{"id":868,"date":"2015-05-14T19:47:55","date_gmt":"2015-05-14T19:47:55","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=868"},"modified":"2024-09-03T12:55:17","modified_gmt":"2024-09-03T12:55:17","slug":"resolucao-comentada-da-uneal-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-resolvidos-da-uneal-2015\/resolucao-comentada-da-uneal-2015\/","title":{"rendered":"Resolu\u00e7\u00e3o Comentada da UNEAL 2015"},"content":{"rendered":"

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

01- <\/b><\/span><\/span><\/span>A. Falsa<\/b><\/span><\/span><\/span> \"\" existe sim , \u00e9 a <\/b><\/span><\/span><\/span>acelera\u00e7\u00e3o centr\u00edpeta.<\/b><\/span><\/span><\/span><\/p>\n

B. Correta<\/b><\/span><\/span><\/span> \"\" a <\/b><\/span><\/span><\/span>acelera\u00e7\u00e3o vetorial<\/b><\/span><\/span><\/span>\u00a0\"\"\u00a0<\/b><\/span><\/span><\/span>\u00e9 definida como\u00a0\"\", e indica a <\/b><\/span><\/span><\/span>varia\u00e7\u00e3o de velocidade uma unidade de tempo, sendo que essa varia\u00e7\u00e3o pode acontecer tanto em dire\u00e7\u00e3o como em sentido.<\/b><\/span><\/span><\/span><\/p>\n

Assim, a <\/b><\/span><\/span><\/span>acelera\u00e7\u00e3o vetorial<\/b><\/span><\/span><\/span>\u00a0\"\"\u00a0pode ser decomposta em <\/b><\/span><\/span><\/span>duas<\/b><\/span><\/span><\/span>; a <\/b><\/span><\/span><\/span>acelera\u00e7\u00e3o tangencial\u00a0\"\"\u00a0e a acelera\u00e7\u00e3o centr\u00edpeta\u00a0\"\", conforme a figura.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0<\/span><\/p>\n

\"\"\u00a0<\/span>Caracter\u00edsticas da acelera\u00e7\u00e3o tangencial (\"\")<\/b><\/span><\/span><\/span>: \u00e9 <\/b><\/span><\/span><\/span>respons\u00e1vel pela\u00a0<\/b><\/span><\/span><\/span>varia\u00e7\u00e3o da intensidade (m\u00f3dulo)<\/b><\/span><\/span><\/span>\u00a0do vetor velocidade, fazendo com que o movimento seja\u00a0<\/b><\/span><\/span><\/span>acelerado <\/b><\/span><\/span><\/span>ou\u00a0<\/b><\/span><\/span><\/span>retardado<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

C e D. Falsas<\/b><\/span><\/span><\/span> \"\" veja B.\"\"<\/b><\/span><\/span><\/span><\/p>\n

E. Falsa<\/b><\/span><\/span><\/span> \"\" no <\/b><\/span><\/span><\/span>MCU o per\u00edodo<\/b><\/span><\/span><\/span> (tempo que demora para efetuar uma volta completa) \u00e9 o <\/b><\/span><\/span><\/span>mesmo<\/b><\/span><\/span><\/span> e, como a <\/b><\/span><\/span><\/span>freq\u00fc\u00eancia <\/b><\/span><\/span><\/span>(n\u00famero de voltas na unidade de tempo) \u00e9 o <\/b><\/span><\/span><\/span>inverso do per\u00edodo, ela tamb\u00e9m ser\u00e1 a mesma.<\/b><\/span><\/span><\/span><\/p>\n

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

02- <\/b><\/span><\/span><\/span>Para um <\/b><\/span><\/span><\/span>mesmo corpo imerso num l\u00edquido<\/b><\/span><\/span><\/span>, o <\/b><\/span><\/span><\/span>empuxo \u00e9 constante pois, E = d<\/b><\/span><\/span><\/span>l\u00edquido<\/b><\/span><\/span><\/sub><\/span>.g.V<\/b><\/span><\/span><\/span>imerso<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

Observe na <\/b><\/span><\/span><\/span>express\u00e3o acima<\/b><\/span><\/span><\/span> que <\/b><\/span><\/span><\/span>todas as grandezas s\u00e3o constantes<\/b><\/span><\/span><\/span>, portanto o <\/b><\/span><\/span><\/span>empuxo \u00e9 o mesmo independente da profundidade.<\/b><\/span><\/span><\/span><\/p>\n

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

03- <\/b><\/span><\/span><\/span>Descendo o rio \"\" <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/sub><\/span> = V<\/b><\/span><\/span><\/span>b<\/b><\/span><\/span><\/sub><\/span> + V<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span> = 30 (I)<\/b><\/span><\/span><\/span><\/p>\n

Descendo o rio \"\" V<\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/sub><\/span> = V<\/b><\/span><\/span><\/span>b<\/b><\/span><\/span><\/sub><\/span> – V<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span> = 20 (II)<\/b><\/span><\/span><\/span><\/p>\n

(I) + (II)<\/b><\/span><\/span><\/span> \"\" 2V<\/b><\/span><\/span><\/span>b<\/b><\/span><\/span><\/sub><\/span> = 50 \"\" <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>b<\/b><\/span><\/span><\/sub><\/span> = 25 km\/h e V<\/b><\/span><\/span><\/span>c<\/b><\/span><\/span><\/sub><\/span> <\/b>= 30 \u2013 25 <\/b><\/span><\/span><\/span>= 5 km\/h.<\/b><\/span><\/span><\/span><\/p>\n

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

04- <\/b><\/span><\/span><\/span>Para <\/b><\/span><\/span><\/span>qualquer sat\u00e9lite em \u00f3rbita ao redor da Terra<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>for\u00e7a gravitacional \u00e9 igual \u00e0 for\u00e7a resultante centr\u00edpeta <\/b><\/span><\/span><\/span>(desde que a resist\u00eancia do ar seja desprezada).<\/b><\/span><\/span><\/span><\/p>\n

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

05- <\/b><\/span><\/span><\/span>Isotr\u00f3pico<\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>\u00e9 a <\/b><\/span><\/span><\/span>caracteriza\u00e7\u00e3o<\/b><\/span><\/span><\/span> de uma <\/b><\/span><\/span><\/span>subst\u00e2nci<\/b><\/span><\/span><\/span>a que possui as <\/b><\/span><\/span><\/span>mesmas propriedades f\u00edsicas, independentemente da dire\u00e7\u00e3o considerada, <\/b><\/span><\/span><\/span>o que significa que, <\/b><\/span><\/span><\/span>quando aquecida<\/b><\/span><\/span><\/span>, ela se <\/b><\/span><\/span><\/span>dilata igualmente<\/b><\/span><\/span><\/span> em todas as <\/b><\/span><\/span><\/span>dire\u00e7\u00f5es e sentidos, n\u00e3o se deformando<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

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

06- <\/b><\/span><\/span><\/span>Pode-se definir o <\/b><\/span><\/span><\/span>Segundo Princ\u00edpio da Termodin\u00e2mica<\/b><\/span><\/span><\/span> da seguinte maneira: <\/b><\/span><\/span><\/span>\u201c\u00c9 imposs\u00edvel obter uma m\u00e1quina t\u00e9rmica que, operando em ciclos, seja capaz de transformar totalmente o calor por ela recebido em trabalho\u201d<\/b><\/span><\/span><\/span><\/p>\n

A \u00fanica <\/b><\/span><\/span><\/span>falsa \u00e9 a IV<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

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

07- <\/b><\/span><\/span><\/span>Transla\u00e7\u00e3o de um espelho plano<\/b><\/span><\/span><\/span> \u2013\u00a0<\/b><\/span><\/span><\/span>Quando um corpo se <\/b><\/span><\/span><\/span>aproxima ou se afasta de um espelho plano <\/b><\/span><\/span><\/span>com <\/b><\/span><\/span><\/span>velocidade V em rela\u00e7\u00e3o ao espelho<\/b><\/span><\/span><\/span>, sua <\/b><\/span><\/span><\/span>imagem se afasta ou se aproxima do espelho com velocidade V em rela\u00e7\u00e3o ao espelho.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0Assim, como <\/b><\/span><\/span><\/span>objeto e imagem se movem em sentidos contr\u00e1rios, a velocidade do objeto em rela\u00e7\u00e3o \u00e0 imagem ser\u00e1 2V.<\/b><\/span><\/span><\/span><\/p>\n

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

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

\"\"<\/p>\n

III. Correta<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span>Intensidade<\/b><\/span><\/span><\/span> \"\" \u00e9 a <\/b><\/span><\/span><\/span>caracter\u00edstica do som<\/b><\/span><\/span><\/span> que nos permite distinguir um <\/b><\/span><\/span><\/span>som forte<\/b><\/span><\/span><\/span> de um <\/b><\/span><\/span><\/span>som fraco<\/b><\/span><\/span><\/span> e est\u00e1 relacionada com a <\/b><\/span><\/span><\/span>energia transportada pela<\/b><\/span><\/span><\/span> onda que, quanto mais perto da fonte mais forte ser\u00e1 o som e mais afastado da fonte, mais fraco.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

09- <\/b><\/span><\/span><\/span>\u03c1<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> = \u03c1<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>\/3 \"\" <\/b><\/span><\/span><\/span>\u03c1<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> = 3\u03c1<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>; <\/b><\/span><\/span><\/sub><\/span>L<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> = 2L<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> e S<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> = S<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>\/6 \"\" <\/b><\/span><\/span><\/span>S<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> = 6S<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

R<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> = <\/b><\/span><\/span><\/span>\u03c1<\/b><\/span><\/span><\/span>A.<\/b><\/span><\/span><\/sub><\/span>L<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\/S<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> \"\" <\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> = <\/b><\/span><\/span><\/span>\u03c1<\/b><\/span><\/span><\/span>B.<\/b><\/span><\/span><\/sub><\/span>L<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>\/S<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> <\/b>= 3<\/b><\/span><\/span><\/span>\u03c1<\/b><\/span><\/span><\/span>A.<\/b><\/span><\/span><\/sub><\/span>2L<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\/6S<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> <\/b>= \u03c1<\/b><\/span><\/span><\/span>A.<\/b><\/span><\/span><\/sub><\/span>L<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\/S<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> \"\" <\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span> = R<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span> \"\" \"\"e, como <\/b><\/span><\/span><\/span>R e U<\/b><\/span><\/span><\/span> s\u00e3o <\/b><\/span><\/span><\/span>os mesmo<\/b><\/span><\/span><\/span>s, a <\/b><\/span><\/span><\/span>corrente el\u00e9trica i tamb\u00e9m ser\u00e1 a mesma.<\/b><\/span><\/span><\/span><\/p>\n

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

<\/h2>\n

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

RESOLU\u00c7\u00d5ES 01- A. Falsa existe sim , \u00e9 a acelera\u00e7\u00e3o centr\u00edpeta. B. Correta a acelera\u00e7\u00e3o vetorial\u00a0\u00a0\u00e9 definida como\u00a0, e indica a varia\u00e7\u00e3o de velocidade uma unidade de tempo, sendo que essa varia\u00e7\u00e3o pode acontecer tanto em dire\u00e7\u00e3o como em sentido. Assim, a acelera\u00e7\u00e3o vetorial\u00a0\u00a0pode ser decomposta em duas; a acelera\u00e7\u00e3o tangencial\u00a0\u00a0e a acelera\u00e7\u00e3o centr\u00edpeta\u00a0, conforme a figura. \u00a0 \u00a0Caracter\u00edsticas da<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":866,"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-868","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/868","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=868"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/868\/revisions"}],"predecessor-version":[{"id":869,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/868\/revisions\/869"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/866"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=868"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}