{"id":36,"date":"2014-11-14T21:36:28","date_gmt":"2014-11-14T21:36:28","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=36"},"modified":"2024-09-02T16:42:19","modified_gmt":"2024-09-02T16:42:19","slug":"exercicios-da-escola-preparatoria-de-cadetes-do-exercito-espcex-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-da-escola-preparatoria-de-cadetes-do-exercito-espcex-2015\/","title":{"rendered":"Exerc\u00edcios da Escola Preparat\u00f3ria de Cadetes do Ex\u00e9rcito (EsPCEx) 2015"},"content":{"rendered":"

\"\"<\/p>\n

Para ingressar na AMAN o jovem dever\u00e1 realizar um\u00a0concurso p\u00fablico\u00a0para a\u00a0<\/b><\/span><\/span><\/span>Escola Preparat\u00f3ria de Cadetes do Ex\u00e9rcito (EsPCEx)\u00a0<\/b><\/span><\/span><\/span>onde ir\u00e1 cursar um ano de Ensino Superior e, obtendo aproveitamento, <\/b><\/span><\/span><\/span>seguir\u00e1 para a AMAN<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span><\/span>EsPCEX<\/b><\/span><\/span><\/span> est\u00e1 localizada na cidade de <\/b><\/span><\/span><\/span>Campinas – SP<\/b><\/span><\/span><\/span>. Durante o curso, o jovem estar\u00e1 na condi\u00e7\u00e3o de aluno (isto equivale a uma <\/b><\/span><\/span><\/span>gradua\u00e7\u00e3o entre as de 2\u00ba Sargento e 3\u00ba Sargento).<\/b><\/span><\/span><\/span><\/p>\n

Para realizar o concurso, o candidato deve ser brasileiro nato, estar cursando ou ter cursado, no m\u00ednimo, a 3\u00aa s\u00e9rie do ensino m\u00e9dio, em estabelecimento de ensino reconhecido, ou ser concludente do Ensino M\u00e9dio, de acordo com a legisla\u00e7\u00e3o federal vigente.<\/b><\/span><\/span><\/span><\/p>\n

Deve ter idade de\u00a016 (dezesseis) a 21 (vinte)\u00a0anos, completados no per\u00edodo de 1\u00ba de janeiro a\u00a031 de dezembro do ano do concurso (ano anterior ao da matr\u00edcula).<\/b><\/span><\/span><\/span><\/p>\n

O pedido de\u00a0inscri\u00e7\u00e3o ser\u00e1 feito por meio de requerimento do candidato, civil ou militar, dirigido ao Comandante da <\/b><\/span><\/span><\/span>EsPCEx <\/b><\/span><\/span><\/span>e remetido diretamente \u00e0quela Escola, por meio da rede mundial de computadores (Internet), dentro do prazo estabelecido no Calend\u00e1rio Anual do Processo Seletivo, o qual ser\u00e1 publicado juntamente com o Edital de abertura do processo seletivo.<\/b><\/span><\/span><\/span><\/p>\n

Para maiores esclarecimentos sobre o Concurso, entre em contato com a EsPCEx no seguinte endere\u00e7o eletr\u00f4nico:\u00a0<\/b><\/span><\/span><\/span>http:\/\/www.espcex.ensino.eb.br\/<\/b><\/span><\/span><\/span><\/a><\/p>\n

01-(EsPCEx-AMAN-SP-RJ)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma fibra \u00f3ptica \u00e9 um filamento flex\u00edvel, transparente e cil\u00edndrico, que possui uma estrutura<\/b><\/span><\/span><\/span><\/p>\n

simples composta por um <\/b><\/span><\/span><\/span>n\u00facleo de vidro, por onde a luz se propaga, e uma casca de vidro, ambos<\/b><\/span><\/span><\/span><\/p>\n

com \u00edndices de refra\u00e7\u00e3o diferentes.<\/b><\/span><\/span><\/span><\/p>\n

Um <\/b><\/span><\/span><\/span>feixe de luz monocrom\u00e1tico<\/b><\/span><\/span><\/span>, que se propaga no <\/b><\/span><\/span><\/span>interior do n\u00facleo<\/b><\/span><\/span><\/span>, sofre <\/b><\/span><\/span><\/span>reflex\u00e3o total <\/b><\/span><\/span><\/span>na<\/b><\/span><\/span><\/span><\/p>\n

superf\u00edcie de separa\u00e7\u00e3o entre o <\/b><\/span><\/span><\/span>n\u00facleo e a casca segundo um \u00e2ngulo de incid\u00eancia \u03b1<\/b><\/span><\/span><\/span>, conforme<\/b><\/span><\/span><\/span><\/p>\n

representado no <\/b><\/span><\/span><\/span>desenho abaixo (corte longitudinal da fibra).<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Com rela\u00e7\u00e3o \u00e0 <\/b><\/span><\/span><\/span>reflex\u00e3o total mencionada acima<\/b><\/span><\/span><\/span>, s\u00e3o feitas as <\/b><\/span><\/span><\/span>afirmativas abaixo.<\/b><\/span><\/span><\/span><\/p>\n

(I) <\/b><\/span><\/span><\/span>O feixe luminoso propaga-se <\/b><\/span><\/span><\/span>do meio menos refringente para o meio mais refringente.<\/b><\/span><\/span><\/span><\/p>\n

(II) <\/b><\/span><\/span><\/span>Para que ela ocorra, o <\/b><\/span><\/span><\/span>\u00e2ngulo de incid\u00eancia \u03b1 deve ser inferior ao \u00e2ngulo limite da superf\u00edcie de separa\u00e7\u00e3o entre o n\u00facleo e a casca.<\/b><\/span><\/span><\/span><\/p>\n

(III) <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span><\/span>\u00e2ngulo limite <\/b><\/span><\/span><\/span>da superf\u00edcie de separa\u00e7\u00e3o entre <\/b><\/span><\/span><\/span>o n\u00facleo e a casca depende do \u00edndice de refra\u00e7\u00e3o do n\u00facleo e da casca.<\/b><\/span><\/span><\/span><\/p>\n

(IV) <\/b><\/span><\/span><\/span>O feixe luminoso n\u00e3o sofre refra\u00e7\u00e3o na superf\u00edcie de separa\u00e7\u00e3o entre o n\u00facleo e a casca.<\/b><\/span><\/span><\/span><\/p>\n

Dentre as afirma\u00e7\u00f5es acima, as \u00fanicas corretas s\u00e3o:<\/b><\/span><\/span><\/span><\/p>\n

(A) <\/b><\/span><\/span><\/span>I e II <\/b><\/span><\/span><\/span>(B) <\/b><\/span><\/span><\/span>III e IV <\/b><\/span><\/span><\/span>(C) <\/b><\/span><\/span><\/span>II e III <\/b><\/span><\/span><\/span>(D) <\/b><\/span><\/span><\/span>I e IV <\/b><\/span><\/span><\/span>(E) <\/b><\/span><\/span><\/span>I e III<\/b><\/span><\/span><\/span><\/p>\n

02-(EsPCEx-AMAN-SP-RJ)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Pode-se observar, no desenho abaixo, um <\/b><\/span><\/span><\/span>sistema de tr\u00eas vasos comunicantes cil\u00edndricos F<\/b><\/span><\/span><\/span>,<\/b><\/span><\/span><\/span><\/p>\n

G e H distintos, abertos <\/b><\/span><\/span><\/span>e em repouso sobre um <\/b><\/span><\/span><\/span>plano horizontal na superf\u00edcie da Terra<\/b><\/span><\/span><\/span>. <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Coloca-se <\/b><\/span><\/span><\/span>um l\u00edquido homog\u00eaneo <\/b><\/span><\/span><\/span>no interior dos vasos de modo que <\/b><\/span><\/span><\/span>n\u00e3o haja transbordamento <\/b><\/span><\/span><\/span>por nenhum deles.<\/b><\/span><\/span><\/span><\/p>\n

Sendo <\/b><\/span><\/span><\/span>h<\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/sub><\/span>, h<\/b><\/span><\/span><\/span>G<\/b><\/span><\/span><\/sub><\/span> e h<\/b><\/span><\/span><\/span>H<\/b><\/span><\/span><\/sub><\/span> <\/b>o <\/b><\/span><\/span><\/span>n\u00edvel das alturas <\/b><\/span><\/span><\/span>do l\u00edquido em equil\u00edbrio em <\/b><\/span><\/span><\/span>rela\u00e7\u00e3o \u00e0 base dos respectivos <\/b><\/span><\/span><\/span>vasos <\/b><\/span><\/span><\/span>F, G e H<\/b><\/span><\/span><\/span>, ent\u00e3o, a <\/b><\/span><\/span><\/span>rela\u00e7\u00e3o entre as alturas <\/b><\/span><\/span><\/span>em cada vaso que representa esse sistema em <\/b><\/span><\/span><\/span>equil\u00edbrio est\u00e1tico<\/b><\/span><\/span><\/span> \u00e9:<\/b><\/span><\/span><\/span><\/p>\n

(A) <\/b><\/span><\/span><\/span>h<\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/sub><\/span>=h<\/b><\/span><\/span><\/span>G<\/b><\/span><\/span><\/sub><\/span>=h<\/b><\/span><\/span><\/span>H<\/b><\/span><\/span><\/sub><\/span> <\/b>(B) <\/b><\/span><\/span><\/span>h<\/b><\/span><\/span><\/span>G<\/b><\/span><\/span><\/sub><\/span>>h<\/b><\/span><\/span><\/span>H<\/b><\/span><\/span><\/sub><\/span>>h<\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/sub><\/span> <\/b>(C) <\/b><\/span><\/span><\/span>h<\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/sub><\/span>=h<\/b><\/span><\/span><\/span>G<\/b><\/span><\/span><\/sub><\/span>>h<\/b><\/span><\/span><\/span>H<\/b><\/span><\/span><\/sub><\/span> <\/b>(D) <\/b><\/span><\/span><\/span>h<\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/sub><\/span><h<\/b><\/span><\/span><\/span>G<\/b><\/span><\/span><\/sub><\/span>=h<\/b><\/span><\/span><\/span>H<\/b><\/span><\/span><\/sub><\/span> <\/b>(E) <\/b><\/span><\/span><\/span>h<\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/sub><\/span>>h<\/b><\/span><\/span><\/span>H<\/b><\/span><\/span><\/sub><\/span>>h<\/b><\/span><\/span><\/span>G<\/b><\/span><\/span><\/sub><\/span><\/p>\n

03-(EsPCEx-AMAN-SP-RJ)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma das atra\u00e7\u00f5es mais frequentadas de um parque aqu\u00e1tico \u00e9 a <\/b><\/span><\/span><\/span>\u201cpiscina de ondas\u201d.<\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>desenho abaixo <\/b><\/span><\/span><\/span>representa o <\/b><\/span><\/span><\/span>perfil de uma onda <\/b><\/span><\/span><\/span>que se propaga na superf\u00edcie da \u00e1gua da<\/b><\/span><\/span><\/span><\/p>\n

piscina em um dado instante.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>rapaz observa, de fora da piscina<\/b><\/span><\/span><\/span>, o movimento de seu amigo, que se encontra em uma<\/b><\/span><\/span><\/span><\/p>\n

boia sobre a \u00e1gua <\/b><\/span><\/span><\/span>e nota que, durante a passagem da onda, a <\/b><\/span><\/span><\/span>boia oscila para cima e para baixo <\/b><\/span><\/span><\/span>e<\/b><\/span><\/span><\/span><\/p>\n

que, a <\/b><\/span><\/span><\/span>cada 8 segundos, o amigo est\u00e1 sempre na posi\u00e7\u00e3o mais elevada da onda.<\/b><\/span><\/span><\/span><\/p>\n

O motor que impulsiona as \u00e1guas da piscina gera <\/b><\/span><\/span><\/span>ondas peri\u00f3dicas<\/b><\/span><\/span><\/span>. Com base <\/b><\/span><\/span><\/span>nessas<\/b><\/span><\/span><\/span><\/p>\n

informa\u00e7\u00f5es<\/b><\/span><\/span><\/span>, e desconsiderando as for\u00e7as dissipativas na piscina de ondas, \u00e9 poss\u00edvel concluir<\/b><\/span><\/span><\/span><\/p>\n

que a <\/b><\/span><\/span><\/span>onda se propaga com uma velocidade de<\/b><\/span><\/span><\/span><\/p>\n

[A] <\/b><\/span><\/span><\/span>0,15 m\/s <\/b><\/span><\/span><\/span>[B] <\/b><\/span><\/span><\/span>0,30 m\/s <\/b><\/span><\/span><\/span>[C] <\/b><\/span><\/span><\/span>0,40 m\/s <\/b><\/span><\/span><\/span>[D] <\/b><\/span><\/span><\/span>0,50 m\/s <\/b><\/span><\/span><\/span>[E] <\/b><\/span><\/span><\/span>0,60 m\/s<\/b><\/span><\/span><\/span><\/p>\n

04-(EsPCEx-AMAN-SP-RJ)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

No interior de um <\/b><\/span><\/span><\/span>recipiente vazio<\/b><\/span><\/span><\/span>, \u00e9 colocado um <\/b><\/span><\/span><\/span>cubo <\/b><\/span><\/span><\/span>de material homog\u00eaneo de <\/b><\/span><\/span><\/span>aresta igual a 0,40 m e massa M=40 kg.<\/b><\/span><\/span><\/span><\/p>\n

O cubo est\u00e1 preso a uma <\/b><\/span><\/span><\/span>mola ideal<\/b><\/span><\/span><\/span>, de massa desprez\u00edvel, fixada no teto de modo que ele fique <\/b><\/span><\/span><\/span>suspenso no interior do recipiente <\/b><\/span><\/span><\/span>conforme representado no desenho abaixo.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A mola est\u00e1 presa ao cubo no centro de uma de suas faces e o <\/b><\/span><\/span><\/span>peso do cubo <\/b><\/span><\/span><\/span>provoca<\/b><\/span><\/span><\/span><\/p>\n

uma <\/b><\/span><\/span><\/span>deforma\u00e7\u00e3o de 5 cm na mola<\/b><\/span><\/span><\/span>. Em seguida, coloca-se <\/b><\/span><\/span><\/span>\u00e1gua no recipiente <\/b><\/span><\/span><\/span>at\u00e9 que o <\/b><\/span><\/span><\/span>cubo fique em equil\u00edbrio com metade de seu volume submerso<\/b><\/span><\/span><\/span>. Sabendo que a <\/b><\/span><\/span><\/span>densidade da \u00e1gua \u00e9 de 1000 kg\/m<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>, a <\/b><\/span><\/span><\/span>deforma\u00e7\u00e3o da mola <\/b><\/span><\/span><\/span>nesta nova situa\u00e7\u00e3o \u00e9 de:<\/b><\/span><\/span><\/span><\/p>\n

Dado: intensidade da acelera\u00e7\u00e3o da gravidade <\/b><\/span><\/span><\/span>g=10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

A] <\/b><\/span><\/span><\/span>3,0 cm <\/b><\/span><\/span><\/span>[B] <\/b><\/span><\/span><\/span>2,5 cm <\/b><\/span><\/span><\/span>[C] <\/b><\/span><\/span><\/span>2,0 cm <\/b><\/span><\/span><\/span>[D] <\/b><\/span><\/span><\/span>1,5 cm <\/b><\/span><\/span><\/span>[E] <\/b><\/span><\/span><\/span>1,0 cm<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

06-(EsPCEx-AMAN-SP-RJ)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O desenho abaixo representa um <\/b><\/span><\/span><\/span>sistema<\/b><\/span><\/span><\/span> composto por <\/b><\/span><\/span><\/span>cordas e polias ideais de mesmo<\/b><\/span><\/span><\/span><\/p>\n

di\u00e2metro. <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O sistema sustenta um <\/b><\/span><\/span><\/span>bloco<\/b><\/span><\/span><\/span> com <\/b><\/span><\/span><\/span>peso<\/b><\/span><\/span><\/span> de intensidade <\/b><\/span><\/span><\/span>P <\/b><\/span><\/span><\/span>e uma <\/b><\/span><\/span><\/span>barra r\u00edgida AB <\/b><\/span><\/span><\/span>de mate-
\n<\/b><\/span><\/span><\/span>rial homog\u00eaneo de <\/b><\/span><\/span><\/span>comprimento L<\/b><\/span><\/span><\/span>. A <\/b><\/span><\/span><\/span>barra AB tem peso desprez\u00edvel <\/b><\/span><\/span><\/span>e est\u00e1 fixada a uma parede<\/b><\/span><\/span><\/span><\/p>\n

por meio de uma articula\u00e7\u00e3o em <\/b><\/span><\/span><\/span>A.<\/b><\/span><\/span><\/span> Em um <\/b><\/span><\/span><\/span>ponto X<\/b><\/span><\/span><\/span> da barra \u00e9 aplicada uma for\u00e7a de <\/b><\/span><\/span><\/span>intensidade F<\/b><\/span><\/span><\/span><\/p>\n

e na sua extremidade <\/b><\/span><\/span><\/span>B <\/b><\/span><\/span><\/span>est\u00e1 presa uma corda do <\/b><\/span><\/span><\/span>sistema polias-cordas<\/b><\/span><\/span><\/span>. Desprezando as <\/b><\/span><\/span><\/span>for\u00e7as de<\/b><\/span><\/span><\/span><\/p>\n

atrito<\/b><\/span><\/span><\/span>, o valor da <\/b><\/span><\/span><\/span>dist\u00e2ncia AX <\/b><\/span><\/span><\/span>para que a <\/b><\/span><\/span><\/span>for\u00e7a F<\/b><\/span><\/span><\/span> mantenha a <\/b><\/span><\/span><\/span>barra AB em equil\u00edbrio na posi\u00e7\u00e3o<\/b><\/span><\/span><\/span><\/p>\n

horizontal \u00e9<\/b><\/span><\/span><\/span><\/p>\n

[A] <\/b><\/span><\/span><\/span>P.L\/8.F <\/b><\/span><\/span><\/span>[B] <\/b><\/span><\/span><\/span>P.L\/6.F <\/b><\/span><\/span><\/span>[C] <\/b><\/span><\/span><\/span>P.L\/4.F <\/b><\/span><\/span><\/span>[D] <\/b><\/span><\/span><\/span>P.L\/3.F <\/b><\/span><\/span><\/span>[E] <\/b><\/span><\/span><\/span>P.L\/2.F<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O conjunto <\/b><\/span><\/span><\/span>menino-prancha <\/b><\/span><\/span><\/span>possui <\/b><\/span><\/span><\/span>massa de 60 kg<\/b><\/span><\/span><\/span>, e <\/b><\/span><\/span><\/span>parte do repouso do ponto A <\/b><\/span><\/span><\/span>da rampa.<\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>coeficiente de atrito cin\u00e9tico <\/b><\/span><\/span><\/span>entre a prancha e a rampa vale <\/b><\/span><\/span><\/span>0,25 <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>\u03b2 <\/b><\/span><\/span><\/span>\u00e9 o \u00e2ngulo entre a <\/b><\/span><\/span><\/span>horizontal <\/b><\/span><\/span><\/span>e o <\/b><\/span><\/span><\/span>plano da rampa. <\/b><\/span><\/span><\/span>Desprezando a <\/b><\/span><\/span><\/span>resist\u00eancia do ar,<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>varia\u00e7\u00e3o da quantidade de movimento do conjunto menino-prancha entre os pontos A e B <\/b><\/span><\/span><\/span>\u00e9 de<\/b><\/span><\/span><\/span><\/p>\n

Dados: intensidade da acelera\u00e7\u00e3o da gravidade <\/b><\/span><\/span><\/span>g=10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span><\/p>\n

considere o conjunto menino-prancha uma part\u00edcula<\/b><\/span><\/span><\/span><\/p>\n

cos \u03b2 = = 0,8<\/b><\/span><\/span><\/span><\/p>\n

sen \u03b2 = = 0,6<\/b><\/span><\/span><\/span><\/p>\n

[A] <\/b><\/span><\/span><\/span>40\u221a3 N.s <\/b><\/span><\/span><\/span>[B] <\/b><\/span><\/span><\/span>60\u221a3 N.s <\/b><\/span><\/span><\/span>[C] <\/b><\/span><\/span><\/span>70\u221a3 N.s <\/b><\/span><\/span><\/span> [D] <\/b><\/span><\/span><\/span>180\u221a3 N.s <\/b><\/span><\/span><\/span>[E] <\/b><\/span><\/span><\/span>240\u221a3 N.s <\/b><\/span><\/span><\/span><\/p>\n

08-(EsPCEx-AMAN-SP-RJ)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em um <\/b><\/span><\/span><\/span>circuito el\u00e9trico<\/b><\/span><\/span><\/span>, representado no desenho abaixo, o valor da <\/b><\/span><\/span><\/span>for\u00e7a eletromotriz (fem)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

do gerador ideal \u00e9 <\/b><\/span><\/span><\/span>E=1,5 V<\/b><\/span><\/span><\/span>, e os valores das <\/b><\/span><\/span><\/span>resist\u00eancias dos resistores<\/b><\/span><\/span><\/span> \u00f4hmicos s\u00e3o<\/b><\/span><\/span><\/span><\/p>\n

R<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>=R<\/b><\/span><\/span><\/span>4<\/b><\/span><\/span><\/sub><\/span>=0,3 \u2126 , R<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>=R<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sub><\/span>=0,6 \u2126 e R<\/b><\/span><\/span><\/span>5<\/b><\/span><\/span><\/sub><\/span>=0,15 \u2126 <\/b><\/span><\/span><\/span>. As <\/b><\/span><\/span><\/span>leituras<\/b><\/span><\/span><\/span> no <\/b><\/span><\/span><\/span>volt\u00edmetro V e no amper\u00edmetro A<\/b><\/span><\/span><\/span>, ambos<\/b><\/span><\/span><\/span><\/p>\n

ideais<\/b><\/span><\/span><\/span>, s\u00e3o, respectivamente,<\/b><\/span><\/span><\/span><\/p>\n

[A] <\/b><\/span><\/span><\/span>0,375 V e 2,50 A <\/b><\/span><\/span><\/span>[B] <\/b><\/span><\/span><\/span>0,750 V e 1,00 A <\/b><\/span><\/span><\/span>[C] <\/b><\/span><\/span><\/span>0,375 V e 1,25 A <\/b><\/span><\/span><\/span>[D] <\/b><\/span><\/span><\/span>0,750 V e 1,25 A<\/b><\/span><\/span><\/span><\/p>\n

[E] <\/b><\/span><\/span><\/span>0,750 V e 2,50 A<\/b><\/span><\/span><\/span><\/p>\n

09-(EsPCEx-AMAN-SP-RJ)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>trabalhador<\/b><\/span><\/span><\/span> da constru\u00e7\u00e3o civil de <\/b><\/span><\/span><\/span>massa 70 kg<\/b><\/span><\/span><\/span> <\/b>sobe uma escada de material homog\u00eaneo<\/b><\/span><\/span><\/span><\/p>\n

de 5 m de comprimento e massa de 10 kg, <\/b><\/span><\/span><\/span>para consertar o telhado de uma resid\u00eancia.<\/b><\/span><\/span><\/span><\/p>\n

Uma das extremidades da escada est\u00e1 apoiada na <\/b><\/span><\/span><\/span>parede vertical sem atrito no ponto B<\/b><\/span><\/span><\/span>, e a outra extremidade est\u00e1 apoiada sobre um <\/b><\/span><\/span><\/span>piso horizontal no ponto A, que dista 4 m da parede<\/b><\/span><\/span><\/span>, conforme desenho abaixo.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Para que o trabalhador <\/b><\/span><\/span><\/span>fique parado na extremidade da escada que est\u00e1 apoiada no ponto B <\/b><\/span><\/span><\/span>da parede, de modo que a escada <\/b><\/span><\/span><\/span>n\u00e3o deslize e permane\u00e7a em equil\u00edbrio est\u00e1tico na imin\u00eancia do<\/b><\/span><\/span><\/span><\/p>\n

movimento<\/b><\/span><\/span><\/span>, o <\/b><\/span><\/span><\/span>coeficiente de atrito est\u00e1tico entre o piso e a escada dever\u00e1 ser de<\/b><\/span><\/span><\/span><\/p>\n

Dado: intensidade da acelera\u00e7\u00e3o da gravidade <\/b><\/span><\/span><\/span>g=10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span><\/p>\n

[A] <\/b><\/span><\/span><\/span>0,30 <\/b><\/span><\/span><\/span>[B] <\/b><\/span><\/span><\/span>0,60 <\/b><\/span><\/span><\/span>[C] <\/b><\/span><\/span><\/span>0,80 <\/b><\/span><\/span><\/span> [D] <\/b><\/span><\/span><\/span>1,00 <\/b><\/span><\/span><\/span>[E] <\/b><\/span><\/span><\/span>1,25<\/b><\/span><\/span><\/span><\/p>\n

10-(EsPCEx-AMAN-SP-RJ)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma <\/b><\/span><\/span><\/span>crian\u00e7a de massa 25 kg <\/b><\/span><\/span><\/span>brinca em um balan\u00e7o <\/b><\/span><\/span><\/span>cuja haste r\u00edgida <\/b><\/span><\/span><\/span>n\u00e3o deform\u00e1vel e de<\/b><\/span><\/span><\/span><\/p>\n

massa desprez\u00edvel, <\/b><\/span><\/span><\/span>presa ao teto, tem 1,60 m de comprimento<\/b><\/span><\/span><\/span>. Ela executa um <\/b><\/span><\/span><\/span>movimento harm\u00f4nico simples <\/b><\/span><\/span><\/span>que atinge uma <\/b><\/span><\/span><\/span>altura m\u00e1xima de 80 cm em rela\u00e7\u00e3o ao solo<\/b><\/span><\/span><\/span>, conforme representado no desenho abaixo, de forma que o sistema crian\u00e7a mais balan\u00e7o passa a ser considerado como um<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

p\u00eandulo simples <\/b><\/span><\/span><\/span>com centro de massa na extremidade <\/b><\/span><\/span><\/span>P <\/b><\/span><\/span><\/span>da haste. Pode-se afirmar, com<\/b><\/span><\/span><\/span><\/p>\n

rela\u00e7\u00e3o \u00e0 situa\u00e7\u00e3o exposta, que<\/b><\/span><\/span><\/span><\/p>\n

Dados: <\/b><\/span><\/span><\/span>intensidade da acelera\u00e7\u00e3o da gravidade <\/b><\/span><\/span><\/span>g=10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span><\/p>\n

considere o \u00e2ngulo de abertura <\/b><\/span><\/span><\/span>n\u00e3o superior a 10<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span><\/p>\n

[A] <\/b><\/span><\/span><\/span>a amplitude do movimento \u00e9 80 cm.<\/b><\/span><\/span><\/span><\/p>\n

[B] <\/b><\/span><\/span><\/span>a frequ\u00eancia de oscila\u00e7\u00e3o do movimento \u00e9 1,25 Hz.<\/b><\/span><\/span><\/span><\/p>\n

[C] <\/b><\/span><\/span><\/span>o intervalo de tempo para executar uma oscila\u00e7\u00e3o completa \u00e9 de 0,8\u03c0 s.<\/b><\/span><\/span><\/span><\/p>\n

[D] <\/b><\/span><\/span><\/span>a frequ\u00eancia de oscila\u00e7\u00e3o depende da altura atingida pela crian\u00e7a.<\/b><\/span><\/span><\/span><\/p>\n

[E] <\/b><\/span><\/span><\/span>o per\u00edodo do movimento depende da massa da crian\u00e7a<\/b><\/span><\/span><\/span><\/p>\n

 <\/p>\n

Confira a Resolu\u00e7\u00e3o Comentada<\/a><\/span><\/h3>\n","protected":false},"excerpt":{"rendered":"

Para ingressar na AMAN o jovem dever\u00e1 realizar um\u00a0concurso p\u00fablico\u00a0para a\u00a0Escola Preparat\u00f3ria de Cadetes do Ex\u00e9rcito (EsPCEx)\u00a0onde ir\u00e1 cursar um ano de Ensino Superior e, obtendo aproveitamento, seguir\u00e1 para a AMAN. A EsPCEX est\u00e1 localizada na cidade de Campinas – SP. Durante o curso, o jovem estar\u00e1 na condi\u00e7\u00e3o de aluno (isto equivale a uma gradua\u00e7\u00e3o entre as de 2\u00ba<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":5,"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-36","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/36","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=36"}],"version-history":[{"count":3,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/36\/revisions"}],"predecessor-version":[{"id":62,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/36\/revisions\/62"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/5"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=36"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}