{"id":734,"date":"2015-05-12T19:54:29","date_gmt":"2015-05-12T19:54:29","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=734"},"modified":"2024-09-03T13:22:20","modified_gmt":"2024-09-03T13:22:20","slug":"exercicios-resolvidos-uscs-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-resolvidos-uscs-2015\/","title":{"rendered":"Exerc\u00edcios Resolvidos USCS 2015"},"content":{"rendered":"

\"\"<\/p>\n

A<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>Universidade Municipal de S\u00e3o Caetano do Sul<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>(<\/b><\/span><\/span><\/span>USCS<\/b><\/span><\/span><\/span>) \u00e9 uma institui\u00e7\u00e3o de<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>ensino superior<\/b><\/span><\/span><\/span><\/a>\u00a0<\/b><\/span><\/span><\/span>localizada em<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>S\u00e3o Caetano do Sul<\/b><\/span><\/span><\/span><\/a>,<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>Brasil<\/b><\/span><\/span><\/span><\/a>.<\/b><\/span><\/span><\/span><\/p>\n

Anteriormente conhecida como Imes (Instituto Municipal de Ensino Superior), mudou o nome para Universidade Municipal de S\u00e3o Caetano do Sul em dezembro de 2007, mas efetivamente apenas a partir do dia 5 de junho de 2008.<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span><\/a><\/p>\n

A lei municipal n\u00ba 4.581 de<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>S\u00e3o Caetano do Sul<\/b><\/span><\/span><\/span><\/a>\u00a0<\/b><\/span><\/span><\/span>\u00e9 a precursora da mudan\u00e7a do nome da institui\u00e7\u00e3o. A lei adapta a estrutura administrativa do Imes \u00e0 condi\u00e7\u00e3o de<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>universidade<\/b><\/span><\/span><\/span><\/a>. Com isso, a sigla<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>Imes<\/b><\/i><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>que denominava a institui\u00e7\u00e3o foi descartada e substitu\u00edda pela sigla<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>USCS<\/b><\/i><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

Atualmente, a USCS possui duas unidades: uma na avenida Goi\u00e1s e outra na rua Santo Ant\u00f4nio, ambas em<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>S\u00e3o Caetano do Sul<\/b><\/span><\/span><\/span><\/a><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Imagine um<\/b><\/span><\/span><\/span> <\/b>contato radiof\u00f4nico<\/b><\/span><\/span><\/span> <\/b>entre um<\/b><\/span><\/span><\/span> <\/b>terr\u00e1queo na superf\u00edcie da Terra<\/b><\/span><\/span><\/span> <\/b>com um<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

marciano na superf\u00edcie de Marte<\/b><\/span><\/span><\/span>. <\/b><\/span><\/span>Considerando a<\/b><\/span><\/span><\/span> <\/b>velocidade <\/b><\/span><\/span><\/span>das ondas de r\u00e1dio igual \u00e0<\/b><\/span><\/span><\/span> <\/b>da luz (300<\/b><\/span><\/span><\/span> <\/b>000 km\/s)<\/b><\/span><\/span><\/span> e a <\/b><\/span><\/span>dist\u00e2ncia entre a Terra e Marte como sendo igual a 56 milh\u00f5es de quil\u00f4metros<\/b><\/span><\/span><\/span>, o <\/b><\/span><\/span>menor intervalo de tempo<\/b><\/span><\/span><\/span> <\/b>para que um terr\u00e1queo receba a<\/b><\/span><\/span><\/span> <\/b>resposta de uma sauda\u00e7\u00e3o enviada ao marciano,<\/b><\/span><\/span><\/span> <\/b>em <\/b><\/span><\/span><\/span>minutos<\/b><\/span><\/span><\/span>, \u00e9<\/b><\/span><\/span><\/span> <\/b>aproximadamente<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>bloco A de 5 kg<\/b><\/span><\/span><\/span> est\u00e1 apoiado sobre um <\/b><\/span><\/span><\/span>bloco B de 10 kg que,<\/b><\/span><\/span><\/span> por sua vez, est\u00e1 em <\/b><\/span><\/span><\/span>cima de uma plataforma plana, horizontal e sem atrito.<\/b><\/span><\/span><\/span> Uma corda conecta o bloco B a um <\/b><\/span><\/span><\/span>bloco suspenso C de 5 kg<\/b><\/span><\/span><\/span>, passando por uma polia existente entre eles, conforme mostra a <\/b><\/span><\/span><\/span>figura.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considerando a <\/b><\/span><\/span><\/span>corda e a polia ideais<\/b><\/span><\/span><\/span> e a <\/b><\/span><\/span><\/span>acelera\u00e7\u00e3o da gravidade local g = 10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span> , a <\/b><\/span><\/span><\/span>intensidade da for\u00e7a de atrito entre os blocos A e B, em newtons, para que n\u00e3o ocorra deslizamento entre eles \u00e9<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Um bloco de <\/b><\/span><\/span><\/span>massa 100 kg<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>inicialmente em repouso<\/b><\/span><\/span><\/span> no alto de um plano inclinado de <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

20 metros de altura<\/b><\/span><\/span><\/span> <\/b>desliza <\/b><\/span><\/span><\/span>sobre a superf\u00edcie deste plano por <\/b><\/span><\/span><\/span>causa da gravidade<\/b><\/span><\/span><\/span>, cuja acelera\u00e7\u00e3o tem intensidade <\/b><\/span><\/span><\/span>g = 10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>. Se, ap\u00f3s certo <\/b><\/span><\/span><\/span>intervalo de tempo<\/b><\/span><\/span><\/span>, o bloco atinge o <\/b><\/span><\/span><\/span>ponto mais baixo do<\/b><\/span><\/span><\/span> plano inclinado com <\/b><\/span><\/span><\/span>velocidade 10 m\/s,<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>energia dissipada pelo atrito<\/b><\/span><\/span><\/span> existente entre as \u00e1reas de contato <\/b><\/span><\/span><\/span>tem valor, em quilojoules, igual a<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>navio de 90 toneladas<\/b><\/span><\/span><\/span> <\/b>flutua <\/b><\/span><\/span><\/span>sobre as \u00e1guas de um imenso reservat\u00f3rio. Sendo a <\/b><\/span><\/span><\/span>densidade da<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

\u00e1gua <\/b><\/span><\/span><\/span>igual a <\/b><\/span><\/span><\/span>10<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span> kg\/m<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span>, o <\/b><\/span><\/span><\/span>volume de \u00e1gua deslocado pelo navio, em quilolitros<\/b><\/span><\/span><\/span>, \u00e9 (g=10 m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>).<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>anel de cobre<\/b><\/span><\/span><\/span> deve ser encaixado sem folga em um<\/b><\/span><\/span><\/span> disco de alum\u00ednio<\/b><\/span><\/span><\/span>, conforme mostra a <\/b><\/span><\/span><\/span>figura.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Antes <\/b><\/span><\/span><\/span>do encaixe e <\/b><\/span><\/span><\/span>\u00e0 temperatura ambiente,<\/b><\/span><\/span><\/span> o furo do anel possui um <\/b><\/span><\/span><\/span>raio ligeiramente menor<\/b><\/span><\/span><\/span> do que o <\/b><\/span><\/span><\/span>raio do disco.<\/b><\/span><\/span><\/span> Sendo o <\/b><\/span><\/span><\/span>coeficiente de dilata\u00e7\u00e3o t\u00e9rmica linear do alum\u00ednio maior que o do cobre,<\/b><\/span><\/span><\/span> para se <\/b><\/span><\/span><\/span>atingir o objetivo do encaixe, no menor intervalo de varia\u00e7\u00e3o de temperatura, <\/b><\/span><\/span><\/span>deve-se <\/b><\/span><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span><\/span> aquecer apenas o anel de cobre. <\/b><\/span><\/span><\/span><\/p>\n

(B)<\/b><\/span><\/span><\/span> aquecer ambos. <\/b><\/span><\/span><\/span><\/p>\n

(C)<\/b><\/span><\/span><\/span> resfriar apenas o disco de alum\u00ednio. <\/b><\/span><\/span><\/span><\/p>\n

(D)<\/b><\/span><\/span><\/span> aquecer apenas o disco de alum\u00ednio. <\/b><\/span><\/span><\/span><\/p>\n

(E)<\/b><\/span><\/span><\/span> resfriar apenas o anel de cobre.<\/b><\/span><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

Considere uma <\/b><\/span><\/span><\/span>fonte sonora <\/b><\/span><\/span><\/span>emitindo <\/b><\/span><\/span><\/span>ondas esf\u00e9ricas a sua volta, com pot\u00eancia constante <\/b><\/span><\/span><\/span>durante sua propaga\u00e7\u00e3o. Sendo a <\/b><\/span><\/span><\/span>intensidade sonora I<\/b><\/span><\/span><\/span> definida como a raz\u00e3o entre a pot\u00eancia e a \u00e1rea superficial da onda esf\u00e9rica, I = P\/A, pode-se <\/b><\/span><\/span><\/span>afirmar corretamente<\/b><\/span><\/span><\/span> que, a medida que <\/b><\/span><\/span><\/span>se distancia da<\/b><\/span><\/span><\/span> <\/b>fonte,<\/b><\/span><\/span><\/span> o <\/b><\/span><\/span><\/span>som se torna<\/b><\/span><\/span><\/span> <\/b><\/p>\n

(A)<\/b><\/span><\/span><\/span> mais alto e mais grave. <\/b><\/span><\/span><\/span><\/p>\n

(B)<\/b><\/span><\/span><\/span> mais fraco e com frequ\u00eancia constante. <\/b><\/span><\/span><\/span><\/p>\n

(C) <\/b><\/span><\/span><\/span>mais fraco e mais agudo. <\/b><\/span><\/span><\/span><\/p>\n

(D)<\/b><\/span><\/span><\/span> mais baixo e mais grave. <\/b><\/span><\/span><\/span><\/p>\n

(E)<\/b><\/span><\/span><\/span> mais fraco e mais grave.<\/b><\/span><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

A um <\/b><\/span><\/span><\/span>circuito el\u00e9trico residencial<\/b><\/span><\/span><\/span>, submetido a uma <\/b><\/span><\/span><\/span>diferen\u00e7a de potencial igual a 100 V<\/b><\/span><\/span><\/span>, foram associados em <\/b><\/span><\/span><\/span>paralelo uma l\u00e2mpada de resist\u00eancia igual a 100 \u2126, uma torneira el\u00e9trica de 50 \u2126 e um chuveiro el\u00e9trico de 10 \u2126.<\/b><\/span><\/span><\/span> Em certo <\/b><\/span><\/span><\/span>dia<\/b><\/span><\/span><\/span>, observou-se que a <\/b><\/span><\/span><\/span>l\u00e2mpada permaneceu acesa por 5 horas, que a torneira el\u00e9trica foi acionada durante 30 minutos e que o chuveiro el\u00e9trico foi utilizado<\/b><\/span><\/span><\/span> <\/b>por 45 minutos<\/b><\/span><\/span><\/span>. Considerando que cada <\/b><\/span><\/span><\/span>quilowatt-hora custa 20 centavos<\/b><\/span><\/span><\/span>, a despesa <\/b><\/span><\/span><\/span>neste dia<\/b><\/span><\/span><\/span>, em <\/b><\/span><\/span><\/span>centavos, devido ao consumo de energia el\u00e9trica por esses aparelhos foi<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

<\/h2>\n

Confira a resolu\u00e7\u00e3o comentada.<\/span><\/a><\/h2>\n","protected":false},"excerpt":{"rendered":"

A\u00a0Universidade Municipal de S\u00e3o Caetano do Sul\u00a0(USCS) \u00e9 uma institui\u00e7\u00e3o de\u00a0ensino superior\u00a0localizada em\u00a0S\u00e3o Caetano do Sul,\u00a0Brasil. Anteriormente conhecida como Imes (Instituto Municipal de Ensino Superior), mudou o nome para Universidade Municipal de S\u00e3o Caetano do Sul em dezembro de 2007, mas efetivamente apenas a partir do dia 5 de junho de 2008.2 A lei municipal n\u00ba 4.581 de\u00a0S\u00e3o Caetano do<\/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-734","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/734","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=734"}],"version-history":[{"count":2,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/734\/revisions"}],"predecessor-version":[{"id":738,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/734\/revisions\/738"}],"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=734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}