Foram encontradas 100 questões.
Sejam uma circunferência de centro O e um ponto A exterior a ela. Considere !$ \overline{AT} !$ um segmento tangente à circunferência, em T.
Se o raio da circunferência mede 4 cm e AT = !$ 8\sqrt{2} !$ cm , então a medida de !$ \overline{AO} !$, em cm, é
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A sign of the times
Imagine that you are taking a peaceful walk in the British countryside, when suddenly you hear the annoying sound of mobile phones going off all around you. Before you start looking for any loquacious human culprits, maybe you should look to the trees instead. The Royal Society for the Protection of Birds has found that British birds, such as starlings, are mimicking the noise of cell phone ringing tones. Mike Everett, a spokesman for the society, says that birds have long imitated manmade sounds from human whistling to car brakes screeching.
GLOSSARY:
starlings = estorninho (tipo de pássaro)
loquacious = falador, loquaz, tagarela
spokesman = porta-voz
culprit = situações perturbadoras
screeching = som de freada brusca
“annoying”, is
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I always wanted a car and thought that having one would make my life easier. I still remember the day I bought the car - my car! - and drove it home. It was the happiest day of my life... and then everything went wrong.
First of all, I got a ticket for speeding. I was so excited about driving my new car that I didn’t realize how fast I was going. Later, when I got home, there was nowhere to park on the street. I looked for parking for almost thirty minutes. Finally, I found a place – six blocks from my house! The next morning, I decided to drive to school. The traffic was terrible and I was fifteen minutes late for class. All this happened in the first twenty-four hours of owning a car!
By the end of the first year, I was almost $2,000 in debt. I needed money for car payments, gas and insurance. It was crazy! In the end, I had to sell the car to pay my bills.
So what’s the moral of the story? If you don’t need a car, don’t buy one. It would be a terrible mistake!
According to the author, a terrible mistake is to
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Em “Cresce o número de assaltos a ônibus intermunicipais. Isso não só inibe os cidadãos como também os apavora.”, há
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Se f(x) = mx2 + (2m – 1)x + (m – 2) possui um zero real duplo, então o valor de m é
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I just looked in the mirror, and I saw an overweight woman looking back at me. Who is she? Is that really me? I am sad to say I am one of the many Americans who does not do enough physical activity.
We are gaining weight and in danger of having health problems.
We also eat too many high-calorie foods.
I’m not a “couch potato”, but my friend Joey is. His idea of exercise is sitting on the sofa, lifting soda cans and potato chips to his mouth while watching other people exercise on TV. I’m not that bad, but I’ve decided Joey and I are going to change.
According to a report I have read, we should get 30 minutes of moderate physical activity every day to be healthy. It can help us live longer.
(Adapted from a text by Kiki Jones)
According to the text, we can conclude that a couch potato is a person who
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O coeficiente de dilatação linear ( !$ \alpha !$) é uma constante característica do material. Na tabela a seguir mostra-se o valor de !$ \alpha !$ de duas substâncias.
| Substância | Coeficiente de dilatação linear (ºC-1) |
| Alumínio | 24 . 10-6 |
| Aço | 12 . 10-6 |
Considere duas barras separadas, sendo uma de aço e outra de alumínio, ambas medindo 0,5 m a 0 ºC. Aquecendo as barras ao mesmo tempo, até que temperatura, em ºC, essas devem ser submetidas para que a diferença de comprimento entre elas seja exatamente de 6.10 -3 cm?
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Em um circuito elétrico, composto de cinco lâmpadas, iguais, após a queima de uma das lâmpadas, vários fatos se sucedem:
I- uma outra lâmpada apaga,
II- uma outra lâmpada permanece acesa com o mesmo brilho,
III- uma outra lâmpada permanece acesa porém diminui o seu brilho,
IV- uma outra lâmpada permanece acesa porém aumenta o seu brilho,
Assinale a alternativa que contém o único circuito no qual essa seqüência de fatos pode ocorrer.
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Num triângulo ABC, o ponto médio do lado !$ \overline{AB} !$ é M(4,3).
Se as coordenadas de B são ambas iguais a 2, então as coordenadas de A são
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I just looked in the mirror, and I saw an overweight woman looking back at me. Who is she? Is that really me? I am sad to say I am one of the many Americans who does not do enough physical activity.
We are gaining weight and in danger of having health problems.
We also eat too many high-calorie foods.
I’m not a “couch potato”, but my friend Joey is. His idea of exercise is sitting on the sofa, lifting soda cans and potato chips to his mouth while watching other people exercise on TV. I’m not that bad, but I’ve decided Joey and I are going to change.
According to a report I have read, we should get 30 minutes of moderate physical activity every day to be healthy. It can help us live longer.
(Adapted from a text by Kiki Jones)
“also”, is closest in meaning to
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