{"id":635,"date":"2015-04-12T14:29:45","date_gmt":"2015-04-12T14:29:45","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=635"},"modified":"2024-09-02T16:51:01","modified_gmt":"2024-09-02T16:51:01","slug":"exercicios-da-puc-rj-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-da-puc-rj-2015\/","title":{"rendered":"Exerc\u00edcios da PUC RJ 2015"},"content":{"rendered":"

 <\/p>\n

\"\"<\/p>\n

Pontif\u00edcia Universidade Cat\u00f3lica do Rio de Janeiro\u00a0(<\/b><\/span><\/span><\/span>PUC-Rio<\/b><\/span><\/span><\/span>) \u00e9 uma institui\u00e7\u00e3o de ensino superior\u00a0privada\u00a0e\u00a0cat\u00f3lica\u00a0brasileira, sediada no\u00a0bairro\u00a0da G\u00e1vea, na\u00a0cidade do\u00a0Rio de Janeiro,\u00a0capital\u00a0do\u00a0estado hom\u00f4nimo,\u00a0Brasil. Nos tempos de hoje, \u00e9 conhecida como a melhor\u00a0universidade privada\u00a0do\u00a0Brasil.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Uma <\/b><\/span><\/span><\/span>massa de 10 g<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span><\/span>velocidade inicial de 5,0 m\/s colide<\/b><\/span><\/span><\/span>, de modo totalmente <\/b><\/span><\/span><\/span>inel\u00e1stico,<\/b><\/span><\/span><\/span> com outra <\/b><\/span><\/span><\/span>massa de 15 g que se encontra inicialmente em repouso.<\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>m\u00f3dulo da velocidade das massas<\/b><\/span><\/span><\/span>, em m\/s, <\/b><\/span><\/span><\/span>ap\u00f3s a colis\u00e3o<\/b><\/span><\/span><\/span> \u00e9:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>p\u00eandulo<\/b><\/span><\/span><\/span> \u00e9 formado por um <\/b><\/span><\/span><\/span>fio ideal de 10 cm de comprimento e uma massa de 20 g<\/b><\/span><\/span><\/span> presa em sua<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

extremidade livre. O p\u00eandulo chega ao <\/b><\/span><\/span><\/span>ponto mais baixo de sua trajet\u00f3ria com uma velocidade escalar de 2,0 m\/s.<\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span><\/span>tra\u00e7\u00e3o no fio<\/b><\/span><\/span><\/span>, em N, quando o p\u00eandulo se encontra <\/b><\/span><\/span><\/span>nesse ponto da trajet\u00f3ria<\/b><\/span><\/span><\/span> \u00e9:<\/b><\/span><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

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

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>astronauta<\/b><\/span><\/span><\/span>, em um <\/b><\/span><\/span><\/span>planeta desconhecido<\/b><\/span><\/span><\/span>, observa que um <\/b><\/span><\/span><\/span>objeto leva 2,0 s para cair<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>partindo do<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

repouso, de uma altura de 12 m.<\/b><\/span><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

Um aluno enche um copo com <\/b><\/span><\/span><\/span>0,10 L de \u00e1gua a 25 \u00b0C e 0,15 L de \u00e1gua a 15 \u00b0C.<\/b><\/span><\/span><\/span> <\/b>Desprezando<\/b><\/span><\/span><\/span> <\/b>trocas<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

de calor<\/b><\/span><\/span><\/span> com o copo e com o meio, a <\/b><\/span><\/span><\/span>temperatura final da mistura<\/b><\/span><\/span><\/span>, em \u00b0C, \u00e9:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Uma <\/b><\/span><\/span><\/span>l\u00e2mpada <\/b><\/span><\/span><\/span>\u00e9 ligada a uma <\/b><\/span><\/span><\/span>bateria de 120 V e dissipa 40,0 W.<\/b><\/span><\/span><\/span> A <\/b><\/span><\/span><\/span>resist\u00eancia dessa l\u00e2mpada, em <\/b><\/span><\/span><\/span>\u2126<\/b><\/span><\/span><\/span>, \u00e9:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Sabendo que a <\/b><\/span><\/span><\/span>velocidade de uma onda eletromagn\u00e9tica em um meio \u00e9 dada por 1,2.10<\/b><\/span><\/span><\/span>8<\/b><\/span><\/span><\/sup><\/span> m\/s,<\/b><\/span><\/span><\/span> qual \u00e9 o<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00edndice de refra\u00e7\u00e3o desse meio?<\/b><\/span><\/span><\/span> Considere: <\/b><\/span><\/span><\/span>velocidade da luz c = 3,0.10<\/b><\/span><\/span><\/span>8<\/b><\/span><\/span><\/sup><\/span> m\/s<\/b><\/span><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span><\/span> 2,5 <\/b><\/span><\/span><\/span>(B)<\/b><\/span><\/span><\/span> 1,2 <\/b><\/span><\/span><\/span>(C)<\/b><\/span><\/span><\/span> 1,8 <\/b><\/span><\/span><\/span>(D)<\/b><\/span><\/span><\/span> 2,0 <\/b><\/span><\/span><\/span>(E)<\/b><\/span><\/span><\/span> 0,4<\/b><\/span><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

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

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

\"\"<\/p>\n

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

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

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

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

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

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

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

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

\"\"<\/p>\n

Em um <\/b><\/span><\/span><\/span>laborat\u00f3rio de eletr\u00f4nica<\/b><\/span><\/span><\/span>, um aluno tem \u00e0 sua disposi\u00e7\u00e3o um <\/b><\/span><\/span><\/span>painel de conex\u00f5es, uma fonte de 12 V e quatro resistores, <\/b><\/span><\/span><\/span>com resist\u00eancias <\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>= 10 \u2126, R<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> =20 \u2126, R<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sub><\/span> = 30 \u2126<\/b><\/span><\/span><\/span> <\/b>e R<\/b><\/span><\/span><\/span>4<\/b><\/span><\/span><\/sub><\/span> = 40 \u2126.<\/b><\/span><\/span><\/span><\/b><\/p>\n

Para armar os <\/b><\/span><\/span><\/span>circuitos dos itens abaixo<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>ele pode usar<\/b><\/span><\/span><\/span> <\/b>combina\u00e7\u00f5es em s\u00e9rie e\/ou paralelo de alguns ou todos os resistores dispon\u00edveis<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

a)<\/b><\/span><\/span><\/span> <\/b>Sua <\/b><\/span><\/span><\/span>primeira tarefa \u00e9 armar um circuito tal que a intensidade de corrente fornecida pela fonte seja de 0,8 A. Fa\u00e7a um esquema deste circuito. Justifique.<\/b><\/span><\/span><\/span><\/p>\n

b)<\/b><\/span><\/span><\/span> <\/b>Agora o <\/b><\/span><\/span><\/span>circuito deve ter a m\u00e1xima intensidade de corrente poss\u00edvel fornecida pela fonte. Fa\u00e7a um esquema do circuito.<\/b><\/span><\/span><\/span><\/p>\n

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

c) <\/b><\/span><\/span><\/span>Qual \u00e9 o valor da intensidade de corrente do item b?<\/b><\/span><\/span><\/span><\/p>\n

 <\/p>\n

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

  Pontif\u00edcia Universidade Cat\u00f3lica do Rio de Janeiro\u00a0(PUC-Rio) \u00e9 uma institui\u00e7\u00e3o de ensino superior\u00a0privada\u00a0e\u00a0cat\u00f3lica\u00a0brasileira, sediada no\u00a0bairro\u00a0da G\u00e1vea, na\u00a0cidade do\u00a0Rio de Janeiro,\u00a0capital\u00a0do\u00a0estado hom\u00f4nimo,\u00a0Brasil. Nos tempos de hoje, \u00e9 conhecida como a melhor\u00a0universidade privada\u00a0do\u00a0Brasil. 01-(PUC-RJ-015) Uma massa de 10 g e velocidade inicial de 5,0 m\/s colide, de modo totalmente inel\u00e1stico, com outra massa de 15 g que se encontra inicialmente em<\/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-635","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/635","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=635"}],"version-history":[{"count":2,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/635\/revisions"}],"predecessor-version":[{"id":640,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/635\/revisions\/640"}],"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=635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}