{"id":277,"date":"2014-12-13T20:25:33","date_gmt":"2014-12-13T20:25:33","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=277"},"modified":"2024-09-02T16:40:10","modified_gmt":"2024-09-02T16:40:10","slug":"exercicios-da-cederj-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-da-cederj-2015\/","title":{"rendered":"Exerc\u00edcios da CEDERJ 2015"},"content":{"rendered":"

\"\"<\/p>\n

(<\/span><\/span><\/span>CEDERJ-RJ)<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>– <\/b><\/span><\/span>Centro de Ci\u00eancias e Educa\u00e7\u00e3o Superior a Dist\u00e2ncia do Estado do Rio de Janeiro<\/b><\/span><\/span><\/span><\/p>\n

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

Contribuir para a interioriza\u00e7\u00e3o do ensino superior p\u00fablico, gratuito e de qualidade no Estado do Rio de Janeiro por meio da oferta de cursos de gradua\u00e7\u00e3o a dist\u00e2ncia, na modalidade semipresencial, garantindo a qualidade destes no que diz respeito ao processo de avalia\u00e7\u00e3o de aprendizagem.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

CEDERJ-RJ-015<\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Um m\u00fasico, sentado ao lado dotocador de vinil, observa o disco girando \u00e0<\/b><\/span><\/span><\/span>velocidade angular<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

constante.<\/b><\/span><\/span><\/span>Assinalea alternativa<\/b><\/span><\/span><\/span> que representa,<\/b><\/span><\/span><\/span>esquematicamente, como o m\u00f3dulo davelocidade (<\/b><\/span><\/span><\/span>v<\/b><\/i><\/span><\/span><\/span>) de um ponto da superf\u00edciedo disco, conforme observada pelo m\u00fasico, varia emfun\u00e7\u00e3o da sua dist\u00e2ncia (<\/b><\/span><\/span><\/span>r<\/b><\/i><\/span><\/span><\/span>) ao centro do disco.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

As <\/b><\/span><\/span><\/span>extremidades<\/b><\/span><\/span><\/span> de um <\/b><\/span><\/span><\/span>peda\u00e7o de fio decomprimento L<\/b><\/span><\/span><\/span> s\u00e3o conectadas aos terminais de uma<\/b><\/span><\/span><\/span>bateria ideal.<\/b><\/span><\/span><\/span> Verifica-se que a <\/b><\/span><\/span><\/span>corrente el\u00e9trica a qualpercorre o fio \u00e9, nesse caso, i<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span> O peda\u00e7o<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

original \u00e9substitu\u00eddo por outro, do <\/b><\/span><\/span><\/span>mesmo fio,<\/b><\/span><\/span><\/span> por\u00e9m com o <\/b><\/span><\/span><\/span>dobrodo comprimento<\/b><\/span><\/span><\/span>. Ap\u00f3s a substitui\u00e7\u00e3o, verifica-se que, soba <\/b><\/span><\/span><\/span>mesma voltagem, a corrente que o percorre \u00e9 i<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>. Assinale<\/b><\/span><\/span><\/span><\/p>\n

a alternativa que descreve a <\/b><\/span><\/span><\/span>rela\u00e7\u00e3o entre as correntes i<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>e i<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

Dois blocos de massas m<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> e m<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> s\u00e3o abandonados<\/b><\/span><\/span><\/span>simultaneamente, de uma <\/b><\/span><\/span><\/span>mesma altura h<\/b><\/span><\/span><\/span>, sobre <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

assuperf\u00edcies de <\/b><\/span><\/span><\/span>doisplanos inclinadosdistintos<\/b><\/span><\/span><\/span>, dispostossobre uma basehorizontal, comoilustra a figura. Osblocos <\/b><\/span><\/span><\/span>deslizam sem atrito at\u00e9atingirem a base.<\/b><\/span><\/span><\/span> Assinalea <\/b><\/span><\/span><\/span>alternativa que representa as rela\u00e7\u00f5es entre os m\u00f3dulosv<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> e v<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> das velocidades com que cada um dos blocoschega \u00e0 base, bem como as rela\u00e7\u00f5es entre os tempos t<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>e t<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> que eles levam para isto, respectivamente<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>luz \u00e9 refratada<\/b><\/span><\/span><\/span> quando <\/b><\/span><\/span><\/span>passa do ar para o vidro.<\/b><\/span><\/span><\/span> Quando <\/b><\/span><\/span><\/span>entra no vidro<\/b><\/span><\/span><\/span>, o <\/b><\/span><\/span><\/span>raio de luz incidente <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

aproxima-se da dire\u00e7\u00e3o normal \u00e0 superf\u00edcie porque<\/b><\/span><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span><\/span> <\/b>a <\/b><\/span><\/span><\/span>frequ\u00eancia<\/b><\/span><\/span><\/span> da luz <\/b><\/span><\/span><\/span>no ar \u00e9 maior do que no vidro.<\/b><\/span><\/span><\/span><\/p>\n

(B)<\/b><\/span><\/span><\/span> <\/b>a <\/b><\/span><\/span><\/span>frequ\u00eancia <\/b><\/span><\/span><\/span>da luz <\/b><\/span><\/span><\/span>no ar \u00e9 menor do que no vidro.<\/b><\/span><\/span><\/span><\/p>\n

(C)<\/b><\/span><\/span><\/span> <\/b>a <\/b><\/span><\/span><\/span>velocidade<\/b><\/span><\/span><\/span> da luz no <\/b><\/span><\/span><\/span>ar \u00e9 maior do que no vidro.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

(D)<\/b><\/span><\/span><\/span> <\/b>a <\/b><\/span><\/span><\/span>velocidade<\/b><\/span><\/span><\/span> da luz no <\/b><\/span><\/span><\/span>ar \u00e9 menor do que no vidro.<\/b><\/span><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

Dois blocos <\/b><\/span><\/span><\/span>id\u00eanticos, A e B<\/b><\/span><\/span><\/span>, s\u00e3o justapostos sobre uma mesa horizontal, <\/b><\/span><\/span><\/span>M.<\/b><\/span><\/span><\/span> Os dois blocos est\u00e3o conectados por um fio inextens\u00edvel o qual passa por uma roldana que est\u00e1 fixada em uma parede <\/b><\/span><\/span><\/span><\/p>\n

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vertical e que pode <\/b><\/span><\/span><\/span>girar livremente em torno do seu eixo<\/b><\/span><\/span><\/span>. O bloco <\/b><\/span><\/span><\/span>B <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>puxado <\/b><\/span><\/span><\/span>por uma <\/b><\/span><\/span><\/span>for\u00e7a horizontal, <\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/span>, e desliza sobre a mesa, enquanto o bloco A desliza sobre o B.<\/b><\/span><\/span><\/span> Os <\/b><\/span><\/span><\/span>coeficientes de<\/b><\/span><\/span><\/span> <\/b>atrito cin\u00e9tico<\/b><\/span><\/span><\/span> entre as superf\u00edcies dos dois blocos e entre a superf\u00edcie da mesa e o bloco B <\/b><\/span><\/span><\/span>s\u00e3o id\u00eanticos.<\/b><\/span><\/span><\/span> Assinale a alternativa que representa as <\/b><\/span><\/span><\/span>for\u00e7as de atrito, F<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> e F<\/b><\/span><\/span><\/span>M<\/b><\/span><\/span><\/sub><\/span> , exercidas pelo bloco A e pela mesa M sobre o bloco B.<\/b><\/span><\/span><\/span><\/p>\n

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

ENGENHARIA DE PRODU\u00c7\u00c3O<\/b><\/span><\/span><\/span><\/p>\n

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

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Um pedreiro levanta, verticalmente, um <\/b><\/span><\/span><\/span>saco de cimento de massa m = 50kg desde o solo at\u00e9 uma altura h = 3m, com velocidade constante<\/b><\/span><\/span><\/span>, usando um sistema de roldanas, como ilustrado na figura.<\/b><\/span><\/span><\/span><\/p>\n

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Considere que as <\/b><\/span><\/span><\/span>roldanas sejam ideais<\/b><\/span><\/span><\/span> e que tanto a massa das roldanas quanto a massa da corda sejam desprez\u00edveis. A <\/b><\/span><\/span><\/span>acelera\u00e7\u00e3o da gravidade no local \u00e9 g = 10m\/s<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

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

a) a <\/b><\/span><\/span><\/span>intensidade da for\u00e7a F feita pelo pedreiro na corda<\/b><\/span><\/span><\/span>;<\/b><\/span><\/span><\/span><\/p>\n

b) o <\/b><\/span><\/span><\/span>trabalho realizado pelo pedreiro<\/b><\/span><\/span><\/span> nessa tarefa.<\/b><\/span><\/span><\/span><\/p>\n

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

\"\"<\/p>\n

Um mol de um g\u00e1s ideal<\/b><\/span><\/span><\/span> ocupa, <\/b><\/span><\/span><\/span>inicialmente<\/b><\/span><\/span><\/span>, um <\/b><\/span><\/span><\/span>volume V<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> a uma press\u00e3o P<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>. O g\u00e1s <\/b><\/span><\/span><\/span>expande-se<\/b><\/span><\/span><\/span>, mantendo a <\/b><\/span><\/span><\/span>press\u00e3o constante, at\u00e9 ocupar um volume V<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>= 3V<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> . A seguir, a <\/b><\/span><\/span><\/span>press\u00e3o<\/b><\/span><\/span><\/span> do g\u00e1s \u00e9 <\/b><\/span><\/span><\/span>reduzida a um ter\u00e7o da press\u00e3o original, mantendo-se o volume do g\u00e1s fixo igual a V<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> <\/b>. O processo est\u00e1 representado, esquematicamente, no diagrama <\/b><\/span><\/span><\/span>PxV.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em termos de <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> e P<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> , calcule:<\/b><\/span><\/span><\/span><\/p>\n

a) a raz\u00e3o <\/b><\/span><\/span><\/span>T<\/b><\/span><\/span><\/span>i<\/b><\/span><\/span><\/sub><\/span> \/T<\/b><\/span><\/span><\/span>f<\/b><\/span><\/span><\/sub><\/span> entre as temperaturas do g\u00e1s nos estados <\/b><\/span><\/span><\/span>inicial e final;<\/b><\/span><\/span><\/span><\/p>\n

b) o <\/b><\/span><\/span><\/span>trabalho<\/b><\/span><\/span><\/span> realizado pelo g\u00e1s no processo<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Consta de Licenciatura em F\u00edsica as quest\u00f5es 01 e 02 acima (Engenharia de produ\u00e7\u00e3o) e:<\/b><\/span><\/span><\/span><\/p>\n

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

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Dois carros, <\/b><\/span><\/span><\/span>inicialmente emparelhados (t = 0),<\/b><\/span><\/span><\/span> movimentam-se em <\/b><\/span><\/span><\/span>linha reta.<\/b><\/span><\/span><\/span> O gr\u00e1fico ilustra as<\/b><\/span><\/span><\/span><\/p>\n

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velocidades dos dois carros em fun\u00e7\u00e3o do tempo.<\/b><\/span><\/span><\/span><\/p>\n

Com base no gr\u00e1fico:<\/b><\/span><\/span><\/span><\/p>\n

a) determine as <\/b><\/span><\/span><\/span>acelera\u00e7\u00f5es<\/b><\/span><\/span><\/span> dos carros I e II;<\/b><\/span><\/span><\/span><\/p>\n

b) calcule o <\/b><\/span><\/span><\/span>instante <\/b><\/span><\/span><\/span>de tempo em que o <\/b><\/span><\/span><\/span>carro II ultrapassa o carro I<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

 <\/p>\n

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

(CEDERJ-RJ)\u00a0– Centro de Ci\u00eancias e Educa\u00e7\u00e3o Superior a Dist\u00e2ncia do Estado do Rio de Janeiro Objetivo: Contribuir para a interioriza\u00e7\u00e3o do ensino superior p\u00fablico, gratuito e de qualidade no Estado do Rio de Janeiro por meio da oferta de cursos de gradua\u00e7\u00e3o a dist\u00e2ncia, na modalidade semipresencial, garantindo a qualidade destes no que diz respeito ao processo de avalia\u00e7\u00e3o de<\/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-277","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/277","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=277"}],"version-history":[{"count":3,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/277\/revisions"}],"predecessor-version":[{"id":283,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/277\/revisions\/283"}],"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=277"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}