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Com relação às máquinas térmicas e a Segunda Lei da Termodinâmica, analise as proposições a seguir.
I - Máquinas térmicas são dispositivos usados para converter energia mecânica em energia térmica com consequente realização de trabalho.
II - O enunciado da Segunda Lei da Termodinâmica, proposto por Clausius, afirma que o calor não passa espontaneamente de um corpo frio para um corpo mais quente, a não ser forçado por um agente externo como é o caso do refrigerador.
III - É possível construir uma máquina térmica que, operando em transformações cíclicas, tenha como único efeito transformar completamente em trabalho a energia térmica de uma fonte quente.
IV - Nenhuma máquina térmica operando entre duas temperaturas fixadas pode ter rendimento maior que a máquina ideal de Carnot, operando entre essas mesmas temperaturas.
São corretas apenas
Considere uma prancha homogênea de peso P e comprimento L que se encontra equilibrada horizontalmente em duas hastes A e B como mostra a figura 1 abaixo.
Sobre a prancha, em uma posição x < L/2, é colocado um recipiente de massa desprezível e volume V, como mostrado na figura 2. Esse recipiente é preenchido lentamente com um líquido homogêneo de densidade constante até sua borda sem transbordar.
Nessas condições, o gráfico que melhor representa a
intensidade da reação do apoio B, RB, em função da razão
entre o volume V’ do líquido contido no recipiente pelo
volume V do recipiente, V’/ V, é
A tabela a seguir resume alguns dados sobre dois satélites de Júpiter.
Sabendo-se que o período orbital de Io é de
aproximadamente 1,8 dia terrestre, pode-se afirmar que o
período orbital de Europa expresso em dia(s) terrestre(s), é
um valor mais próximo de
De acordo com a figura abaixo, a partícula A, ao ser abandonada de uma altura H, desce a rampa sem atritos ou resistência do ar até sofrer uma colisão, perfeitamente elástica, com a partícula B que possui o dobro da massa de A e que se encontra inicialmente em repouso. Após essa colisão, B entra em movimento e A retorna, subindo a rampa e atingindo uma altura igual a
Os vetores 
, na figura abaixo, representam,
respectivamente, a velocidade do vento e a velocidade de
um avião em pleno voo, ambas medidas em relação ao solo.
Sabendo-se que o movimento resultante do avião acontece
em uma direção perpendicular à direção da velocidade do
vento, tem-se que o cosseno do ângulo θ entre os vetores
velocidades 
vale
Um bloco se movimenta retilineamente, do ponto A até o ponto C, conforme figura abaixo.
Sua velocidade v em função do tempo t, ao longo da trajetória, é descrita pelo diagrama v x t mostrado abaixo.
Considerando que o bloco passa pelos pontos A e B nos
instantes 0 e t1, respectivamente, e para no ponto C no
instante t2, a razão entre as distâncias percorridas pelo bloco nos trechos 
, vale
Murderesses Velma Kelly (a woman who killed her husband and sister after finding them in bed together) and Roxie Hart (who killed her boyfriend when she discovered he wasn't going to make her a star) find themselves on death row together and fight for the fame that will keep them from the gallows, in 1920s musical Chicago.
Adapted from http://www.imdb.com/title/tt0299658/plotsummary
Murderesses Velma Kelly (a woman who killed her husband and sister after finding them in bed together) and Roxie Hart (who killed her boyfriend when she discovered he wasn't going to make her a star) find themselves on death row together and fight for the fame that will keep them from the gallows, in 1920s musical Chicago.
Adapted from http://www.imdb.com/title/tt0299658/plotsummary
Observe the fragment taken from the blues Blow Wind Blow (Muddy Waters, Paul Butterfield)
When the sun rose this morning,
I didn't have my baby by my side.
When the sun rose this morning,
I didn't have my baby by my side.
I don't know where she was,
I know she's out with some another guy.
Observe the fragment taken from the blues Blow Wind Blow (Muddy Waters, Paul Butterfield)
When the sun rose this morning,
I didn't have my baby by my side.
When the sun rose this morning,
I didn't have my baby by my side.
I don't know where she was,
I know she's out with some another guy.
Observe the fragment taken from the blues Blow Wind Blow (Muddy Waters, Paul Butterfield)
When the sun rose this morning,
I didn't have my baby by my side.
When the sun rose this morning,
I didn't have my baby by my side.
I don't know where she was,
I know she's out with some another guy.
How to Become a Stunt Double
A stunt double stands in for the actor when the action or fight scene gets dangerous or goes beyond the capabilities of the actor. To become a stunt double, you must be in excellent physical condition and have special skills.
1. Exercise regularly if you want to become a stunt double. Eat nutritiously for optimal health and strength.
2. Take lots of lessons because the more skills you have, the better. Gymnastics is extremely important in becoming a stunt double. Get good at trampoline, skateboarding, swimming and high board diving. Take scuba diving lessons. Practice rock climbing and horseback riding. Learn to water ski and snow ski.
3. Enroll in martial arts classes, especially judo. Judo is excellent for learning how to break falls.
4. Get training in CPR(1) and First Aid. This training looks good on a résumé, especially for stunt double careers. Injuries happen.
5. Have valid driver's licenses for both car and motorcycle. Take advanced driving classes so you'll be qualified for difficult driving scenes.
6. Move to Hollywood and plan to work your way up from the bottom. You must get into the Screen Actors Guild(2) and have a union card(3) .
Taken from Google
(1) Cardiopulmonary resuscitation.
(2) Annual prize promoted by the American Syndicate of Actors.
(3) A card certifying membership in an organization.
How to Become a Stunt Double
A stunt double stands in for the actor when the action or fight scene gets dangerous or goes beyond the capabilities of the actor. To become a stunt double, you must be in excellent physical condition and have special skills.
1. Exercise regularly if you want to become a stunt double. Eat nutritiously for optimal health and strength.
2. Take lots of lessons because the more skills you have, the better. Gymnastics is extremely important in becoming a stunt double. Get good at trampoline, skateboarding, swimming and high board diving. Take scuba diving lessons. Practice rock climbing and horseback riding. Learn to water ski and snow ski.
3. Enroll in martial arts classes, especially judo. Judo is excellent for learning how to break falls.
4. Get training in CPR(1) and First Aid. This training looks good on a résumé, especially for stunt double careers. Injuries happen.
5. Have valid driver's licenses for both car and motorcycle. Take advanced driving classes so you'll be qualified for difficult driving scenes.
6. Move to Hollywood and plan to work your way up from the bottom. You must get into the Screen Actors Guild(2) and have a union card(3) .
Taken from Google
(1) Cardiopulmonary resuscitation.
(2) Annual prize promoted by the American Syndicate of Actors.
(3) A card certifying membership in an organization.
How to Become a Stunt Double
A stunt double stands in for the actor when the action or fight scene gets dangerous or goes beyond the capabilities of the actor. To become a stunt double, you must be in excellent physical condition and have special skills.
1. Exercise regularly if you want to become a stunt double. Eat nutritiously for optimal health and strength.
2. Take lots of lessons because the more skills you have, the better. Gymnastics is extremely important in becoming a stunt double. Get good at trampoline, skateboarding, swimming and high board diving. Take scuba diving lessons. Practice rock climbing and horseback riding. Learn to water ski and snow ski.
3. Enroll in martial arts classes, especially judo. Judo is excellent for learning how to break falls.
4. Get training in CPR(1) and First Aid. This training looks good on a résumé, especially for stunt double careers. Injuries happen.
5. Have valid driver's licenses for both car and motorcycle. Take advanced driving classes so you'll be qualified for difficult driving scenes.
6. Move to Hollywood and plan to work your way up from the bottom. You must get into the Screen Actors Guild(2) and have a union card(3) .
Taken from Google
(1) Cardiopulmonary resuscitation.
(2) Annual prize promoted by the American Syndicate of Actors.
(3) A card certifying membership in an organization.
One of the instructions below IS NOT stated in the text. Choose it.
In order to become a stunt double you
How to Become a Stunt Double
A stunt double stands in for the actor when the action or fight scene gets dangerous or goes beyond the capabilities of the actor. To become a stunt double, you must be in excellent physical condition and have special skills.
1. Exercise regularly if you want to become a stunt double. Eat nutritiously for optimal health and strength.
2. Take lots of lessons because the more skills you have, the better. Gymnastics is extremely important in becoming a stunt double. Get good at trampoline, skateboarding, swimming and high board diving. Take scuba diving lessons. Practice rock climbing and horseback riding. Learn to water ski and snow ski.
3. Enroll in martial arts classes, especially judo. Judo is excellent for learning how to break falls.
4. Get training in CPR(1) and First Aid. This training looks good on a résumé, especially for stunt double careers. Injuries happen.
5. Have valid driver's licenses for both car and motorcycle. Take advanced driving classes so you'll be qualified for difficult driving scenes.
6. Move to Hollywood and plan to work your way up from the bottom. You must get into the Screen Actors Guild(2) and have a union card(3) .
Taken from Google
(1) Cardiopulmonary resuscitation.
(2) Annual prize promoted by the American Syndicate of Actors.
(3) A card certifying membership in an organization.
After reading the first item of the instructions, mark the option that completes the gap in the converted sentence below.
“If you want to become a stunt double you ________ exercise regularly.”
How to Become a Stunt Double
A stunt double stands in for the actor when the action or fight scene gets dangerous or goes beyond the capabilities of the actor. To become a stunt double, you must be in excellent physical condition and have special skills.
1. Exercise regularly if you want to become a stunt double. Eat nutritiously for optimal health and strength.
2. Take lots of lessons because the more skills you have, the better. Gymnastics is extremely important in becoming a stunt double. Get good at trampoline, skateboarding, swimming and high board diving. Take scuba diving lessons. Practice rock climbing and horseback riding. Learn to water ski and snow ski.
3. Enroll in martial arts classes, especially judo. Judo is excellent for learning how to break falls.
4. Get training in CPR(1) and First Aid. This training looks good on a résumé, especially for stunt double careers. Injuries happen.
5. Have valid driver's licenses for both car and motorcycle. Take advanced driving classes so you'll be qualified for difficult driving scenes.
6. Move to Hollywood and plan to work your way up from the bottom. You must get into the Screen Actors Guild(2) and have a union card(3) .
Taken from Google
(1) Cardiopulmonary resuscitation.
(2) Annual prize promoted by the American Syndicate of Actors.
(3) A card certifying membership in an organization.
Observe the cartoon and answer the question about it.
The first boy
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