{"id":87,"date":"2014-11-18T12:32:53","date_gmt":"2014-11-18T12:32:53","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=87"},"modified":"2024-09-02T16:39:07","modified_gmt":"2024-09-02T16:39:07","slug":"exercicios-da-afa-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-da-afa-2015\/","title":{"rendered":"Exerc\u00edcios da AFA 2015"},"content":{"rendered":"

\"\"<\/p>\n

Academia da For\u00e7a A\u00e9rea <\/b><\/span><\/span><\/span>(AFA)<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>\u00e9 um estabelecimento de ensino em n\u00edvel superior da<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>For\u00e7a A\u00e9rea Brasileira<\/a>,<\/b><\/span><\/span><\/span>situado em\u00a0<\/b><\/span><\/span><\/span>Pirassununga<\/a>,\u00a0Estado de S\u00e3o Paulo<\/a><\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>e reconhecido pelo\u00a0Minist\u00e9rio da Educa\u00e7\u00e3o<\/a>. Integra o sistema de <\/b><\/span><\/span><\/span>forma\u00e7\u00e3o e aperfei\u00e7oamento <\/b><\/span><\/span><\/span>de pessoal do<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>Comando da Aeron\u00e1utica<\/a>\u00a0(COMAER)<\/b><\/span><\/span><\/span>e est\u00e1 subordinada ao Departamento de Ensino <\/b><\/span><\/span><\/span>(DEPENS) da\u00a0For\u00e7a A\u00e9rea Brasileira<\/a>\u00a0(FAB<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span>Tem como finalidade a forma\u00e7\u00e3o de oficiais da ativa para os quadros de <\/b><\/span><\/span><\/span>aviadores,<\/b><\/span><\/span><\/span>intendentes<\/b><\/span><\/span><\/span><\/a>\u00a0e de infantaria da FAB.<\/b><\/span><\/span><\/span><\/p>\n

\u00c9 considerada uma das tr\u00eas melhores escolas de forma\u00e7\u00e3o de pilotos militares do mundo <\/b><\/span><\/span><\/span>eforma n\u00e3o apenas <\/b><\/span><\/span><\/span>pilotos militares para a For\u00e7a A\u00e9rea Brasileira<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>como tamb\u00e9m para <\/b><\/span><\/span><\/span>For\u00e7as A\u00e9reas de pa\u00edses da Am\u00e9rica Latina, \u00c1frica, \u00c1sia e Europa, mediante acordos internacionais de coopera\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

O<\/b><\/span><\/span><\/span>ingresso na AFA ocorre mediante a aprova\u00e7\u00e3o em concursos p\u00fablicos anuais de admiss\u00e3o, de \u00e2mbito nacional<\/b><\/span><\/span><\/span>. <\/b><\/span><\/span><\/span>As<\/b><\/span><\/span><\/span>informa\u00e7\u00f5es<\/b><\/span><\/span><\/span>sobre esses concursos est\u00e3o <\/b><\/span><\/span><\/span>dispon\u00edveis<\/b><\/span><\/span><\/span>em todas as <\/b><\/span><\/span><\/span>organiza\u00e7\u00f5es do Comando da Aeron\u00e1utica<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

Atualmente, a Academia forma <\/b><\/span><\/span><\/span>cadetes dos seguintes cursos:<\/b><\/span><\/span><\/span><\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span>Curso de Forma\u00e7\u00e3o de Oficiais de Infantaria da Aeron\u00e1utica (CFOINF)<\/b><\/span><\/span><\/span><\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span>Curso de Forma\u00e7\u00e3o de Oficiais Aviadores (CFOAV)<\/b><\/span><\/span><\/span><\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span>Curso de Forma\u00e7\u00e3o de Oficiais Intendentes (CFOINT).<\/b><\/span><\/span><\/span><\/p>\n

Al\u00e9m disso<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>todos os cadetes da Academia<\/b><\/span><\/span><\/span>, ao final do curso, recebem o<\/b><\/span><\/span><\/span>t\u00edtulo de bachar\u00e9is em Administra\u00e7\u00e3o, com \u00eanfase em\u00a0Administra\u00e7\u00e3o P\u00fablica<\/a><\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

Um <\/b><\/span><\/span>caminh\u00e3o de <\/b><\/span><\/span><\/span>20 m de comprimento <\/b><\/span><\/span><\/span>se movimenta ao longo de uma estrada retil\u00ednea e o <\/b><\/span><\/span>registro<\/b><\/span><\/span><\/span> de sua <\/b><\/span><\/span>posi\u00e7\u00e3o x,em quil\u00f4metros, em fun\u00e7\u00e3o do tempo t, em segundos, \u00e9 apresentado no gr\u00e1fico abaixo. <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Do <\/b><\/span><\/span>instante inicial <\/b><\/span><\/span><\/span>do movimento, <\/b><\/span><\/span>t=0, at\u00e9 o tempo t<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>, o caminh\u00e3o, <\/b><\/span><\/span>partindo do repouso<\/b><\/span><\/span><\/span>, desloca-se em movimento <\/b><\/span><\/span>retil\u00edneo uniformemente variado<\/b><\/span><\/span><\/span>. A partir desse tempo <\/b><\/span><\/span>t<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>,<\/b><\/span><\/span><\/span> no entanto, o caminh\u00e3o <\/b><\/span><\/span>inicia a travessia de uma ponte retil\u00ednea de <\/b><\/span><\/span><\/span>380 metros de extens\u00e3o <\/b><\/span><\/span><\/span>mantendo <\/b><\/span><\/span>velocidade constante<\/b><\/span><\/span><\/span><\/p>\n

at\u00e9 que a atravesse <\/b><\/span><\/span><\/span>completamente no tempo t<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>= 120s . <\/b><\/span><\/span><\/span><\/p>\n

Considere que, <\/b><\/span><\/span>durante a travessia<\/b><\/span><\/span><\/span>, o caminh\u00e3o emita um <\/b><\/span><\/span>sinal sonoro de frequ\u00eancia constante igual a 160 Hz <\/b><\/span><\/span><\/span>e que esse sinal se propague com <\/b><\/span><\/span>velocidade de 340 m\/s pelo ar<\/b><\/span><\/span><\/span>, o qual se encontra em repouso em rela\u00e7\u00e3o \u00e0 terra. <\/b><\/span><\/span><\/p>\n

Nessas condi\u00e7\u00f5es, um <\/b><\/span><\/span>observador <\/b><\/span><\/span><\/span>parado no final da ponte <\/b><\/span><\/span><\/span>ouvir\u00e1 o sinal sonoro emitido pelo <\/b><\/span><\/span><\/span>caminh\u00e3o que se aproxima com uma frequ\u00eancia, em hertz<\/b><\/span><\/span><\/span>, dada por<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>170 <\/b><\/span><\/span>b) <\/b><\/span><\/span><\/span>180 <\/b><\/span><\/span>c) <\/b><\/span><\/span><\/span>190 b) <\/b><\/span><\/span>d)<\/b><\/span><\/span><\/span> 200 <\/b><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

Uma <\/b><\/span><\/span>determinada caixa<\/b><\/span><\/span><\/span>\u00e9 transportada em um <\/b><\/span><\/span>caminh\u00e3o<\/b><\/span><\/span><\/span>que percorre, com <\/b><\/span><\/span>velocidade escalar constante<\/b><\/span><\/span><\/span>, uma estrada <\/b><\/span><\/span>plana e horizontal<\/b><\/span><\/span><\/span>. Em um determinado instante, o caminh\u00e3o entra em uma<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

curva circular de raio igual a 51,2 m<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span>mantendo a mesma velocidade escalar<\/b><\/span><\/span><\/span>. Sabendo-se que os <\/b><\/span><\/span><\/p>\n

coeficientes de atrito cin\u00e9tico e est\u00e1tico entre a caixa e o assoalho horizontal s\u00e3o, respectivamente<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span>0,4 e 0,5 <\/b><\/span><\/span><\/span>e considerando que as dimens\u00f5es do caminh\u00e3o, em rela\u00e7\u00e3o ao raio da curva, s\u00e3o desprez\u00edveis e que a <\/b><\/span><\/span>caixa esteja apoiada apenas no assoalho da carroceria<\/b><\/span><\/span><\/span>, pode-se afirmar <\/b><\/span><\/span><\/p>\n

que a <\/b><\/span><\/span>m\u00e1xima velocidade, em m\/s<\/b><\/span><\/span><\/span>, que o caminh\u00e3o poder\u00e1 desenvolver, <\/b><\/span><\/span><\/span>sem que a caixa escorregue <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>14,3 <\/b><\/span><\/span>b) <\/b><\/span><\/span><\/span>16,0 <\/b><\/span><\/span>c) <\/b><\/span><\/span><\/span>18,0 <\/b><\/span><\/span>d) <\/b><\/span><\/span><\/span>21,5<\/b><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

Considere <\/b><\/span><\/span>duas rampas A e B, respectivamente de massas 1 kg e 2 kg<\/b><\/span><\/span><\/span>, em <\/b><\/span><\/span>forma de quadrantes de circunfer\u00eancia de <\/b><\/span><\/span><\/span>raios iguais a 10 m<\/b><\/span><\/span><\/span>, apoiadas em um <\/b><\/span><\/span>plano horizontal e sem atrito<\/b><\/span><\/span><\/span>. <\/b><\/span><\/span>Duas esferas <\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span><\/span>2 <\/b><\/span><\/span><\/span>se encontram, respectivamente, <\/b><\/span><\/span>no topo das rampas <\/b><\/span><\/span><\/span>A e B <\/b><\/span><\/span><\/span>e s\u00e3o abandonadas, do <\/b><\/span><\/span><\/span>repouso<\/b><\/span><\/span><\/span>, em <\/b><\/span><\/span><\/p>\n

um dado instante, conforme figura abaixo. <\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Quando as <\/b><\/span><\/span>esferas perdem contato com as rampas<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span>estas<\/b><\/span><\/span><\/span> se <\/b><\/span><\/span><\/span>movimentam<\/b><\/span><\/span><\/span> conforme os gr\u00e1ficos de suas posi\u00e7\u00f5es x, em metros, em fun\u00e7\u00e3o do tempo t, em segundos, abaixo representados<\/b><\/span><\/span><\/span>. <\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Desprezando qualquer tipo de atrito<\/b><\/span><\/span><\/span>, a <\/b><\/span><\/span>raz\u00e3o m<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>\/m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>das massas m<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> e m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> das esferas <\/b><\/span><\/span><\/span>1 e 2<\/b><\/span><\/span><\/span>, respectivamente, \u00e9<\/b><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>1\/2 <\/b><\/span><\/span>b) <\/b><\/span><\/span><\/span>1 <\/b><\/span><\/span>c) <\/b><\/span><\/span><\/span>2 <\/b><\/span><\/span>d) <\/b><\/span><\/span><\/span>3\/2<\/b><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

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

\"\"<\/p>\n

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

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

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

a) <\/b><\/span><\/span><\/span>4 e 2.10<\/b><\/span><\/span>4 <\/b><\/span><\/span><\/sup>b) <\/b><\/span><\/span><\/span>4 e 5.10<\/b><\/span><\/span>3 <\/b><\/span><\/span><\/sup>c) <\/b><\/span><\/span><\/span>16 e 2.10<\/b><\/span><\/span>4 <\/b><\/span><\/span><\/sup>d) <\/b><\/span><\/span><\/span>16 e 125.10<\/b><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/p>\n

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

\"\"<\/p>\n

Com rela\u00e7\u00e3o \u00e0 <\/b><\/span><\/span><\/span>dilata\u00e7\u00e3o dos s\u00f3lidos e l\u00edquidos <\/b><\/span><\/span><\/span>isotr\u00f3picos, analise as proposi\u00e7\u00f5es a seguir e d\u00ea como resposta a <\/b><\/span><\/span><\/span>soma dos n\u00fameros associados <\/b><\/span><\/span><\/span>\u00e0s afirma\u00e7\u00f5es corretas. <\/b><\/span><\/span><\/span><\/p>\n

(01) <\/b><\/span><\/span><\/span>Um recipiente com <\/b><\/span><\/span>dilata\u00e7\u00e3o desprez\u00edvel <\/b><\/span><\/span><\/span>cont\u00e9m certa massa de \u00e1gua na <\/b><\/span><\/span>temperatura de1\u00b0C<\/b><\/span><\/span><\/span>, quando \u00e9, ent\u00e3o, <\/b><\/span><\/span>aquecido lentamente, sofrendo uma varia\u00e7\u00e3o de temperatura <\/b><\/span><\/span><\/span>de 6 \u00b0C<\/b><\/span><\/span><\/span>. Nesse caso, o <\/b><\/span><\/span>volume da \u00e1gua primeiro aumenta e depois diminui. <\/b><\/span><\/span><\/span><\/p>\n

(02) <\/b><\/span><\/span><\/span>Quando se <\/b><\/span><\/span>aquece uma placa met\u00e1lica que apresenta um <\/b><\/span><\/span><\/span>orif\u00edcio<\/b><\/span><\/span><\/span>, verifica-se que, com a <\/b><\/span><\/span>dilata\u00e7\u00e3o da placa, a \u00e1rea do orif\u00edcio aumenta. <\/b><\/span><\/span><\/span><\/p>\n

(03) <\/b><\/span><\/span><\/span>Quando um <\/b><\/span><\/span>frasco completamente cheio de l\u00edquido \u00e9 aquecido, este <\/b><\/span><\/span><\/span>transborda um pouco<\/b><\/span><\/span><\/span>. O <\/b><\/span><\/span>volume<\/b><\/span><\/span><\/span> de l\u00edquido transbordado <\/b><\/span><\/span>mede a dilata\u00e7\u00e3o absoluta do l\u00edquido. <\/b><\/span><\/span><\/span><\/p>\n

(04) <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span>vidro pirex <\/b><\/span><\/span><\/span>apresenta <\/b><\/span><\/span>maior resist\u00eancia ao choque t\u00e9rmico <\/b><\/span><\/span><\/span>do que o <\/b><\/span><\/span>vidro comum <\/b><\/span><\/span><\/span>porque tem <\/b><\/span><\/span>menor coeficiente de dilata\u00e7\u00e3o t\u00e9rmica do que o vidro comum. <\/b><\/span><\/span><\/span><\/p>\n

(<\/b><\/span><\/span>05)<\/b><\/span><\/span><\/span> Sob press\u00e3o normal, quando uma <\/b><\/span><\/span>massa de \u00e1gua \u00e9 aquecida de0 \u00b0C at\u00e9 100 \u00b0C<\/b><\/span><\/span><\/span>sua densidade sempre aumenta. <\/b><\/span><\/span><\/span><\/p>\n

(06) <\/b><\/span><\/span><\/span>Ao se <\/b><\/span><\/span>elevar a temperatura de um sistema constitu\u00eddo por tr\u00eas barras retas e id\u00eanticas de ferro <\/b><\/span><\/span><\/span>interligadas de modo a <\/b><\/span><\/span>formarem um tri\u00e2ngulo is\u00f3sceles, os \u00e2ngulos internos desse tri\u00e2ngulo n\u00e3o se alteram. <\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>07 <\/b><\/span><\/span>b)<\/b><\/span><\/span><\/span> 10 <\/b><\/span><\/span>c) <\/b><\/span><\/span><\/span>11 <\/b><\/span><\/span>d)<\/b><\/span><\/span><\/span> 12<\/b><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

Uma <\/b><\/span><\/span>amostra de <\/b><\/span><\/span><\/span>n mols<\/b><\/span><\/span><\/span> de g\u00e1s ideal <\/b><\/span><\/span><\/span>sofre as transforma\u00e7\u00f5es <\/b><\/span><\/span>AB (isovolum\u00e9trica<\/b><\/span><\/span><\/span>), <\/b><\/span><\/span>BC (isob\u00e1rica)<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span>CD (isot\u00e9rmica)<\/b><\/span><\/span><\/span> conforme representa\u00e7\u00e3o no <\/b><\/span><\/span>diagrama press\u00e3o (p) x volume (V), mostrado a seguir.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

Sabendo-se que a <\/b><\/span><\/span>temperatura do g\u00e1s no estado A \u00e9 27 \u00b0C <\/b><\/span><\/span><\/span>, pode-se afirmar que a <\/b><\/span><\/span>temperatura dele, <\/b><\/span><\/span><\/span>em \u00b0C, no estado D \u00e9<\/b><\/span><\/span><\/span> <\/b><\/p>\n

a)<\/b><\/span><\/span><\/span> 108 <\/b><\/span><\/span>b) <\/b><\/span><\/span><\/span>327 <\/b><\/span><\/span>c)<\/b><\/span><\/span><\/span> 628 <\/b><\/span><\/span> d)<\/b><\/span><\/span><\/span> 927<\/b><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

Uma <\/b><\/span><\/span>onda estacion\u00e1ria<\/b><\/span><\/span><\/span> \u00e9 estabelecida em uma <\/b><\/span><\/span>corda homog\u00eanea de comprimento <\/b><\/span><\/span><\/span>2\u03c0m,<\/b><\/span><\/span><\/span> presa pelas extremidades, <\/b><\/span><\/span>A e B,<\/b><\/span><\/span><\/span> conforme figura abaixo. <\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considere que a <\/b><\/span><\/span>corda esteja submetida a uma<\/b><\/span><\/span><\/span> <\/b>tens\u00e3o de 10 N<\/b><\/span><\/span><\/span> e que sua <\/b><\/span><\/span>densidade linear de massa<\/b><\/span><\/span><\/span> <\/b>seja igual a 1,0 kg\/m.<\/b><\/span><\/span><\/span><\/p>\n

Nessas condi\u00e7\u00f5es, a op\u00e7\u00e3o que <\/b><\/span><\/span>apresenta um sistema <\/b><\/span><\/span><\/span>massa-mola<\/b><\/span><\/span><\/span> ideal, de <\/b><\/span><\/span><\/span>constante el\u00e1stica k<\/b><\/span><\/span><\/span>, em<\/b><\/span><\/span><\/span> <\/b>N\/m <\/b><\/span><\/span><\/span>e massa m<\/b><\/span><\/span><\/span> , em kg , que oscila em movimento harm\u00f4nico simples<\/b><\/span><\/span><\/span> na vertical com a <\/b><\/span><\/span>mesma frequ\u00eancia da onda estacion\u00e1ria considerada \u00e9<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Em um <\/b><\/span><\/span>chuveiro el\u00e9trico<\/b><\/span><\/span><\/span>, submetido a uma <\/b><\/span><\/span>tens\u00e3o el\u00e9trica constante de 110 V<\/b><\/span><\/span><\/span>, s\u00e3o dispostas <\/b><\/span><\/span>quatro resist\u00eancias \u00f4hmicas<\/b><\/span><\/span><\/span>, conforme figura abaixo. <\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Faz-se passar pelas resist\u00eancias um <\/b><\/span><\/span>fluxo de \u00e1gua, a uma mesma temperatura<\/b><\/span><\/span><\/span>, com uma <\/b><\/span><\/span>vaz\u00e3o constante de 1,32 litros por minuto. <\/b><\/span><\/span><\/span><\/p>\n

Considere que a <\/b><\/span><\/span>\u00e1gua <\/b><\/span><\/span><\/span>tenha densidade de <\/b><\/span><\/span>1,0 g\/cm<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span> e <\/b><\/span><\/span>calor espec\u00edfico 1,0 cal\/g<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>C<\/b><\/span><\/span><\/span>, que <\/b><\/span><\/span>1cal = 4J<\/b><\/span><\/span><\/span> e que <\/b><\/span><\/span>toda energia el\u00e9trica fornecida ao chuveiro seja convertida em calor para aquecer, homogeneamente, a \u00e1gua. <\/b><\/span><\/span><\/span><\/p>\n

Nessas condi\u00e7\u00f5es, a <\/b><\/span><\/span>varia\u00e7\u00e3o de temperatura da \u00e1gua, em \u00b0C,<\/b><\/span><\/span><\/span> ao passar pelas resist\u00eancias \u00e9 <\/b><\/span><\/span><\/p>\n

a)<\/b><\/span><\/span><\/span> 25 <\/b><\/span><\/span>b) <\/b><\/span><\/span><\/span>28 <\/b><\/span><\/span>c)<\/b><\/span><\/span><\/span> 30 <\/b><\/span><\/span>d)<\/b><\/span><\/span><\/span> 35 <\/b><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Duas grandes placas met\u00e1licas id\u00eanticas, <\/b><\/span><\/span><\/span>P<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> e P<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>,<\/b><\/span><\/span><\/span> s\u00e3o <\/b><\/span><\/span>fixadas na face dianteira de dois carrinhos<\/b><\/span><\/span><\/span>, de <\/b><\/span><\/span>mesma massa, A e B<\/b><\/span><\/span><\/span>. <\/b><\/span><\/span><\/p>\n

Essas duas placas <\/b><\/span><\/span>s\u00e3o carregadas eletricamente<\/b><\/span><\/span><\/span>, constituindo, assim, um <\/b><\/span><\/span>capacitor plano de placas paralelas. <\/b><\/span><\/span><\/span><\/p>\n

Lan\u00e7am-se, simultaneamente, em <\/b><\/span><\/span><\/span>sentidos opostos, os carrinhos A e B<\/b><\/span><\/span><\/span>, conforme indicado na <\/b><\/span><\/span>figura abaixo. <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Desprezadas quaisquer resist\u00eancias<\/b><\/span><\/span><\/span> ao movimento do sistema e considerando que as placas est\u00e3o <\/b><\/span><\/span>eletricamente isoladas<\/b><\/span><\/span><\/span>, o <\/b><\/span><\/span>gr\u00e1fico que melhor representa a ddp, U, no capacitor, em fun\u00e7\u00e3o do tempo t, contado a partir do lan\u00e7amento \u00e9 <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Desejando-se determinar a <\/b><\/span><\/span>intensidade do campo magn\u00e9tico no interior de um solenoide longo<\/b><\/span><\/span><\/span> percorrido por uma <\/b><\/span><\/span>corrente el\u00e9trica constante<\/b><\/span><\/span><\/span>, um professor de f\u00edsica construiu um aparato experimental que consistia, <\/b><\/span><\/span>al\u00e9m do solen\u00f3ide, de uma balan\u00e7a de bra\u00e7os isolantes e iguais a <\/b><\/span><\/span><\/span>d<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span><\/p>\n

e <\/b><\/span><\/span><\/span>d<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>, sendo que o <\/b><\/span><\/span>prato em uma das extremidades foi substitu\u00eddo por uma <\/b><\/span><\/span><\/span>espira quadrada de lado L,<\/b><\/span><\/span><\/span> conforme indicado na figura abaixo. <\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Quando <\/b><\/span><\/span>n\u00e3o circula<\/b><\/span><\/span><\/span> corrente na espira, a balan\u00e7a se encontra <\/b><\/span><\/span>em equil\u00edbrio<\/b><\/span><\/span><\/span> e o <\/b><\/span><\/span>plano da espira est\u00e1<\/b><\/span><\/span><\/span> <\/b>na horizontal.<\/b><\/span><\/span><\/span> Ao fazer passar pela espira uma <\/b><\/span><\/span>corrente el\u00e9trica constante i,<\/b><\/span><\/span><\/span> o <\/b><\/span><\/span>equil\u00edbrio da balan\u00e7a \u00e9<\/b><\/span><\/span><\/span> <\/b>restabelecido ao colocar no prato uma <\/b><\/span><\/span><\/span>massa m<\/b><\/span><\/span><\/span> . Sendo <\/b><\/span><\/span>g o m\u00f3dulo do campo gravitacional local<\/b><\/span><\/span><\/span>, o <\/b><\/span><\/span>campo magn\u00e9tico no interior do solenoide \u00e9 dado pela express\u00e3o<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

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

Academia da For\u00e7a A\u00e9rea (AFA)\u00a0\u00e9 um estabelecimento de ensino em n\u00edvel superior da\u00a0For\u00e7a A\u00e9rea Brasileira,situado em\u00a0Pirassununga,\u00a0Estado de S\u00e3o Paulo\u00a0e reconhecido pelo\u00a0Minist\u00e9rio da Educa\u00e7\u00e3o. Integra o sistema de forma\u00e7\u00e3o e aperfei\u00e7oamento de pessoal do\u00a0Comando da Aeron\u00e1utica\u00a0(COMAER)e est\u00e1 subordinada ao Departamento de Ensino (DEPENS) da\u00a0For\u00e7a A\u00e9rea Brasileira\u00a0(FAB.Tem como finalidade a forma\u00e7\u00e3o de oficiais da ativa para os quadros de aviadores,intendentes\u00a0e de infantaria<\/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-87","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/87","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=87"}],"version-history":[{"count":3,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/87\/revisions"}],"predecessor-version":[{"id":10990,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/87\/revisions\/10990"}],"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=87"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}