{"id":3070,"date":"2017-06-04T17:53:12","date_gmt":"2017-06-04T17:53:12","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=3070"},"modified":"2024-09-03T17:36:35","modified_gmt":"2024-09-03T17:36:35","slug":"resolucao-comentada-das-questoes-de-fisica-do-vestibular-da-uniceub-df-2017","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2017\/uniceub-medicina-2017\/resolucao-comentada-das-questoes-de-fisica-do-vestibular-da-uniceub-df-2017\/","title":{"rendered":"Resolu\u00e7\u00e3o comentada das quest\u00f5es de F\u00cdSICA do vestibular da UNICEUB-DF-2017"},"content":{"rendered":"

Resolu\u00e7\u00e3o comentada das quest\u00f5es de F\u00cdSICA do vestibular da <\/b><\/span><\/span><\/span><\/p>\n

UNICEUB-DF-2017<\/b><\/span><\/span><\/span><\/p>\n

01- <\/b><\/span><\/span><\/span><\/p>\n

85-<\/b><\/span><\/span><\/span> Correta \"\" <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>hipermetropia \u00e9 corrigida por lentes convergentes, <\/b><\/span><\/span><\/span>pois, nela a <\/b><\/span><\/span><\/span>imagem fica localizada atr\u00e1s da retina <\/b><\/span><\/span><\/span>e as <\/b><\/span><\/span><\/span>lentes convergentes aproximam essas imagens colocando-as sobre a retina. <\/b><\/span><\/span><\/span><\/p>\n

86- <\/b><\/span><\/span><\/span>Errada \"\"<\/b><\/span><\/span><\/span> se o <\/b><\/span><\/span><\/span>foco estiver sobre a retina <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>imagem ser\u00e1 impr\u00f3pria.<\/b><\/span><\/span><\/span><\/p>\n

02-<\/b><\/span><\/span><\/span><\/p>\n

87<\/b><\/span><\/span><\/span> <\/b>–<\/b><\/span><\/span><\/span> <\/b>Errada \"\"<\/b><\/span><\/span><\/span> <\/b>m <\/b><\/span><\/span><\/span>= 60%de 70 kg = 0,6×70 <\/b><\/span><\/span><\/span>= 42 kg de \u00e1gua \"\"<\/b><\/span><\/span><\/span> <\/b>c = 1 cal\/g<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>C \"\" \"\"<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> = 36,5 <\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>C <\/b><\/span><\/span><\/span>e \"\"<\/b><\/span><\/span><\/span> =<\/b><\/span><\/span><\/span> <\/b>40 <\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>C. <\/b><\/span><\/span><\/span><\/p>\n

Equa\u00e7\u00e3o fundamental da ondulat\u00f3ria \"\"<\/b><\/span><\/span><\/span> <\/b>Q = m.c.(\"\" – \"\"<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>) <\/b><\/span><\/span><\/span>= 42.1.3,5 <\/b><\/span><\/span><\/span>= 147 kcal <\/b><\/span><\/span><\/span>< 150 k cal.<\/b><\/span><\/span><\/span><\/p>\n

88<\/b><\/span><\/span><\/span> \"\" Correta \"\" ao se evaporar a \u00e1gua retira calor do corpo diminuindo <\/b><\/span><\/span><\/span>sua temperatura.<\/b><\/span><\/span><\/span><\/p>\n

89<\/b><\/span><\/span><\/span> \"\"<\/b><\/span><\/span><\/span> Correta \"\" como a escala Celsius possui 100 unidades e a Fahrenheit 180 unidades, quando a Celsius variar de 5 unidades, a Fahrenheit varia r\u00e1 de 9 <\/b><\/span><\/span><\/span>unidades.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

03-<\/b><\/span><\/span><\/span><\/p>\n

90<\/b><\/span><\/span><\/span> \"\" Errada<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

observe na <\/b><\/span><\/span><\/span>express\u00e3o C = \"\"<\/b><\/span><\/span><\/span> <\/b>que,<\/b><\/span><\/span><\/span> sendo a <\/b><\/span><\/span><\/span>capacit\u00e2ncia C constante <\/b><\/span><\/span><\/span>se a <\/b><\/span><\/span><\/span>carga Q for dobrada a tens\u00e3o U tamb\u00e9m ser\u00e1 dobrada.<\/b><\/span><\/span><\/span><\/p>\n

Por outro lado, pela <\/b><\/span><\/span><\/span>express\u00e3o da energia (el\u00e9trica) W = \"\", <\/b><\/span><\/span><\/span>sendo a <\/b><\/span><\/span><\/span>capacit\u00e2ncia constante, <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>energia \u00e9 diretamente proporcional \u00e0 tens\u00e3o U ao quadrado (U<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>).<\/b><\/span><\/span><\/span> Assim, a <\/b><\/span><\/span><\/span>energia fica 2<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span> = 4 vezes maior.<\/b><\/span><\/span><\/span><\/p>\n

91 \"\"<\/b><\/span><\/span><\/span> Correta \"\" C = \"\" \"\" <\/b><\/span><\/span><\/span>70.10<\/b><\/span><\/span><\/span>-6<\/b><\/span><\/span><\/sup><\/span> = \"\" <\/b><\/span><\/span><\/span> \"\" U = \"\"<\/b><\/span><\/span><\/span> = 10<\/b><\/span><\/span><\/span>5<\/b><\/span><\/span><\/sup><\/span> <\/b>= 100.000 V.<\/b><\/span><\/span><\/span><\/p>\n

92 \"\"<\/b><\/span><\/span><\/span> Correta \"\" <\/b><\/span><\/span><\/span>W = 70.10<\/b><\/span><\/span><\/span>-6<\/b><\/span><\/span><\/sup><\/span>.(10<\/b><\/span><\/span><\/span>5<\/b><\/span><\/span><\/sup><\/span>)<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\/2 <\/b><\/span><\/span><\/span>= 70.10<\/b><\/span><\/span><\/span>-6<\/b><\/span><\/span><\/sup><\/span>.10<\/b><\/span><\/span><\/span>10<\/b><\/span><\/span><\/sup><\/span>\/2 = 35.10<\/b><\/span><\/span><\/span>4<\/b><\/span><\/span><\/sup><\/span> = 350.10<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sup><\/span> <\/b>= 350 kJ.<\/b><\/span><\/span><\/span><\/p>\n

04-<\/b><\/span><\/span><\/span><\/p>\n

93 \"\" Errada \"\"<\/b><\/span><\/span><\/span><\/p>\n

Resson\u00e2ncia<\/b><\/span><\/span><\/span><\/p>\n

Qualquer sistema f\u00edsico possui uma ou mais frequ\u00eancias naturais de vibra\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

Quando ele \u00e9\u00a0<\/b><\/span><\/span><\/span>\u201cexcitado\u201d por algum agente externo, agindo<\/b><\/span><\/span><\/span>\u00a0no\u00a0<\/b><\/span><\/span><\/span>ritmo de uma dessas frequ\u00eancias,\u00a0<\/b><\/span><\/span><\/span>surge o\u00a0<\/b><\/span><\/span><\/span>fen\u00f4meno da resson\u00e2ncia,\u00a0<\/b><\/span><\/span><\/span>ou seja, ele <\/b><\/span><\/span><\/span>come\u00e7a a oscilar gradativamente at\u00e9 atingir uma dessas frequ\u00eancias, onde sua amplitude \u00e9 m\u00e1xima.<\/b><\/span><\/span><\/span><\/p>\n

ara que um<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>corpo vibre em resson\u00e2ncia com outro<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>\u00e9 preciso que ele <\/b><\/span><\/span><\/span>tenha uma <\/b><\/span><\/span><\/span>frequ\u00eancia natural pr\u00f3xima da frequ\u00eancia natural do outro.<\/b><\/span><\/span><\/span><\/p>\n

94<\/b><\/span><\/span><\/span> \"\" Correta \"\"<\/b><\/span><\/span><\/span> <\/b>Equa\u00e7\u00e3o fundamental da ondulat\u00f3ria \"\" V = <\/b><\/span><\/span><\/span>\u0001<\/b><\/span><\/span><\/span>.f \"\"<\/b><\/span><\/span><\/span> 1500 = <\/b><\/span><\/span><\/span>\u0001<\/b><\/span><\/span><\/span>.6.10<\/b><\/span><\/span><\/span>6<\/b><\/span><\/span><\/sup><\/span> \"\" <\/b><\/span><\/span><\/span>\u0001 <\/b><\/span><\/span><\/span>=<\/b><\/span><\/span><\/span> \"\"<\/b><\/span><\/span><\/span> <\/b>= 2,5.10<\/b><\/span><\/span><\/span>-4<\/b><\/span><\/span><\/sup><\/span>m = 0,25.10<\/b><\/span><\/span><\/span>-3<\/b><\/span><\/span><\/sup><\/span> m <\/b><\/span><\/span><\/span>= \"\" mm.<\/b><\/span><\/span><\/span><\/p>\n

95<\/b><\/span><\/span><\/span> \"\" Errada \"\"<\/b><\/span><\/span><\/span> <\/b>V = 1500 m\/s \"\"<\/b><\/span><\/span><\/span> <\/b>\u2206S<\/b><\/span><\/span><\/span> = 15 + 15 = 30 cm <\/b><\/span><\/span><\/span>= 0,3 m \"\"<\/b><\/span><\/span><\/span> <\/b>V = \"\"<\/b><\/span><\/span><\/span> \"\" 1500 = \"\" \"\" <\/b><\/span><\/span><\/span>\u2206t =<\/b><\/span><\/span><\/span> \"\"<\/b><\/span><\/span><\/span> = 0,0002 s <\/b><\/span><\/span><\/span>= 0,2ms.<\/b><\/span><\/span><\/span><\/p>\n

96<\/b><\/span><\/span><\/span> \"\" Errada \"\" <\/b><\/span><\/span><\/span>Baseia-se<\/b><\/span><\/span><\/span> <\/b>nos<\/b><\/span><\/span><\/span> fen\u00f4menos <\/b><\/span><\/span><\/span>da<\/b><\/span><\/span><\/span> propaga\u00e7\u00e3o <\/b><\/span><\/span><\/span>e da <\/b><\/span><\/span><\/span>reflex\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

 <\/p>\n

Voltar para os exerc\u00edcios<\/span><\/a><\/h3>\n","protected":false},"excerpt":{"rendered":"

Resolu\u00e7\u00e3o comentada das quest\u00f5es de F\u00cdSICA do vestibular da UNICEUB-DF-2017 01- 85- Correta a hipermetropia \u00e9 corrigida por lentes convergentes, pois, nela a imagem fica localizada atr\u00e1s da retina e as lentes convergentes aproximam essas imagens colocando-as sobre a retina. 86- Errada se o foco estiver sobre a retina a imagem ser\u00e1 impr\u00f3pria. 02- 87 – Errada m = 60%de<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3068,"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-3070","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3070","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=3070"}],"version-history":[{"count":2,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3070\/revisions"}],"predecessor-version":[{"id":3072,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3070\/revisions\/3072"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3068"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=3070"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}