{"id":3554,"date":"2018-01-19T12:33:04","date_gmt":"2018-01-19T12:33:04","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=3554"},"modified":"2024-09-04T12:37:10","modified_gmt":"2024-09-04T12:37:10","slug":"resolucao-comentada-das-questoes-de-fisica-do-vestibular-da-puc-sp-2018","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2018\/puc-sp-2018\/resolucao-comentada-das-questoes-de-fisica-do-vestibular-da-puc-sp-2018\/","title":{"rendered":"Resolu\u00e7\u00e3o comentada das quest\u00f5es de F\u00cdSICA do vestibular da PUC \u2013 SP \u2013 2018."},"content":{"rendered":"

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

PUC \u2013 SP \u2013 2018.<\/span><\/span><\/span><\/p>\n

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

Como tem <\/b><\/span><\/span><\/span>curto circuito vamos refazer<\/b><\/span><\/span><\/span> a associa\u00e7\u00e3o <\/b><\/span><\/span><\/span>marcando todos os n\u00f3s que possuem o mesmo potencial com a mesma letra (A)<\/b><\/span><\/span><\/span> e os <\/b><\/span><\/span><\/span>outros, C e D<\/b><\/span><\/span><\/span> e, em seguida vamos <\/b><\/span><\/span><\/span>calcular a resist\u00eancia do resistor equivalente conforme a sequ\u00eancia a seguir: <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Entre os pontos A e B <\/b><\/span><\/span><\/span>a corrente circula <\/b><\/span><\/span><\/span>apenas pelo ultimo resistor de 12 \u2126 \"\" R<\/b><\/span><\/span><\/span>eq<\/b><\/span><\/span><\/sub><\/span> = 12 \"\"<\/b><\/span><\/span><\/span> <\/b><\/p>\n

Ou ainda, veja na <\/b><\/span><\/span><\/span>figura que se a corrente el\u00e9trica i entrar pelo ponto A ela se desviar\u00e1 conforme <\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

I<\/b><\/span><\/span><\/span>ndicado<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span><\/span>circular\u00e1 apenas pelo \u00faltimo resistor \"\"<\/b><\/span><\/span><\/span> R<\/b><\/span><\/span><\/span>eq<\/b><\/span><\/span><\/sub><\/span> = 12 \"\"<\/b><\/span><\/span><\/span><\/p>\n

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

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

Um <\/b><\/span><\/span>eclipse solar <\/b><\/span><\/span>ocorre quando a <\/b><\/span><\/span>lua est\u00e1 alinhada entre a terra e o sol <\/b><\/span><\/span>o que s\u00f3 ocorre na <\/b><\/span><\/span>fase de Lua Nova.<\/b><\/span><\/span><\/p>\n

Eclipse solar<\/b><\/span><\/span><\/span><\/span><\/p>\n

Analise com aten\u00e7\u00e3o todos os detalhes da figura abaixo:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Fases da Lua<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

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

Se voc\u00ea n\u00e3o domina a teoria, leia a explica\u00e7\u00e3o a seguir:<\/b><\/span><\/span><\/span><\/p>\n

Considere um\u00a0<\/b><\/span><\/span><\/span>bloco de massa m<\/b><\/span><\/span><\/span>\u00a0sobre um plano horizontal, sujeito a uma <\/b><\/span><\/span><\/span>for\u00e7a externa\u00a0F de intensidade vari\u00e1vel.<\/b><\/span><\/span><\/span><\/p>\n

Quando o\u00a0<\/b><\/span><\/span><\/span>corpo estiver em repouso e n\u00e3o houver for\u00e7a externa, F<\/b><\/span><\/span><\/span>at<\/b><\/span><\/span><\/sub><\/span>\u00a0= 0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Com o corpo<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span>permanecendo em repouso,<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span>aumentando a intensidade da for\u00e7a externa\u00a0\"\"<\/b><\/span><\/span><\/span>, a\u00a0<\/b><\/span><\/span><\/span>intensidade da for\u00e7a de atrito est\u00e1tico\u00a0\"\"\u00a0tamb\u00e9m aumenta<\/b><\/span><\/span><\/span>\u00a0(figuras acima),\u00a0<\/b><\/span><\/span><\/span>at\u00e9 que o corpo fique na<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span>imin\u00eancia de movimento\u00a0<\/b><\/span><\/span><\/span>(figura abaixo<\/b><\/span><\/span><\/span>).<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Na\u00a0<\/b><\/span><\/span><\/span>express\u00e3o acima,\u00a0<\/b><\/span><\/span><\/span>\u03bc<\/b><\/span><\/span><\/span>e<\/b><\/span><\/span><\/sub><\/span>\u00a0\u00e9 coeficiente de atrito est\u00e1tico<\/b><\/span><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span><\/span>N a intensidade da for\u00e7a normal<\/b><\/span><\/span><\/span>, que o bloco troca com o plano.<\/b><\/span><\/span><\/span><\/p>\n

Qualquer valor de\u00a0<\/b><\/span><\/span><\/span>for\u00e7a externa<\/b><\/span><\/span><\/span>\u00a0aplicada com\u00a0<\/b><\/span><\/span><\/span>intensidade maior ou igual a\u00a0F<\/b><\/span><\/span><\/span>3<\/b><\/span><\/span><\/sub><\/span>\u00a0faz com que o corpo\u00a0<\/b><\/span><\/span><\/span>entre em movimento e, a partir da\u00ed a for\u00e7a de atrito \u00e9 din\u00e2mica ou cin\u00e9tica.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Essa\u00a0<\/b><\/span><\/span><\/span>for\u00e7a de atrito din\u00e2mico ou cin\u00e9tico<\/b><\/span><\/span><\/span>\u00a0que surge\u00a0<\/b><\/span><\/span><\/span>depois que o bloco entrou em movimento<\/b><\/span><\/span><\/span><\/p>\n

\u00e9 sempre a mesma, independente da velocidade e da for\u00e7a externa\u00a0<\/b><\/span><\/span><\/span>e sua intensidade \u00e9 fornecida pela express\u00e3o:\u00a0<\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/span>atd<\/b><\/span><\/span><\/sub><\/span>\u00a0= \u03bc<\/b><\/span><\/span><\/span>d<\/b><\/span><\/span><\/sub><\/span>.N<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

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

Transforma\u00e7\u00e3o isoc\u00f3rica, isom\u00e9trica ou isovolum\u00e9trica<\/b><\/span><\/span><\/span><\/p>\n

\u00a0Nessa\u00a0<\/b><\/span><\/span><\/span>transforma\u00e7\u00e3o o volume \u00e9 mantido constante<\/b><\/span><\/span><\/span>\u00a0(isso=igual; coros=volume).<\/b><\/span><\/span><\/span><\/p>\n

Os f\u00edsicos\u00a0<\/b><\/span><\/span><\/span>Jacques Charles e Gay-Lussac descobriram experimentalmente que<\/b><\/span><\/span><\/span>,\u00a0numa\u00a0<\/b><\/span><\/span><\/span>transforma\u00e7\u00e3o isoc\u00f3rica, a press\u00e3o (P) \u00e9 diretamente proporcional \u00e0 temperatura absoluta (T),\u00a0<\/b><\/span><\/span><\/span>ou seja:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span><\/span>express\u00e3o acima<\/b><\/span><\/span><\/span>\u00a0s\u00f3 \u00e9 v\u00e1lida se considerarmos a\u00a0<\/b><\/span><\/span><\/span>temperatura absoluta, <\/b><\/span><\/span><\/span>isto \u00e9, na\u00a0<\/b><\/span><\/span><\/span>escala kelvin.<\/b><\/span><\/span><\/span><\/p>\n

Se a\u00a0<\/b><\/span><\/span><\/span>temperatura for medida em graus Celsius, isso n\u00e3o se aplica.<\/b><\/span><\/span><\/span><\/p>\n

Na express\u00e3o\u00a0<\/b><\/span><\/span><\/span>P<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> \/T<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\u00a0= P\/T, conhecida como\u00a0lei de Charles,\u00a0P<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\u00a0e T<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\u00a0representam a press\u00e3o e a<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>temperatura absoluta do g\u00e1s no estado inicial:<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>P e T representam, respectivamente, a press\u00e3o e a temperatura absoluta do g\u00e1s no estado final.<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Pode-se\u00a0<\/b><\/span><\/span><\/span>transformar uma indica\u00e7\u00e3o de uma escala para outra\u00a0<\/b><\/span><\/span><\/span>conforme o procedimento a seguir,<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

de acordo com a\u00a0<\/b><\/span><\/span><\/span>rela\u00e7\u00e3o matem\u00e1tica baseada no teorema de Thales.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

06-<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

07-<\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

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

\"\"<\/p>\n

\"\"<\/p>\n

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

Voltar para os exerc\u00edcios<\/span><\/a><\/h3>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Resolu\u00e7\u00e3o comentada das quest\u00f5es de F\u00cdSICA do vestibular da PUC \u2013 SP \u2013 2018. 01- Como tem curto circuito vamos refazer a associa\u00e7\u00e3o marcando todos os n\u00f3s que possuem o mesmo potencial com a mesma letra (A) e os outros, C e D e, em seguida vamos calcular a resist\u00eancia do resistor equivalente conforme a sequ\u00eancia a seguir: Entre os<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3552,"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-3554","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3554","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=3554"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3554\/revisions"}],"predecessor-version":[{"id":3555,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3554\/revisions\/3555"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3552"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=3554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}