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Cada uma das figuras (1, 2, 3 e 4) a seguir indica uma espira condutora ideal e o sentido da corrente elétrica (i) induzida na espira. Cada figura indica também um ímã, seus polos (N = polo norte e S = polo sul) e o vetor deslocamento de aproximação ou afastamento do ímã em relação à espira.
Assinale a alternativa que indica as figuras que estão corretas conforme as Leis de Faraday e Lenz.
Em um laboratório de Física foram realizadas duas experiências com condutores elétricos:
1 – Na primeira, mediu-se a resistência elétrica de um condutor cilíndrico C1, constituído de um material metálico, ôhmico, de comprimento L e área transversal S. O valor obtido foi R1.
2 – Na segunda, mediu-se a resistência elétrica da associação em paralelo de quatro condutores cilíndricos, C2a, C2b, C2c e C2d, todos constituídos do mesmo material de C1, cada um com o mesmo comprimento L de C1 e cada um com um quarto (¼) da área transversal S, de C1. O valor obtido foi R2.
Nessas condições, quanto vale a razão R1/R2?
Sobre uma bancada de um laboratório, foram dispostos um condutor retilíneo R e três espiras condutoras circulares A, B e C, conforme a disposição mostrada na figura a seguir.
Considere que:
1 – não há contato elétrico entre a espira B e o condutor R, todas as espiras estão tangentes à linha tracejada, o condutor retilíneo está perpendicular à linha tracejada e também sobre o centro da espira B;
2 – foram omitidas no desenho as fontes geradoras das correntes elétricas;
3 – adotou-se o sentido convencional da corrente elétrica;
4 – as correntes elétricas nas bobinas têm a mesma intensidade i e no condutor retilíneo tem a intensidade iR;
5 – o condutor retilíneo e as espiras são considerados ideais, coplanares e de espessuras desprezíveis.
Nas condições geométricas citadas acima, sem alterar os sentidos das correntes elétricas indicadas na figura e considerando somente as regiões no centro das espiras, se for ajustada somente a intensidade da corrente iR, em uma determinada relação de iR/i, será possível o campo magnético gerado por iR anular o campo gerado _______.
Um corpo de massa igual a 80 kg, após sair do repouso, percorre uma pista retilínea e horizontal até colidir a 108 km/h com um anteparo que está parado. Qual o valor, em metros, da altura que este corpo deveria ser abandonado, em queda livre, para que ao atingir o solo tenha o mesmo valor da energia mecânica do corpo ao colidir com o anteparo?
Adote a aceleração da gravidade no local igual a 10 m/s2 .
O avião atinge uma determinada altitude (ponto A) e a partir dela aumenta sua velocidade sob uma aceleração de 2 vezes o módulo da aceleração da gravidade. Próximo de atingir o ponto B, o avião diminui o módulo da força produzida pelo motor até se igualar a resistência do ar e, a partir do ponto B, inicia um lançamento oblíquo até D.
Uma vez que a pessoa não está presa a nenhuma parte do avião e que também realiza um lançamento oblíquo com a mesma velocidade inicial do avião a partir de B, pode-se afirmar corretamente que o módulo da força normal do piso do avião contra a força peso da pessoa no trecho de B a D é ______.
No sistema representado na figura a seguir, tem-se dois corpos A e B, sendo que o corpo A tem massa igual a 10 kg e o sistema está em equilíbrio estático. Esse sistema é composto por cordas ideais (massas desprezíveis e inextensíveis), além disso, na corda 2 tem-se uma tração de intensidade igual a 300 N.
Admitindo a aceleração da gravidade no local igual a 10 m/s2
,
determine, respectivamente, em kg, a massa do corpo B e, em N, o
valor da intensidade da tração na corda 4, que prende o corpo B ao
corpo A.
Em um recente trabalho, os pesquisadores de uma instituição concluíram que 500 mL do total de água pura utilizada durante o processo de fabricação de um copo plástico são “perdidos” devido a mudança do estado líquido para o estado de vapor a 100 °C. Em termos de energia, essa quantidade de água pura “perdida” equivale, em calorias, a ____.
Considere:
1 – que a água pura, antes de entrar no processo de fabricação, está a 25 °C;
2 – calor específico da água pura igual a 1 cal/g°C;
3 – calor latente de vaporização da água pura igual a 540 cal/g; e
4 – a densidade da água pura igual a 1 g/cm³.
Dentro de um recipiente encontra-se uma vasilha flutuando sobre um líquido em repouso. No fundo dessa vasilha há um objeto maciço, homogêneo e com densidade maior que a do líquido. Olhando essa cena, um professor se imagina retirando o objeto da vasilha e abandonando-o sobre a superfície do líquido. O professor esboça quatro desenhos (A, B, C e D) que representam o objeto no fundo da vasilha (posição A) e três posições (B, C e D) do objeto durante seu deslocamento até o fundo do recipiente. O professor, propositadamente, não se preocupa em desenhar corretamente o nível do líquido. Em seguida, mostra esses desenhos aos seus alunos e pergunta a eles em qual das posições (A, B, C ou D) o volume do líquido deslocado pelo objeto é maior.
Entre as alternativas, assinale aquela que indica a resposta correta à pergunta do professor.
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Reasons why the Airbus A380 failed
On 14 February 2019, Airbus announced their A380s have been cancelled, with production ending in 2021. After 12 years of shaky business and development, its closure didn’t come as a surprise. The dream is over for the world’ largest passenger airliner. Why was the king of the airliners forced to land so quikly? Here’s what happened:
- poor business planing finds itself at the heart of the A380’s downfall. Most of all A380’ eggs were put in a basket called Emirates, Airbus biggest buyer.
- bigger isn’t always better. With a wingspan of almost 80 meters was difficult to guide the giant four-turbine around airports.
- airbus failed to antecipate how consumer’s tastes in air travel would change over the years. Passengers nowadays prefer smaller airports, using direct routes to their destinations.
- although a seating capacity of 800 may seem impressive at first, it is not easy to fill them up, even when you give discounts and make promotions.
Airbus A380’ closure perhaps teaches us all a lesson or two. Dream big, but keep your feet on the ground.
Adapted from https://www.slashgerar.com.
Read the text and answer question.
Reasons why the Airbus A380 failed
On 14 February 2019, Airbus announced their A380s have been cancelled, with production ending in 2021. After 12 years of shaky business and development, its closure didn’t come as a surprise. The dream is over for the world’ largest passenger airliner. Why was the king of the airliners forced to land so quikly? Here’s what happened:
- poor business planing finds itself at the heart of the A380’s downfall. Most of all A380’ eggs were put in a basket called Emirates, Airbus biggest buyer.
- bigger isn’t always better. With a wingspan of almost 80 meters was difficult to guide the giant four-turbine around airports.
- airbus failed to antecipate how consumer’s tastes in air travel would change over the years. Passengers nowadays prefer smaller airports, using direct routes to their destinations.
- although a seating capacity of 800 may seem impressive at first, it is not easy to fill them up, even when you give discounts and make promotions.
Airbus A380’ closure perhaps teaches us all a lesson or two. Dream big, but keep your feet on the ground.
Adapted from https://www.slashgerar.com.
According to the text, choose the alternative that best complete the sentence.
Airbus A380 _________________.
Read the text and answer question.
Reasons why the Airbus A380 failed
On 14 February 2019, Airbus announced their A380s have been cancelled, with production ending in 2021. After 12 years of shaky business and development, its closure didn’t come as a surprise. The dream is over for the world’ largest passenger airliner. Why was the king of the airliners forced to land so quikly? Here’s what happened:
- poor business planing finds itself at the heart of the A380’s downfall. Most of all A380’ eggs were put in a basket called Emirates, Airbus biggest buyer.
- bigger isn’t always better. With a wingspan of almost 80 meters was difficult to guide the giant four-turbine around airports.
- airbus failed to antecipate how consumer’s tastes in air travel would change over the years. Passengers nowadays prefer smaller airports, using direct routes to their destinations.
- although a seating capacity of 800 may seem impressive at first, it is not easy to fill them up, even when you give discounts and make promotions.
Airbus A380’ closure perhaps teaches us all a lesson or two. Dream big, but keep your feet on the ground.
Adapted from https://www.slashgerar.com.
Read the text and answer question.
Iceberg ruptures in Patagonia raise alarm about global warming
Fabian Andres Cambero
Two new icebergs have broken off from the Grey Glacier in Chile’s Patagonia in recent weeks. Scientists have linked the increased frequency ice breaks to rising temperature. According to Ricardo Jana, researcher and member of the climate change area of the Chilean Antartic Institute (INACH) “In recent years temperature rises above the normal average and intense rainfall were registered with an increase in water level in the lake, factors that could explain the separation. Reseachers from universities in Germany and Brazil, together with experts from INACH and other local entities, have been studing the Grey Glacier since 2015.
http://independent.co.uk
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Iceberg ruptures in Patagonia raise alarm about global warming
Fabian Andres Cambero
Two new icebergs have broken off from the Grey Glacier in Chile’s Patagonia in recent weeks. Scientists have linked the increased frequency ice breaks to rising temperature. According to Ricardo Jana, researcher and member of the climate change area of the Chilean Antartic Institute (INACH) “In recent years temperature rises above the normal average and intense rainfall were registered with an increase in water level in the lake, factors that could explain the separation. Reseachers from universities in Germany and Brazil, together with experts from INACH and other local entities, have been studing the Grey Glacier since 2015.
http://independent.co.uk
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Investigators find “similarities” between Ethiopian and Lion Air crashes.
Anna Cardovillis, Kara fox and Dakin Andone
Preliminary data recovered from the black boxes of the last week Ethiopian Airlines crash has revealed “similarities” to October ‘s fatal Lion Air crash.
Ethiopian Airlines flight 302 crashed March 10, six minutes after take off, killing all 157 people on board. It was the second disaster involving a new Boeing 737 Max 8 aircraft in less than six months. In October, all 189 people on board Lion Air Flight were killed in Indonesia, 13 minutes after take off. Similarities between the two incidents led aviation authorities around the world to ban the use of 737 Max 8s. Investigators suspect the Lion Air crash may have been caused by an angle of attack sensor on the outside of the plane that transmited incorrect data, which could have triggered the automated flight software that forced the plane’s nose down. The pilots first manually corrected an “automatic aircraft nose down two minutes after take off and performed the same procedure again and again before the plane hurtled into the Java Sea.
http://wwww.slashgear.com.
Read the text and answer question.
Investigators find “similarities” between Ethiopian and Lion Air crashes.
Anna Cardovillis, Kara fox and Dakin Andone
Preliminary data recovered from the black boxes of the last week Ethiopian Airlines crash has revealed “similarities” to October ‘s fatal Lion Air crash.
Ethiopian Airlines flight 302 crashed March 10, six minutes after take off, killing all 157 people on board. It was the second disaster involving a new Boeing 737 Max 8 aircraft in less than six months. In October, all 189 people on board Lion Air Flight were killed in Indonesia, 13 minutes after take off. Similarities between the two incidents led aviation authorities around the world to ban the use of 737 Max 8s. Investigators suspect the Lion Air crash may have been caused by an angle of attack sensor on the outside of the plane that transmited incorrect data, which could have triggered the automated flight software that forced the plane’s nose down. The pilots first manually corrected an “automatic aircraft nose down two minutes after take off and performed the same procedure again and again before the plane hurtled into the Java Sea.
http://wwww.slashgear.com.
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The Magic of Potter
There was a time when no one knew the name Harry Potter. Now the adventures of this extraordinary student at Hogwarts School of Witchcraft and Wizardry are read in over 45 languages, including Russian, Thai, and even ancient Greek. No one can explain the Harry Potter Phenomenon – not even J. K. Rowling, his creator.
J. K. Rowling was born in England in 1965. From a young age, she knew she wanted to be a writer. When she was 6, she wrote her first story – about a rabbit that gets sick. In 1990, on a trip to London, she got the idea for the boy wizard. She soon created a whole cast of unique characters to help Harry battle the forces of darkness. She kept working on the story while she was teaching English in Portugal. She finished the first book in the series, Harry Potter and the Sorcerer’s Stone, in 1995 and published it in 1997. Harry Potter and the Sorcerer’s Stone became an unexpected bestseller.
Adapted from Interchange.
H. P. = Harry Potter
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The Magic of Potter
There was a time when no one knew the name Harry Potter. Now the adventures of this extraordinary student at Hogwarts School of Witchcraft and Wizardry are read in over 45 languages, including Russian, Thai, and even ancient Greek. No one can explain the Harry Potter Phenomenon – not even J. K. Rowling, his creator.
J. K. Rowling was born in England in 1965. From a young age, she knew she wanted to be a writer. When she was 6, she wrote her first story – about a rabbit that gets sick. In 1990, on a trip to London, she got the idea for the boy wizard. She soon created a whole cast of unique characters to help Harry battle the forces of darkness. She kept working on the story while she was teaching English in Portugal. She finished the first book in the series, Harry Potter and the Sorcerer’s Stone, in 1995 and published it in 1997. Harry Potter and the Sorcerer’s Stone became an unexpected bestseller.
Adapted from Interchange.
H. P. = Harry Potter
Read the text and answer question.
The Magic of Potter
There was a time when no one knew the name Harry Potter. Now the adventures of this extraordinary student at Hogwarts School of Witchcraft and Wizardry are read in over 45 languages, including Russian, Thai, and even ancient Greek. No one can explain the Harry Potter Phenomenon – not even J. K. Rowling, his creator.
J. K. Rowling was born in England in 1965. From a young age, she knew she wanted to be a writer. When she was 6, she wrote her first story – about a rabbit that gets sick. In 1990, on a trip to London, she got the idea for the boy wizard. She soon created a whole cast of unique characters to help Harry battle the forces of darkness. She kept working on the story while she was teaching English in Portugal. She finished the first book in the series, Harry Potter and the Sorcerer’s Stone, in 1995 and published it in 1997. Harry Potter and the Sorcerer’s Stone became an unexpected bestseller.
Adapted from Interchange.
H. P. = Harry Potter
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