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A maioria das substâncias tende a diminuir de volume (contração) com a diminuição da temperatura e tendem a aumentar de volume (dilatação) com o aumento da temperatura. Assim, desconsiderando as exceções, quando diminuímos a temperatura de uma substância, sua densidade tende a Obs.: Considere a pressão constante.
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Leia o texto a seguir:
Rosa acaba de receber a visita da prima Ana, que a convidou para irem a casa de seus avós. Elas iriam a pé, uma vez que a casa fica a poucos metros dali.
Entre as ocorrências destacadas, deve(m) receber o acento indicativo da crase
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Are there really squirrels in Australia that can fly?
Yes?!? But they do not have wings. Nor do they go around in aeroplanes. Strictly speaking, they do not “fly” . They glide on air currents from the branches of one tree to the next. Lots of squirrels are good jumpers, but these Australian ones have the edge over all the others.
They have a large flap of skin round their bodies, which joins their front and back legs. When they launch themselves off a branch, they spread out their legs. The skin flap spreads out , and forms a sort of parachute. Kitted out like this, flying squirrels can glide quite long distances. They wouldn’t think anything of launching out on a flight of forty or fifty metres.
GLOSSARY:
launch one’s off = lançar-se
kit out = prover
In “... these Australian ones have the edge over all the others.”, it means that
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The air pranks
If you have “aviophobia”, turbulence is probably the common reason for that. Most people believe that turbulence is dangerous. In fact, during turbulence, the pilots remain in complete control of the aircraft, and it is no harder to fly an aircraft during turbulence than it is in normal flight.
The movement of the air causes turbulence. There are three types of weather often associated with turbulence. Firstly strong winds close to the ground, storm clouds and clear air turbulence.
The important thing to remember is that turbulence is uncomfortable but not dangerous and that weather maps and reports show pilots where the areas of turbulence can be expected so that they can be avoided by climbing, descending or flying around them.
Crew working onboard the plane are highly trained to cope with this situation.
Remember: Always secure your seat belt as tightly as you can in turbulence as it helps you feel more comfortable. Put your seat belt on even when not instructed to wear it. It can be tempting to take off your seat belt, when you want to be more comfortable.
Pilots can usually antecipate turbulence, sometimes it’s sudden, and sometimes it’s severe. There have been cases of serious injuries to passengers who were not seated and with their seat belts duly fastened.
Most people aren’t keen on flying, owing to turbulence jolts.
“Relax and fly” shows that there are effective ways to overcome this unfounded fear, when one flies in this extremely safe mode of transportation.
GLOSSARY:
pranks= rebeldias
“aviophobia”, means
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Choose the best answer to have these proverbs completed.
1- Never judge a book by its .
2- Take care of the pence and the will take care of themselves.
3- Don’t count your chickens before they are .
4- Never look a gift horse in the .
5- Don’t put all your in one basket.
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Para x.y !$ ≠ !$ 0, a expressão !$ \large y^2 \ cos 180º - xy \ sen 270º +y^2 \ sen 90º \over x^2 \ cos0º !$ equivale a
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Assinale a alternativa em que o termo destacado classifica-se como pronome relativo e, por isso, introduz oração subordinada adjetiva.
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Sejam f e g duas funções reais inversas entre si. Se f(x) = 3x – 2, então g(1) é igual a
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Recoloque os termos retirados do poema abaixo, observando, pelo significado que assumem no contexto em que se inserem, a correta e respectiva grafia.
“........... imagens delirantes
Maísa podia não gostar ............
o poema”
(Manuel Bandeira )
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Sejam as matrizes A!$ _{mx3} !$, B!$ _{pxq} !$ e C!$ _{5x3} !$. Se A . B = C, então m + p + q é igual a
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