{"id":607,"date":"2015-04-12T13:40:38","date_gmt":"2015-04-12T13:40:38","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=607"},"modified":"2024-09-02T16:50:35","modified_gmt":"2024-09-02T16:50:35","slug":"confira-a-resolucao-comentada-da-ifsc-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/universidades-2015\/exercicios-da-ifsc-2015\/confira-a-resolucao-comentada-da-ifsc-2015\/","title":{"rendered":"Confira a resolu\u00e7\u00e3o comentada da IFSC 2015"},"content":{"rendered":"

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

01- <\/span><\/span><\/span>01.<\/b><\/span><\/span><\/span> <\/b>O <\/b><\/span><\/span>efeito fotoel\u00e9trico<\/b><\/span><\/span><\/span> s\u00f3 ocorre a partir de uma <\/b><\/span><\/span>frequ\u00eancia de corte<\/b><\/span><\/span><\/span>, denominada <\/b><\/span><\/span>fun\u00e7\u00e3o trabalho.<\/b><\/span><\/span><\/span><\/p>\n

01- Correta<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span>A figura abaixo mostra o <\/b><\/span><\/span><\/span>gr\u00e1fico da energia cin\u00e9tica<\/b><\/span><\/span><\/span> do el\u00e9tron extra\u00eddo em fun\u00e7\u00e3o da <\/b><\/span><\/span><\/span>frequ\u00eancia<\/b><\/span><\/span><\/span> da radia\u00e7\u00e3o (f\u00f3ton, cor) incidente, para uma mesma placa met\u00e1lica <\/b><\/span><\/span><\/span>(c\u00e9lula fotoel\u00e9trica).<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Observe que <\/b><\/span><\/span><\/span>f<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\u00a0\u00e9 a freq\u00fc\u00eancia m\u00ednima (frequ\u00eancia de corte, denominada fun\u00e7\u00e3o trabalho) necess\u00e1ria para produzir o efeito fotoel\u00e9trico.\u00a0<\/b><\/span><\/span><\/span><\/p>\n

02.<\/b><\/span><\/span><\/span> <\/b>Qualquer que seja a <\/b><\/span><\/span>frequ\u00eancia<\/b><\/span><\/span><\/span> e comprimento de onda da luz incidente \u00e9 <\/b><\/span><\/span>poss\u00edvel que sejam arrancados el\u00e9trons do metal.<\/b><\/span><\/span><\/span><\/p>\n

02. Falsa \"\" veja 01.<\/b><\/span><\/span><\/span><\/p>\n

04.<\/b><\/span><\/span><\/span> <\/b>Quaisquer que sejam a <\/b><\/span><\/span>frequ\u00eancia, comprimento de onda e a intensidade da luz,<\/b><\/span><\/span><\/span> os <\/b><\/span><\/span>el\u00e9trons s\u00e3o emitidos com a mesma energia cin\u00e9tica.<\/b><\/span><\/span><\/span><\/p>\n

04. Correta \"\" <\/b><\/span><\/span>Quaisquer que sejam a <\/b><\/span><\/span>frequ\u00eancia<\/b><\/span><\/span><\/span> desde que seja <\/b><\/span><\/span><\/span>mesma freq\u00fc\u00eancia f<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>energia cin\u00e9tica<\/b><\/span><\/span><\/span> dos el\u00e9trons emitidos \u00e9 <\/b><\/span><\/span><\/span>sempre a mesma<\/b><\/span><\/span><\/span>, pois, E<\/b><\/span><\/span><\/span>c<\/b><\/span><\/span><\/sub><\/span>\u00a0= hf \u2013 W=h.f \u2013 h.f<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>\u00a0= constante.<\/b><\/span><\/span><\/span><\/p>\n

08.<\/b><\/span><\/span><\/span> <\/b>Quanto <\/b><\/span><\/span>maior a frequ\u00eancia da luz<\/b><\/span><\/span><\/span> de uma determinada intensidade <\/b><\/span><\/span>incidindo sobre o metal, mais el\u00e9trons abandonam o metal.<\/b><\/span><\/span><\/span><\/p>\n

08- Correta<\/b><\/span><\/span><\/span> \"\" o <\/b><\/span><\/span>n\u00famero de el\u00e9trons arrancados<\/b><\/span><\/span><\/span> \u00e9 <\/b><\/span><\/span>diretamente proporcional \u00e0 intensidade da<\/b><\/span><\/span><\/span> <\/b>radia\u00e7\u00e3o eletromagn\u00e9tica incidente<\/b><\/span><\/span><\/span>, ou seja, <\/b><\/span><\/span>aumentando a intensidade da radia\u00e7\u00e3o (freq\u00fc\u00eancia, cor)<\/b><\/span><\/span><\/span> incidente no metal, <\/b><\/span><\/span>aumenta-se<\/b><\/span><\/span><\/span> o n\u00edvel energ\u00e9tico dos f\u00f3tons incidentes, <\/b><\/span><\/span>aumentando assim n\u00famero de el\u00e9trons.\u00a0<\/b><\/span><\/span><\/span><\/p>\n

16.<\/b><\/span><\/span><\/span> <\/b>Quanto <\/b><\/span><\/span>maior a frequ\u00eancia<\/b><\/span><\/span><\/span> da luz de uma determinada intensidade incidindo sobre o metal,<\/b><\/span><\/span><\/p>\n

maiores s\u00e3o as energias<\/b><\/span><\/span><\/span> com que os el\u00e9trons abandonam o metal.<\/b><\/span><\/span><\/p>\n

16. Falsa<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span>Veja 04.<\/b><\/span><\/span><\/span><\/p>\n

Soma (01 + 04 + 08) = 13<\/b><\/span><\/span><\/span><\/p>\n

02- <\/span><\/span><\/span>01<\/b><\/span><\/span><\/span>. <\/b><\/span><\/span>Nesse brinquedo a <\/b><\/span><\/span>for\u00e7a normal e a for\u00e7a peso constituem um par a\u00e7\u00e3o e rea\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

01. Falsa<\/b><\/span><\/span><\/span> \"\" A <\/b><\/span><\/span>rea\u00e7\u00e3o <\/b><\/span><\/span><\/span>da <\/b><\/span><\/span>for\u00e7a peso<\/b><\/span><\/span><\/span> est\u00e1 no <\/b><\/span><\/span>centro da Terra<\/b><\/span><\/span><\/span> e a rea\u00e7\u00e3o da <\/b><\/span><\/span>for\u00e7a normal<\/b><\/span><\/span><\/span> est\u00e1 na<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

superf\u00edcie do cilindro (for\u00e7a que a parede do cilindro troca com a moto).<\/b><\/span><\/span><\/span><\/p>\n

02.<\/b><\/span><\/span><\/span> <\/b>Nesse brinquedo a <\/b><\/span><\/span>for\u00e7a de atrito e a for\u00e7a peso n\u00e3o constituem um par a\u00e7\u00e3o e rea\u00e7\u00e3o<\/b><\/span><\/span><\/span>, por\u00e9m \u00e9 <\/b><\/span><\/span>essa for\u00e7a que equilibra a for\u00e7a peso evitando que o motociclista caia.<\/b><\/span><\/span><\/span><\/p>\n

02. Correta<\/b><\/span><\/span><\/span> \"\" a <\/b><\/span><\/span>for\u00e7a de atrito<\/b><\/span><\/span><\/span> \u00e9 <\/b><\/span><\/span>contr\u00e1ria \u00e0 tend\u00eancia de descida<\/b><\/span><\/span><\/span> da moto e sua <\/b><\/span><\/span>rea\u00e7\u00e3o est\u00e1 na<\/b><\/span><\/span><\/span> <\/b>superf\u00edcie do cilindro.<\/b><\/span><\/span><\/span> Como a moto n\u00e3o se move na vertical (n\u00e3o sobe nem desce), as <\/b><\/span><\/span>for\u00e7a peso P e<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

de atrito F<\/b><\/span><\/span><\/span>at<\/b><\/span><\/span><\/sub><\/span> se anulam e n\u00e3o constituem par a\u00e7\u00e3o e rea\u00e7\u00e3o, pois s\u00e3o aplicadas no mesmo corpo.<\/b><\/span><\/span><\/span><\/p>\n

04.<\/b><\/span><\/span><\/span> <\/b>Nesse brinquedo a <\/b><\/span><\/span>for\u00e7a de atrito e a for\u00e7a peso constituem um par a\u00e7\u00e3o e<\/b><\/span><\/span><\/span> <\/b>rea\u00e7\u00e3o<\/b><\/span><\/span><\/span>, por\u00e9m \u00e9 essa <\/b><\/span><\/span>for\u00e7a que equilibra a for\u00e7a peso evitando que o motociclista caia.<\/b><\/span><\/span><\/span><\/p>\n

04. Falsa<\/b><\/span><\/span><\/span> \"\" as <\/b><\/span><\/span>for\u00e7a peso P e de atrito F<\/b><\/span><\/span><\/span>at<\/b><\/span><\/span><\/sub><\/span> se anulam e n\u00e3o constituem par a\u00e7\u00e3o e rea\u00e7\u00e3o, pois s\u00e3o<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

s\u00e3o aplicadas no mesmo corpo.<\/b><\/span><\/span><\/span><\/p>\n

08<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span> Nesse brinquedo a <\/b><\/span><\/span>for\u00e7a normal \u00e9 radial, e \u00e9 a for\u00e7a que a motocicleta exerce sobre a parede do cilindro.<\/b><\/span><\/span><\/span><\/p>\n

08. Correta<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span>normal <\/b><\/span><\/span><\/span>\u00e9 a for\u00e7a <\/b><\/span><\/span>trocada entre a parede do cilindro e a moto<\/b><\/span><\/span><\/span> que, pelo princ\u00edpio da a\u00e7\u00e3o e rea\u00e7\u00e3o \u00e9 <\/b><\/span><\/span>a mesma que a moto troca com a parede do cilindro.<\/b><\/span><\/span><\/span><\/p>\n

16.<\/b><\/span><\/span><\/span> <\/b>Nesse brinquedo a <\/b><\/span><\/span>for\u00e7a normal \u00e9 radial<\/b><\/span><\/span><\/span>, e \u00e9 a for\u00e7a que a <\/b><\/span><\/span>parede do cilindro exerce sobre a motocicleta<\/b><\/span><\/span><\/span><\/p>\n

16. Correta<\/b><\/span><\/span><\/span> \"\" veja 08.<\/b><\/span><\/span><\/p>\n

32.<\/b><\/span><\/span><\/span> <\/b>A <\/b><\/span><\/span>velocidade da motocicleta<\/b><\/span><\/span><\/span> depende do valor do <\/b><\/span><\/span>raio do cilindro, da acelera\u00e7\u00e3o da gravidade, e do coeficiente de atrito e \u00e9 calculada pela expressa por V=\u221aRg\/\u03bc.<\/b><\/span><\/span><\/span><\/p>\n

32. Correta<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span>as <\/b><\/span><\/span>for\u00e7as<\/b><\/span><\/span><\/span> que agem sobre a moto s\u00e3o <\/b><\/span><\/span>seu peso<\/b><\/span><\/span><\/span>\u00a0\"\"\u00a0e a <\/b><\/span><\/span>for\u00e7a de atrito<\/b><\/span><\/span><\/span> est\u00e1tico\u00a0\"\"\u00a0que ela troca com a parede do cilindro, <\/b><\/span><\/span>ambas verticais e que se equilibram<\/b><\/span><\/span><\/span>, pois a moto permanece parada na vertical.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

For\u00e7a resultante centr\u00edpeta — F<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span>=mV<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\/R<\/b><\/span><\/span><\/span>\u00a0\u00a0 —\u00a0 a m\u00ednima velocidade angular ocorre quando a moto est\u00e1 na <\/b><\/span><\/span>imin\u00eancia de escorregar<\/b><\/span><\/span><\/span> e, nesse caso a for\u00e7a de atrito \u00e9 m\u00e1xima e vale <\/b><\/span><\/span>F<\/b><\/span><\/span><\/span>at<\/b><\/span><\/span><\/sub><\/span>=<\/b><\/span><\/span><\/span> \u03bc<\/b><\/span><\/span><\/span>e<\/b><\/span><\/span><\/sub><\/span>.N=<\/b><\/span><\/span><\/span> \u03bc<\/b><\/span><\/span><\/span>e<\/b><\/span><\/span><\/sub><\/span>.F<\/b><\/span><\/span><\/span>C<\/b><\/span><\/span><\/sub><\/span>\u00a0 —\u00a0 F<\/b><\/span><\/span>at=<\/b><\/span><\/span><\/sub> \u03bc<\/b><\/span><\/span>e<\/b><\/span><\/span><\/sub>..mV<\/b><\/span><\/span>2<\/b><\/span><\/span><\/sup> <\/b>min<\/b><\/span><\/span><\/sub>\/R\u00a0 —\u00a0 F<\/b><\/span><\/span>at<\/b><\/span><\/span><\/sub>=P\u00a0 —\u00a0\u00a0<\/b><\/span><\/span>\u03bc<\/b><\/span><\/span>e<\/b><\/span><\/span><\/sub>.mV<\/b><\/span><\/span>2<\/b><\/span><\/span><\/sup> <\/b>min<\/b><\/span><\/span><\/sub>\/R\u00a0 =mg\u00a0 —\u00a0\u00a0 <\/b><\/span><\/span>V=\u221aRg\/\u03bc.<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/p>\n

R- (02 + 08 + 16 + 32) = 58<\/b><\/span><\/span><\/span><\/p>\n

03- <\/span><\/span><\/span>01.<\/b><\/span><\/span><\/span> <\/b>O movimento da bicicleta \u00e9 <\/b><\/span><\/span>retil\u00edneo e uniforme.<\/b><\/span><\/span><\/span><\/p>\n

01. Falsa<\/b><\/span><\/span><\/span> \"\" o enunciado afirma que a <\/b><\/span><\/span>acelera\u00e7\u00e3o do ciclista \u00e9 a<\/b><\/span><\/span><\/span>x<\/b><\/span><\/span><\/sub><\/span> = 4,0m\/s<\/b><\/span><\/span><\/span>2 <\/b><\/span><\/span><\/sup>e, ent\u00e3o o <\/b><\/span><\/span>movimento n\u00e3o \u00e9 uniforme.<\/b><\/span><\/span><\/span><\/p>\n

02.<\/b><\/span><\/span><\/span> <\/b>A <\/b><\/span><\/span>express\u00e3o matem\u00e1tica<\/b><\/span><\/span><\/span> que define a posi\u00e7\u00e3o da bicicleta \u00e9 <\/b><\/span><\/span>x <\/b><\/i><\/span><\/span><\/span>= 20+5<\/b><\/span><\/span><\/span>t <\/b><\/i><\/span><\/span><\/span>+ 4<\/b><\/span><\/span><\/span>t<\/b><\/i><\/span><\/span><\/span>2<\/b><\/i><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

02. Falsa<\/b><\/span><\/span><\/span> \"\" Colocando o <\/b><\/span><\/span>referencial<\/b><\/span><\/span><\/span> (origem da trajet\u00f3ria) no <\/b><\/span><\/span>ponto de \u00f4nibus<\/b><\/span><\/span><\/span> e orientando a<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

trajet\u00f3ria X para a direita<\/b><\/span><\/span><\/span> voc\u00ea ter\u00e1 \"\" <\/b><\/span><\/span>X = X<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> + V<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>t + at<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\/2 \"\" X = <\/b><\/span><\/span><\/span>20+5<\/b><\/span><\/span><\/span>t <\/b><\/i><\/span><\/span><\/span>+ 4<\/b><\/span><\/span><\/span>t<\/b><\/i><\/span><\/span><\/span>2<\/b><\/i><\/span><\/span><\/sup><\/span>\/<\/b><\/i><\/span><\/span><\/span>2 \"\" <\/b><\/span><\/span><\/span>X = <\/b><\/span><\/span><\/span>20+5<\/b><\/span><\/span><\/span>t <\/b><\/i><\/span><\/span><\/span>+ 2<\/b><\/span><\/span><\/span>t<\/b><\/i><\/span><\/span><\/span>2<\/b><\/i><\/span><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

04.<\/b><\/span><\/span><\/span> <\/b>A <\/b><\/span><\/span>for\u00e7a resultante<\/b><\/span><\/span><\/span> a qual o conjunto est\u00e1 sujeito \u00e9 <\/b><\/span><\/span>280N.<\/b><\/span><\/span><\/span><\/p>\n

04. Correta \"\" F<\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/sub><\/span> = ma = <\/b><\/span><\/span><\/span>70.4<\/b><\/span><\/span><\/span> \"\" F<\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/sub><\/span> = 280N.<\/b><\/span><\/span><\/span><\/p>\n

08.<\/b><\/span><\/span><\/span> <\/b>O <\/b><\/span><\/span>trabalho total<\/b><\/span><\/span><\/span> realizado sobre o <\/b><\/span><\/span>conjunto,<\/b><\/span><\/span><\/span> no intervalo de tempo de <\/b><\/span><\/span>0 a 2s, foi de 3600J.<\/b><\/span><\/span><\/span><\/p>\n

08. Falsa \"\" <\/b><\/span><\/span><\/span>t=0<\/b><\/span><\/span><\/span> \"\" X = X = <\/b><\/span><\/span><\/span>20+5<\/b><\/span><\/span><\/span>.0 <\/b><\/i><\/span><\/span><\/span>+ 2.<\/b><\/span><\/span><\/span>0<\/b><\/i><\/span><\/span><\/span>2<\/b><\/i><\/span><\/span><\/sup><\/span> = 20m \"\" <\/b><\/span><\/span><\/span>t = 2s<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span>X = <\/b><\/span><\/span><\/span>20+5<\/b><\/span><\/span><\/span>.2 <\/b><\/i><\/span><\/span><\/span>+ 2.<\/b><\/span><\/span><\/span>2<\/b><\/i><\/span><\/span><\/span>2<\/b><\/i><\/span><\/span><\/sup><\/span> = 38 m \"\"<\/b><\/i><\/span><\/span><\/span> d = <\/b><\/span><\/span><\/span>38 \u2013 20<\/b><\/span><\/span><\/span> = 18m \"\" W = F<\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/sub><\/span>.d = 280.18 \"\" W = 5040 J.<\/b><\/span><\/span><\/span><\/p>\n

16.<\/b><\/span><\/span><\/span> <\/b>A <\/b><\/span><\/span>quantidade de movimento<\/b><\/span><\/span><\/span> do conjunto no <\/b><\/span><\/span>instante 2s foi de 910kg.m\/s.<\/b><\/span><\/span><\/span><\/p>\n

16. Correta \"\" V = V<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span> + at = <\/b><\/span><\/span><\/span>5 + 4.2<\/b><\/span><\/span><\/span> = 13 m\/s \"\" Q = m.V = <\/b><\/span><\/span><\/span>70.13<\/b><\/span><\/span><\/span> \"\" Q = 910kg.m\/s.<\/b><\/span><\/span><\/span><\/p>\n

32.<\/b><\/span><\/span><\/span> <\/b>O <\/b><\/span><\/span>impulso<\/b><\/span><\/span><\/span> sofrido pelo conjunto no <\/b><\/span><\/span>intervalo de tempo de 0 a 2s foi de 910Ns;<\/b><\/span><\/span><\/span><\/p>\n

32. Falsa \"\" I = F<\/b><\/span><\/span><\/span>R<\/b><\/span><\/span><\/sub><\/span>.\u2206t = 280.2 \"\" I = 360 N.s.<\/b><\/span><\/span><\/span><\/p>\n

Soma (04 + 16) = 20<\/b><\/span><\/span><\/span><\/p>\n

04- <\/span><\/span><\/span>01.<\/b><\/span><\/span><\/span> <\/b>O <\/b><\/span><\/span>princ\u00edpio da conserva\u00e7\u00e3o da carga el\u00e9trica<\/b><\/span><\/span><\/span>, em que a <\/b><\/span><\/span>soma alg\u00e9brica de todas as cargas el\u00e9tricas existentes em sistema isolado, permanece sempre constante.<\/b><\/span><\/span><\/span><\/p>\n

01. \"\" Correta<\/b><\/span><\/span><\/span><\/p>\n

02. <\/b><\/span><\/span><\/span>Segundo a <\/b><\/span><\/span>Lei de Coulomb<\/b><\/span><\/span><\/span>, o <\/b><\/span><\/span>m\u00f3dulo da for\u00e7a<\/b><\/span><\/span><\/span> entre <\/b><\/span><\/span>duas cargas el\u00e9tricas puntiformes<\/b><\/span><\/span><\/span> \u00e9 <\/b><\/span><\/span>diretamente proporcional ao quadrado da dist\u00e2ncia entre elas.<\/b><\/span><\/span><\/span><\/p>\n

02. \"\" Falsa \"\" Enunciado da lei de Coulomb:\"\"<\/b><\/span><\/span><\/span><\/p>\n

04.<\/b><\/span><\/span><\/span> <\/b>Conforme a <\/b><\/span><\/span>Lei de Coulomb<\/b><\/span><\/span><\/span>, o <\/b><\/span><\/span>m\u00f3dulo da for\u00e7a entre duas cargas el\u00e9tricas puntiformes<\/b><\/span><\/span><\/span> \u00e9 <\/b><\/span><\/span>inversamente<\/b><\/span><\/span><\/span> proporcional ao produto das mesmas.<\/b><\/span><\/span><\/p>\n

Falsa<\/b><\/span><\/span><\/span> \"\" veja 02.<\/b><\/span><\/span><\/p>\n

08.<\/b><\/span><\/span><\/span> <\/b>De acordo com a <\/b><\/span><\/span>Lei de Faraday<\/b><\/span><\/span><\/span>, a <\/b><\/span><\/span>for\u00e7a eletromotriz induzida em uma espira fechada<\/b><\/span><\/span><\/span> \u00e9 dada pela <\/b><\/span><\/span>varia\u00e7\u00e3o do fluxo magn\u00e9tico dividido pela varia\u00e7\u00e3o do tempo com o sinal trocado.<\/b><\/span><\/span><\/span><\/p>\n

08. Correta<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span>\u201c O <\/b><\/span><\/span><\/span>m\u00f3dulo da for\u00e7a eletromotriz<\/b><\/span><\/span><\/span> induzida num circuito \u00e9 <\/b><\/span><\/span><\/span>igual \u00e0 raz\u00e3o entre a varia\u00e7\u00e3o do fluxo magn\u00e9tico nesse circuito, pelo intervalo de tempo em que essa varia\u00e7\u00e3o ocorre\u201d<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Eventualmente, devido \u00e0 lei de Lenz, que afirma que a <\/b><\/span><\/span><\/span>for\u00e7a eletromotriz induzida se op\u00f5e \u00e0 varia\u00e7\u00e3o de fluxo, costuma-se escrever a lei de Lenz da seguinte forma:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

16.<\/b><\/span><\/span><\/span> <\/b>Segundo a <\/b><\/span><\/span>Lei de Lenz<\/b><\/span><\/span><\/span>, o <\/b><\/span><\/span>sentido <\/b><\/span><\/span><\/span>de qualquer efeito de <\/b><\/span><\/span>indu\u00e7\u00e3o magn\u00e9tica \u00e9 tal que se op\u00f5e \u00e0 causa que produz esse efeito.<\/b><\/span><\/span><\/span><\/p>\n

16. Falsa<\/b><\/span><\/span><\/span> \"\"<\/b><\/span><\/span> \u00a0A <\/b><\/span><\/span><\/span>lei de Lenz<\/b><\/span><\/span><\/span> se refere ao <\/b><\/span><\/span><\/span>sentido da corrente el\u00e9trica induzida<\/b><\/span><\/span><\/span> afirmando que a <\/b><\/span><\/span><\/span>corrente el\u00e9trica induzida<\/b><\/span><\/span><\/span>, sempre tem sentido oposto as <\/b><\/span><\/span><\/span>linhas do campo magn\u00e9tico indutor<\/b><\/span><\/span><\/span>: <\/b><\/span><\/span><\/span>\u201c O sentido da corrente el\u00e9trica induzida \u00e9 tal que, por seus efeitos, op\u00f5e-se \u00e0 causa que lhe deu origem\u201d<\/b><\/span><\/span><\/span><\/p>\n

Soma (01 + 08) = 09<\/b><\/span><\/span><\/span><\/p>\n

05- <\/span><\/span><\/span>01.<\/b><\/span><\/span><\/span> <\/b>O \u00e2ngulo<\/b><\/span><\/span> <\/b>\u03b1<\/b><\/span><\/span><\/span> vale 110\u00b0.<\/b><\/span><\/span><\/span><\/p>\n

01. Correta<\/b><\/span><\/span><\/span> \"\" veja <\/b><\/span><\/span>figura<\/b><\/span><\/span><\/span> abaixo:<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

02.<\/b><\/span><\/span><\/span> <\/b>A <\/b><\/span><\/span>reflex\u00e3o da luz pode ser difusa ou especular<\/b><\/span><\/span><\/span>, mas as <\/b><\/span><\/span>leis da reflex\u00e3o s\u00f3 valem para a reflex\u00e3o especular<\/b><\/span><\/span><\/span><\/p>\n

02. Falsa<\/b><\/span><\/span><\/span> \"\" As <\/b><\/span><\/span>leis da reflex\u00e3o valem para os dois tipos de reflex\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

04.<\/b><\/span><\/span><\/span> <\/b>Uma das leis da reflex\u00e3o<\/b><\/span><\/span><\/span> coloca que o raio de <\/b><\/span><\/span>luz incidente, a reta normal e o raio de luz refletido<\/b><\/span><\/span><\/span> <\/b>s\u00e3o conc\u00eantricos, ou seja, pertencem ao mesmo plano<\/b><\/span><\/span><\/span><\/p>\n

04. Correta<\/b><\/span><\/span><\/span><\/p>\n

08.<\/b><\/span><\/span><\/span> <\/b>No fen\u00f4meno de <\/b><\/span><\/span>reflex\u00e3o, o \u00e2ngulo de incid\u00eancia<\/b><\/span><\/span><\/span> (entre o raio incidente e a reta normal) <\/b><\/span><\/span>\u00e9 sempre igual ao \u00e2ngulo de reflex\u00e3o (entre a reta normal e o raio refletido).<\/b><\/span><\/span><\/span><\/p>\n

08. Correta<\/b><\/span><\/span><\/span><\/p>\n

16.<\/b><\/span><\/span><\/span> <\/b>O <\/b><\/span><\/span>espelho<\/b><\/span><\/span><\/span> \u00e9 qualquer superf\u00edcie <\/b><\/span><\/span>plana onde ocorre a reflex\u00e3o especular<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/p>\n

16. Falsa<\/b><\/span><\/span><\/span> \"\" O <\/b><\/span><\/span>espelho<\/b><\/span><\/span><\/span> \u00e9 qualquer superf\u00edcie <\/b><\/span><\/span>plana ou <\/b><\/span><\/span><\/span>esf\u00e9rica<\/b><\/span><\/span><\/span> onde ocorre a reflex\u00e3o especular ou <\/b><\/span><\/span><\/span>difusa.<\/b><\/span><\/span><\/span><\/p>\n

32.<\/b><\/span><\/span><\/span> <\/b>As <\/b><\/span><\/span>leis da reflex\u00e3o<\/b><\/span><\/span><\/span> tamb\u00e9m se aplicam \u00e0 reflex\u00e3o de <\/b><\/span><\/span>objetos.<\/b><\/span><\/span><\/span><\/p>\n

32. Falsa<\/b><\/span><\/span><\/span> \"\" vale apenas para superf\u00edcies <\/b><\/span><\/span>espelhadas (refletoras).<\/b><\/span><\/span><\/span><\/p>\n

Soma (01 + 04 + 08) = 13<\/b><\/span><\/span><\/span><\/p>\n

 <\/p>\n

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

RESOLU\u00c7\u00d5ES 01- 01. O efeito fotoel\u00e9trico s\u00f3 ocorre a partir de uma frequ\u00eancia de corte, denominada fun\u00e7\u00e3o trabalho. 01- Correta A figura abaixo mostra o gr\u00e1fico da energia cin\u00e9tica do el\u00e9tron extra\u00eddo em fun\u00e7\u00e3o da frequ\u00eancia da radia\u00e7\u00e3o (f\u00f3ton, cor) incidente, para uma mesma placa met\u00e1lica (c\u00e9lula fotoel\u00e9trica). Observe que fo\u00a0\u00e9 a freq\u00fc\u00eancia m\u00ednima (frequ\u00eancia de corte, denominada fun\u00e7\u00e3o trabalho)<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":605,"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-607","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/607","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=607"}],"version-history":[{"count":2,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/607\/revisions"}],"predecessor-version":[{"id":609,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/607\/revisions\/609"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/605"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}