiliza-se um\u00a0<\/b><\/span><\/span>cubo de<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>volume V<\/b><\/span><\/span>. Colocando-o suavemente sobre a superf\u00edcie de uma amostra de <\/b><\/span><\/span>sangue normal, de<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>densidade absoluta \u03c1<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>o cubo flutua com metade de seu volume submerso<\/b><\/span><\/span>, como mostra a figura.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Ao\u00a0<\/b><\/span><\/span>colocar-se esse mesmo cubo na superf\u00edcie de outra amostra de sangue<\/b><\/span><\/span>, verifica-se que ele\u00a0<\/b><\/span><\/span>flutua com 52% de seu volume submerso<\/b><\/span><\/span>.<\/b><\/span><\/span><\/p>\n

a)<\/b><\/span><\/span>\u00a0Deduza uma express\u00e3o para a\u00a0<\/b><\/span><\/span>massa<\/b><\/span><\/span>\u00a0do cubo\u00a0<\/b><\/span><\/span>em fun\u00e7\u00e3o de \u03c1 e V.<\/b><\/span><\/span><\/p>\n

b)<\/b><\/span><\/span>\u00a0Determine a\u00a0<\/b><\/span><\/span>raz\u00e3o \u03c1\/\u03c1\u2019<\/b><\/span><\/span>, sendo\u00a0<\/b><\/span><\/span>\u03c1\u2019 a densidade da segunda amostra de sangue.<\/b><\/span><\/span><\/p>\n

 <\/p>\n

12-(MACKENZIE-SP-2017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>navio flutua\u00a0<\/b><\/span><\/span>por que<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

a)\u00a0<\/b><\/span><\/span>seu\u00a0<\/b><\/span><\/span>peso \u00e9 pequeno\u00a0<\/b><\/span><\/span>quando\u00a0<\/b><\/span><\/span>comparado com seu volume.<\/b><\/span><\/span><\/span><\/span><\/p>\n

b)\u00a0<\/b><\/span><\/span>seu\u00a0<\/b><\/span><\/span>volume \u00e9 igual ao volume do l\u00edquido deslocado.\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

c)\u00a0<\/b><\/span><\/span>o\u00a0<\/b><\/span><\/span>peso do volume do l\u00edquido deslocado \u00e9 igual ao peso do navio.\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

d)\u00a0<\/b><\/span><\/span>o\u00a0<\/b><\/span><\/span>peso do navio \u00e9 menor que o peso do l\u00edquido deslocado<\/b><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

e)\u00a0<\/b><\/span><\/span>o\u00a0<\/b><\/span><\/span>peso do navio\u00a0<\/b><\/span><\/span>\u00e9\u00a0<\/b><\/span><\/span>maior que o peso do l\u00edquido deslocado.<\/b><\/span><\/span><\/span><\/span><\/p>\n

13-(FGV-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

A\u00a0<\/b><\/span><\/span>figura a seguir ilustra tr\u00eas cilindros s\u00f3lidos maci\u00e7os e homog\u00eaneos<\/b><\/span><\/span>, de <\/b><\/span><\/span>mesma \u00e1rea da<\/b><\/span><\/span><\/span><\/span>\"\"<\/p>\n

base e altura (volumes iguais),<\/b><\/span><\/span>em\u00a0<\/b><\/span><\/span>equil\u00edbrio em um l\u00edquido.<\/b><\/span><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span>cilindro A est\u00e1 completamente submerso, sem tocar no fundo do recipiente,<\/b><\/span><\/span>\u00a0o <\/b><\/span><\/span>cilindro B<\/b><\/span><\/span>\u00a0est\u00e1 com\u00a0<\/b><\/span><\/span>metade de seu volume emerso, enquanto o cilindro C apresenta 1\/3 de seu volume abaixo da superf\u00edcie livre do l\u00edquido.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Sobre\u00a0<\/b><\/span><\/span>essa situa\u00e7\u00e3o, \u00e9 correto afirmar\u00a0<\/b><\/span><\/span>que<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>densidade do cilindro A \u00e9 maior do que a do l\u00edquido<\/b><\/span><\/span>, pois ele est\u00e1<\/b><\/span><\/span>completamente submerso.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(B)\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>densidade do cilindro B \u00e9 igual ao dobro da do l\u00edquido<\/b><\/span><\/span>, pois ele<\/b><\/span><\/span>desloca metade do seu volume no l\u00edquido<\/b><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(C)\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>densidade do cilindro A \u00e9 maior do que a do cilindro B,\u00a0<\/b><\/span><\/span>que \u00e9\u00a0<\/b><\/span><\/span>maior do que a do cilindro C,<\/b><\/span><\/span>\u00a0em\u00a0<\/b><\/span><\/span>raz\u00e3o dos volumes deslocados no l\u00edquido.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(D)\u00a0<\/b><\/span><\/span>pelo fato de estar\u00a0<\/b><\/span><\/span>completamente submerso, o peso do cilindro A \u00e9 maior do que o empuxo sobre ele e maior que os pesos de B e de C.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(E)\u00a0<\/b><\/span><\/span>o\u00a0<\/b><\/span><\/span>peso do cilindro C \u00e9 menor do que o empuxo sobre ele porque apenas 1\/3 de seu volume est\u00e1 submerso.<\/b><\/span><\/span><\/span><\/span><\/p>\n

 <\/p>\n

14-(Medicina \u2013 USCS-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

15-(CEDERJ-RJ-2017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma esfera de madeira\u00a0<\/b><\/span><\/span>flutua imersa, parcialmente<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>na \u00e1gua de um<\/b><\/span><\/span>aqu\u00e1rio de \u00e1gua doce (sem sal)<\/b><\/span><\/span>. Quando<\/b><\/span><\/span>\u00a0<\/b><\/span>essa \u00e1gua \u00e9\u00a0<\/b><\/span><\/span>trocada por \u00e1gua do mar<\/b><\/span><\/span>, uma nova situa\u00e7\u00e3o<\/b><\/span><\/span>\u00a0<\/b><\/span>de equil\u00edbrio \u00e9 estabelecida. Nessa nova situa\u00e7\u00e3o, <\/b><\/span><\/span>em<\/b><\/span><\/span>\u00a0<\/b><\/span>compara\u00e7\u00e3o \u00e0 anterior, o empuxo sobre a esfera e o seu<\/b><\/span><\/span>\u00a0<\/b><\/span>volume submerso s\u00e3o<\/b><\/span><\/span>,:\"\"<\/b><\/span><\/span><\/span><\/span><\/p>\n

Respectivamente:<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A)\u00a0o mesmo e maior.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(B)\u00a0maior e o mesmo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(C)\u00a0maior e menor.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(D)\u00a0o mesmo e menor.<\/b><\/span><\/span><\/span><\/span><\/p>\n

16-(UFPR-PR-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>objeto s\u00f3lido\u00a0<\/b><\/span><\/span>com\u00a0<\/b><\/span><\/span>massa 600 g\u00a0<\/b><\/span><\/span>e\u00a0<\/b><\/span><\/span>volume 1 litro <\/b><\/span><\/span>est\u00e1\u00a0<\/b><\/span><\/span>parcialmente imerso em um l\u00edquido,\u00a0<\/b><\/span><\/span>de<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

maneira que\u00a0<\/b><\/span><\/span>80% do seu volume est\u00e3o submersos.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Considerando a\u00a0<\/b><\/span><\/span>acelera\u00e7\u00e3o da gravidade igual a 10 m\/s<\/b><\/span><\/span>2<\/b><\/span><\/sup><\/span>\u00a0<\/b><\/span>, assinale a <\/b><\/span><\/span>alternativa que apresenta\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>massa espec\u00edfica do l\u00edquido.<\/b><\/span><\/span><\/span><\/span><\/p>\n

17-(EBMSP-BA-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span>pr\u00e1tica de atividade f\u00edsica na \u00e1gua aquecida\u00a0<\/b><\/span><\/span>traz muitos\u00a0<\/b><\/span><\/span>efeitos terap\u00eauticos ben\u00e9ficos,\u00a0<\/b><\/span><\/span>como o\u00a0<\/b><\/span><\/span>relaxamento, a analgesia, a redu\u00e7\u00e3o do impacto nas articula\u00e7\u00f5es.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Desprezando\u00a0<\/b><\/span><\/span>os efeitos da\u00a0<\/b><\/span><\/span>varia\u00e7\u00e3o da temperatura e da varia\u00e7\u00e3o do volume corporal\u00a0<\/b><\/span><\/span>durante a\u00a0<\/b><\/span><\/span>inspira\u00e7\u00e3o e a expira\u00e7\u00e3o e sabendo que<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u2022\u00a0<\/span>o m\u00f3dulo da acelera\u00e7\u00e3o\u00a0<\/b><\/span><\/span>da<\/b><\/span><\/span>\u00a0gravidade\u00a0<\/b><\/span><\/span>local \u00e9 igual a\u00a0<\/b><\/span><\/span>10m\/s<\/b><\/span><\/span>2<\/b><\/span><\/sup><\/span>,<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u2022\u00a0<\/span>a<\/b><\/span><\/span>\u00a0<\/b><\/span>densidade da \u00e1gua\u00a0<\/b><\/span><\/span>\u00e9 igual a\u00a0<\/b><\/span><\/span>1,00g\/cm<\/b><\/span><\/span>3<\/b><\/span><\/sup><\/span>,<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u2022\u00a0<\/span>a densidade do corpo humano\u00a0<\/b><\/span><\/span>\u00e9 igual\u00a0<\/b><\/span><\/span>a 0,93g\/cm<\/b><\/span><\/span>3<\/b><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Determine<\/b><\/span><\/span>\u00a0o\u00a0<\/b><\/span><\/span>m\u00f3dulo do peso de um objeto\u00a0<\/b><\/span><\/span>que dever\u00e1\u00a0<\/b><\/span><\/span>ficar emerso sobre uma pessoa,\u00a0<\/b><\/span><\/span>com<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

massa igual a 70,0kg,<\/b><\/span><\/span>\u00a0para\u00a0<\/b><\/span><\/span>mant\u00ea-la completamente submersa e em equil\u00edbrio, flutuando horizontalmente\u00a0<\/b><\/span><\/span>sob a\u00a0<\/b><\/span><\/span>superf\u00edcie da \u00e1gua de uma piscina t\u00e9rmica.<\/b><\/span><\/span><\/span><\/span><\/p>\n

18-(PUC-SP-016)<\/b><\/span><\/span><\/span><\/p>\n

Uma\u00a0<\/b><\/span><\/span>embarca\u00e7\u00e3o<\/b><\/span><\/span>\u00a0quando est\u00e1\u00a0<\/b><\/span><\/span>lastreada, apresenta massa de 10.000kg.<\/b><\/span><\/span><\/p>\n

Ela possui um\u00a0<\/b><\/span><\/span>formato quadrado cujos lados s\u00e3o iguais a 10m\u00a0<\/b><\/span><\/span>e \u00e9 utilizada <\/b><\/span><\/span>no transporte de 2<\/b><\/span><\/span> <\/b>ve\u00edculos pesados por vez<\/b><\/span><\/span>, de uma\u00a0<\/b><\/span><\/span>margem \u00e0 outra de um lago de \u00e1guas tranquilas<\/b><\/span><\/span>.<\/b><\/span><\/span>\"\"<\/p>\n

Numa determinada travessia, em que ela <\/b><\/span><\/span>transportava dois caminh\u00f5es id\u00eanticos e carregados com igual quantidade de uma mesma carga,\u00a0<\/b><\/span><\/span>verificou-se que a\u00a0<\/b><\/span><\/span>parte submersa dessa embarca\u00e7\u00e3o era de 40cm.<\/b><\/span><\/span><\/p>\n

Se\u00a0<\/b><\/span><\/span>cada caminh\u00e3o vazio tem massa de 10 toneladas,\u00a0<\/b><\/span><\/span>determine a\u00a0<\/b><\/span><\/span>massa da carga, em kg, transportada por cada um deles. Dados:<\/b><\/span><\/span>\u00a0Densidade da \u00e1gua=\u00a0<\/b><\/span><\/span>1g\/cm3<\/b><\/span><\/span>; M\u00f3dulo da acelera\u00e7\u00e3o da gravidade=\u00a0<\/b><\/span><\/span>10m\/s2<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

19-(Mackenzie-SP-016)<\/b><\/span><\/span><\/span><\/p>\n

\"Hidrost\u00e1tica\"<\/p>\n

Devido \u00e0 crise h\u00eddrica que se instalou na cidade de S\u00e3o Paulo, um estudante, ap\u00f3s a aula de hidrost\u00e1tica, resolveu colocar uma garrafa de <\/b><\/span><\/span>1,0 litro, cheia de \u00e1gua<\/b><\/span><\/span>, no interior da\u00a0<\/b><\/span><\/span>caixa acoplada de descarga<\/b><\/span><\/span>. Essa medida gerou uma\u00a0<\/b><\/span><\/span>economia de \u00e1gua<\/b><\/span><\/span>\u00a0no final de um per\u00edodo. Essa ideia colocada em pr\u00e1tica\u00a0<\/b><\/span><\/span>foi baseada no<\/b><\/span><\/span><\/p>\n

a) Princ\u00edpio de Stevin.<\/b><\/span><\/span><\/p>\n

b) Princ\u00edpio de Arquimedes.<\/b><\/span><\/span><\/p>\n

c) Princ\u00edpio de Pascal.<\/b><\/span><\/span><\/p>\n

d) Princ\u00edpio dos vasos comunicantes.<\/b><\/span><\/span><\/p>\n

e) Teorema de Bernoulli.<\/b><\/span><\/span><\/p>\n

 <\/p>\n

Confira a resolu\u00e7\u00e3o comentada<\/span><\/a><\/h3>\n

 <\/p>\n

Clique aqui para ver sobre o tema!<\/a><\/p>\n

Confira as v\u00eddeo aulas!<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

HIDROST\u00c1TICA \u2013 2017 \u2013 2016 e 2015 Densidade e Press\u00e3o   01-(FMJ-SP-017) A\u00a0press\u00e3o atmosf\u00e9rica ao n\u00edvel do mar\u00a0\u00e9 aproximadamente\u00a01,0 \u00d7 105\u00a0Pa\u00a0e se deve ao\u00a0peso da coluna de ar existente entre\u00a0a superf\u00edcie e a camada mais externa da atmosfera. Suponha\u00a0que um cilindro aberto nas extremidades, com a base\u00a0de\u00a0\u00e1rea igual a 2,0 m\u00b2\u00a0e apoiada na\u00a0superf\u00edcie ao n\u00edvel do mar,\u00a0tenha a\u00a0mesma altura que<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3123,"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-3269","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3269","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=3269"}],"version-history":[{"count":5,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3269\/revisions"}],"predecessor-version":[{"id":9853,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3269\/revisions\/9853"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3123"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=3269"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}