Foram encontradas 100 questões.
Um corpo de massa m está a uma altura H em relação ao solo. Considerando uma plataforma de altura h em relação ao solo, conforme a figura, podemos afirmar, corretamente, que a energia potencial gravitacional do corpo, em relação à plataforma, é dada por
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Before the second World War, travel was difficult to organize, expensive and sometimes dangerous.
Nowadays, people can easily organize their next trip anywhere in the world through a travel agent. If you shop around, many travel agents can offer you cheap package tours to many popular destinations depending on the season. Air travel is generally more expensive towards the end of the year, during the Christmas and holiday season. This is the peak period for travel, and people often make travel reservations several months in advance. If you want to avoid peak travel periods, make your travel arrangements during the off-peak periods.
Off-peak periods are a good time to travel as it is usually quieter and cheaper. Sometimes, you can get air, sea or train tickets to see many popular tourist attractions in the world for half price!
Many young people try to avoid the crowd when they travel, and they often prefer to travel off the beaten track. They often have shoestring budgets and travel by hitch-hiking rather than public transport. They also like to stay at youth hostels and meet other young travellers.
Older people and families often have a bigger budget.
They usually like to go on packaged tours and have all of their travel arrangements organized by the tour operator. Families prefer to book their holidays at a resort, often near a lake or close to the beach, where there are lots of activities for the children to enjoy.
GLOSSARY:
avoid: evitar
off the beaten track: lugar onde poucas vão
budget: orçamento
shoestring : com pouco dinheiro
youth hostel : albergue
The extract states that, unlike young people, older people
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How horses can sleep standing up and
not fall over?
Most of us need eight hours sleep a night. Horses can get by with only half that amount – and unlike us they are able to fall asleep standing up, without falling over!
In the wild, horses are prey to wolves and other animals. Lying down, they are much more vulnerable than they are standing up. So over millions of years their bodies have developed a way of staying upright even when they are asleep.
Although most horses no longer live in the wild, they can still fall asleep as their ancestors used to.
The reason they are able to do this is a unique system of ligaments – the cords which bind bones together . A horse’s ligaments act like a sling over its whole body. These can lock its joints into a fixed position, so it can stand upright without any conscious muscular effort while it sleeps. It is a pity human beings have not developed a way of doing this. It could be very handy for long queues or travelling on crowded trains!
GLOSSARY:
prey: presa
(to)bind: atar; ligar; amarrar
sling: ligadura
like: como
queue: fila
“handy”, means
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O gráfico a seguir representa a deformação de duas molas, A e B, de mesmo comprimento, quando submetidas a esforços dentro de seus limites elásticos.
Assim sendo, pode-se concluir, corretamente que, se as molas forem comprimidas igualmente,
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I am just like any typical physicist. My office may look messy, but I know where every atom is.
“messy”, underlined in the excerpt, means
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Leia:
Ninguém nunca soube onde ele escondeu as moedas de ouro. Alguns afirmam que as enterrou perto do rio, mas todos têm certeza de que a fortuna não foi roubada da família.
As orações em destaque classificam-se, respectivamente, como subordinada
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The Horse and the Donkey
One day, a man went on a journey, and took with him his horse and his donkey. He put a very heavy load on the donkey’s back, but nothing on the horse’s back. After a while, the poor donkey asked the horse to help him. But the horse, who was very selfish, refused.
Further along the road, the donkey started to feel very tired, and again asked the horse to take some of the load. And again the horserefused.
Finally, the donkey fell exhausted at the side of the road and died.
So the man took the whole of the heavy load and put it on the horse’s back, together with the skin of the dead donkey, and they continued on their journey.
What is the moral of this fable?
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In China the government is fighting to save a national symbol – the giant panda. There are very few pandas today and they are running a big risk of extinction.
Pandas are vegetarians. They live in the mountains of central China, in forests of pine trees and bamboo. Pandas eat flowers, grass, and sometimes small animals and honey. But bamboo is their main food. Because their digestive tracts extract little nutritive value from the plant, they consume enormous amounts, spending 50 to 75 percent of the day eating. A giant panda needs 20 kilos of bamboo a day, and he eats for about 15 hours!
Scientists are making a special study of the panda, its way of life, home, and food. They are also trying to breed pandas in new zoos, and to grow different kinds of bamboo in special natural reserves for pandas. Man, the principal problem for animals, is starting to work with nature. But there isn’t much time. Are we doing enough to save wild animals?
All the alternatives are correct EXCEPT,
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Um copo de volume “V”, altura “h” e área da base “A” é preenchido de água até transbordar. Posteriormente, coloca-se esse copo sobre uma balança cuja mola é comprimida de um valor igual a “x”. Considerando a aceleração da gravidade igual a “g” e a densidade da água igual a !$ \mu !$, a expressão que determina a constante elástica da mola é dada por
OBS: Despreze o peso do copo.
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Dois lados de um triângulo medem 6 cm e 8 cm, e formam um ângulo de 60º. A medida do terceiro lado desse triângulo, em cm, é
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