{"id":840,"date":"2015-05-14T18:00:02","date_gmt":"2015-05-14T18:00:02","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=840"},"modified":"2024-09-03T13:12:17","modified_gmt":"2024-09-03T13:12:17","slug":"resolucao-comentada-da-unisc-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-resolvidos-da-unisc-2015\/resolucao-comentada-da-unisc-2015\/","title":{"rendered":"Resolu\u00e7\u00e3o Comentada da UNISC 2015"},"content":{"rendered":"

RESOLU\u00c7\u00d5ES<\/span><\/span><\/span><\/p>\n

01- <\/span><\/span><\/span>Define-se a <\/b><\/span><\/span><\/span>intensidade de corrente el\u00e9trica<\/b><\/span><\/span><\/span> como sendo a grandeza escalar <\/b><\/span><\/span><\/span>i=Q\/\u0394t<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span> Esta express\u00e3o fornece a intensidade m\u00e9dia de corrente el\u00e9trica, mas tamb\u00e9m pode medir corrente el\u00e9trica constante.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>unidade de corrente el\u00e9trica no SI \u00e9 o amp\u00e8re<\/b><\/span><\/span><\/span> ( em homenagem ao f\u00edsico e matem\u00e1tico franc\u00eas Andr\u00e9 Marie Amp\u00e8re \u201c1775-1836\u201d), <\/b><\/span><\/span><\/span>de s\u00edmbolo\u00a0<\/b><\/span><\/span><\/span>A.<\/b><\/span><\/span><\/span><\/p>\n

I=Q\/\u0394t<\/b><\/span><\/span><\/span>\u00a0\"\" <\/b><\/span><\/span><\/span>1 amp\u00e8re=1 coulomb\/1 segundo<\/b><\/span><\/span><\/span>\u00a0\"\"\u00a0<\/b><\/span><\/span><\/span>1A=1C\/1s\u00a0 \"\" 1C = 1 A.1s \"\" <\/b><\/span><\/span><\/span>C = A.s.<\/b><\/span><\/span><\/span><\/p>\n

R- B<\/b><\/span><\/span><\/span><\/p>\n

02- <\/span><\/span><\/span>Se o corpo se move com <\/b><\/span><\/span><\/span>velocidade constante em um plano horizontal<\/b><\/span><\/span><\/span>, ele est\u00e1 em <\/b><\/span><\/span><\/span>MRU<\/b><\/span><\/span><\/span> (equil\u00edbrio din\u00e2mico) e a <\/b><\/span><\/span><\/span>for\u00e7a resultante<\/b><\/span><\/span><\/span> sobre ele \u00e9 <\/b><\/span><\/span><\/span>nula \"\"<\/b><\/span><\/span><\/span> nessas condi\u00e7\u00f5es a <\/b><\/span><\/span><\/span>for\u00e7a F<\/b><\/span><\/span><\/span> que o est\u00e1 deslocando tem o <\/b><\/span><\/span><\/span>mesmo m\u00f3dulo que o da for\u00e7a de atrito F<\/b><\/span><\/span><\/span>at<\/b><\/span><\/span><\/sub><\/span> <\/b> \"\" <\/b><\/span><\/span><\/span>F = F<\/b><\/span><\/span><\/span>at<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

Ent\u00e3o <\/b><\/span><\/span><\/span>W<\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/sub><\/span> = W<\/b><\/span><\/span><\/span>fat<\/b><\/span><\/span><\/sub><\/span> = 2000 J (em m\u00f3dulo).<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

W<\/b><\/span><\/span><\/span><\/span>F<\/b><\/span><\/span><\/span><\/sub><\/span> = W<\/b><\/span><\/span><\/span><\/span>Fat<\/b><\/span><\/span><\/span><\/sub><\/span> = F.d.cos<\/b><\/span><\/span><\/span><\/span>\u03b1<\/b><\/span><\/span><\/span> \"\" 2000 = F.20.cos0<\/b><\/span><\/span><\/span><\/span>o<\/b><\/span><\/span><\/span><\/sup><\/span> \"\" 2000 = F,20.1 \"\" F = F<\/b><\/span><\/span><\/span><\/span>at<\/b><\/span><\/span><\/span><\/sub><\/span> = 2000\/20 \"\" <\/b><\/span><\/span><\/span><\/span>F<\/b><\/span><\/span><\/span><\/span>at<\/b><\/span><\/span><\/span><\/sub><\/span> = 100N<\/b><\/span><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span><\/span>\u03bcP<\/b><\/span><\/span><\/span><\/span> = 100 \"\" <\/b><\/span><\/span><\/span><\/span>\u03bc<\/b><\/span><\/span><\/span>mg <\/b><\/span><\/span><\/span><\/span>=100 \"\" 0,5.m.10 = 100 \"\" m = 100\/5 \"\" <\/b><\/span><\/span><\/span><\/span>m= 20 kg.<\/b><\/span><\/span><\/span><\/span><\/p>\n

R- C<\/b><\/span><\/span><\/span><\/p>\n

03- <\/span><\/span><\/span>Observe na express\u00e3o <\/b><\/span><\/span><\/span>P = R.i<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span> que, sendo <\/b><\/span><\/span><\/span>R constante<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>a pot\u00eancia P<\/b><\/span><\/span><\/span> \u00e9 <\/b><\/span><\/span><\/span>diretamente proporcional<\/b><\/span><\/span><\/span> ao <\/b><\/span><\/span><\/span>quadrado da corrente el\u00e9trica i<\/b><\/span><\/span><\/span> \"\" se <\/b><\/span><\/span><\/span>i dobrar<\/b><\/span><\/span><\/span> para 2i, a <\/b><\/span><\/span><\/span>nova pot\u00eancia ficar\u00e1 2<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span> = 4 vezes maior.<\/b><\/span><\/span><\/span><\/p>\n

R- D<\/b><\/span><\/span><\/span><\/p>\n

04- <\/span><\/span><\/span>Lei de Snell-Descartes<\/b><\/span><\/span><\/span> – A rela\u00e7\u00e3o entre o <\/b><\/span><\/span><\/span>seno do \u00e2ngulo de incid\u00eancia e o seno do \u00e2ngulo de<\/b><\/span><\/span><\/span> <\/b><\/p>\n

\"\"<\/p>\n

refra\u00e7\u00e3o<\/b><\/span><\/span><\/span> \u00e9 uma grandeza constante denominada <\/b><\/span><\/span><\/span>\u00edndice de refra\u00e7\u00e3o<\/b><\/span><\/span><\/span> do segundo meio em rela\u00e7\u00e3o ao primeiro, ou seja,\u00a0 <\/b><\/span><\/span><\/span>seni\/senr=n<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>\/n<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span>\u00a0\u00a0<\/b><\/span><\/span><\/sub><\/span><\/p>\n

R- A<\/b><\/span><\/span><\/span><\/p>\n

05- \"\"<\/span><\/span><\/span><\/p>\n

06- <\/span><\/span><\/span>Corpo 1<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>2<\/b><\/span><\/span><\/sup><\/span> = V<\/b><\/span><\/span><\/span>o1<\/b><\/span><\/span><\/sub><\/span>2<\/b><\/span><\/span><\/sup><\/span> + 2.g.h<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

Corpo 2<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>2<\/b><\/span><\/span><\/sup><\/span> = V<\/b><\/span><\/span><\/span>o2<\/b><\/span><\/span><\/sub><\/span>2<\/b><\/span><\/span><\/sup><\/span> + 2.g.h<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

V<\/b><\/span><\/span><\/span>o1<\/b><\/span><\/span><\/sub><\/span> = V<\/b><\/span><\/span><\/span>o2<\/b><\/span><\/span><\/sub><\/span> = 0 e V<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> = 2V<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> \"\" <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>2<\/b><\/span><\/span><\/sup><\/span> = 2.g.h<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span> (I) \"\" <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span>2<\/b><\/span><\/span><\/sup><\/span> = 2.g.h<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> \"\" <\/b><\/span><\/span><\/span>(2V<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>)<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span> = 2.g.h<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> \"\" 4V<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>2<\/b><\/span><\/span><\/sup><\/span> = 2.g.h<\/b><\/span><\/span><\/span>2 <\/b><\/span><\/span><\/sub><\/span> (II).<\/b><\/span><\/span><\/span><\/p>\n

(I)\/(II) \"\" V<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>2<\/b><\/span><\/span><\/sup><\/span>\/4V<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>2<\/b><\/span><\/span><\/sup><\/span> = 2gh<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>\/2gh<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> \"\" <\/b><\/span><\/span><\/span>1\/4 = h<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>\/h<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> \"\" h<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sub><\/span> = 4h<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

R- E<\/b><\/span><\/span><\/span><\/p>\n

<\/h2>\n

Voltar para os exerc\u00edcios.<\/span><\/a><\/h2>\n","protected":false},"excerpt":{"rendered":"

RESOLU\u00c7\u00d5ES 01- Define-se a intensidade de corrente el\u00e9trica como sendo a grandeza escalar i=Q\/\u0394t. Esta express\u00e3o fornece a intensidade m\u00e9dia de corrente el\u00e9trica, mas tamb\u00e9m pode medir corrente el\u00e9trica constante. A unidade de corrente el\u00e9trica no SI \u00e9 o amp\u00e8re ( em homenagem ao f\u00edsico e matem\u00e1tico franc\u00eas Andr\u00e9 Marie Amp\u00e8re \u201c1775-1836\u201d), de s\u00edmbolo\u00a0A. I=Q\/\u0394t\u00a0 1 amp\u00e8re=1 coulomb\/1 segundo\u00a0\u00a01A=1C\/1s\u00a0 1C<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":838,"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-840","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/840","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=840"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/840\/revisions"}],"predecessor-version":[{"id":841,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/840\/revisions\/841"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/838"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}