Foram encontradas 80 questões.
O bloco da Figura 1 entra em movimento sob ação de uma força resultante de módulo F que pode atuar de três formas diferentes, conforme os diagramas da Figura 2.
Com relação aos módulos das velocidades !$ v_1 !$, !$ v_2 !$ e !$ v_3 !$ atingidas pelo bloco no instante !$ t = 2 \,s !$, nas três situações descritas, pode-se afirmar que
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Nick, a British tourist, is telling his American girlfriend about the questions he was asked at Kennedy Airport, New York. 'To start with the immigration officer asked me where I was from and why I'd come to the 05 States. That wasn't a problem. But then she wanted to know how much money I had. When I told her, she said $800 wasn't enough for three weeks. She wondered why I hadn't brought more. She then asked me if I intended to work. She wanted to know if I really planned to go 10 ba ck to theUK afterthreeweeks.'
English Grammar in Steps - Richmond
The word 'enough' can be replaced in the text above by
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Um recipiente tem capacidade de 3.000 cm3 a 20 °C e está completamente cheio de um determinado líquido. Ao aquecer o conjunto até 120 °C, transbordam 27 cm3. O coeficiente de dilatação aparente desse líquido, em relação ao material de que é feito o recipiente é, em °C–1, igual a
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Considere o esboço dos gráficos das funções reais f, g e h, tais que f é do 2º grau e g e h são do 1º grau.
Sabe-se que V é o vértice da parábola.
O conjunto de todos os valores de x para os quais !$ h(x)> g(x)>f(x) !$ é
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Nick, a British tourist, is telling his American girlfriend about the questions he was asked at Kennedy Airport, New York. 'To start with the immigration officer asked me where I was from and why I'd come to the 05 States. That wasn't a problem. But then she wanted to know how much money I had. When I told her, she said $800 wasn't enough for three weeks. She wondered why I hadn't brought more. She then asked me if I intended to work. She wanted to know if I really planned to go 10 ba ck to theUK afterthreeweeks.'
English Grammar in Steps - Richmond
The contraction 'd means
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Read the text below to answer question.
Spectacular Northern Lights linked to suicidal depression
Alaska's tragically high number of suicide may be related to cosmic storms and the Northern Lights (aurora borealis), according to an expert in the study of brainwaves.
Depression in the Far North has in general been attributed to the deep, dark and long winters. But Dr Anita Bush ,who specialises in electroencephalography, has complicated matters by discovering a link between solar flames and brainwave activity in two sets of Alaskans she has studied for the past five years.
The microscopic electric impulses were concentrated in an area of the brain known also to cause seasonal affective depression (SAD), the condition up to now blamed for dozens of suicides each year in the remote Alaskan coast. Suicide levels among the state's 15 to 24-year-olds have risen sharply in recent years, to six times the national average, says Dr Bush.
She has not yet demonstrated a link between increased brainwaves and suicidal tendencies but she thinks existing data on supposed SAD cases may in fact include cases of suicide induced by geomagnetism. For now she has suggested that special dark glasses, worn against solar flames and the Northern Lights, might elevate morale among the suicidal.
Some of her sceptical colleagues as Professor Tom Hallinan, one of a team studying the aurora, recently insisted that the most serious health risk in watching 30 the Alaskan night sky was a cricked neck.
Adapted from Advance Your English - Cambridge University Press
Considering the Reported Speech, Dr. Bush said that
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All light on the night
Our cities and towns are far from silent at night. As most of us are going to bed, a lot of workers are just going to their jobs. It is estimated that up to a fifth of the working population carries out its duties at night - running hospitals and maintaining power stations, for example.
There is one problem: They have the same biological clock as day workers. Night workers often have trouble sleeping through the day, and sometimes find it harder to stay awake, which means mistakes are more likely to happen. Dr Lawrence Smith, a psychologist, discovered that among people who do the same job, night workers suffered 20% more injuries than day workers.
He is now testing the theory that the light can be used to fool the human body clock.The body clock appears to be influenced by light, because one chemical at its disposal is sensitive to light.
Adapted from Advance your English
The Passive Voice of the sentence 'He is now testing the theory...' is
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That's my job
This is a story about four people: Everybody, Somebody, Anybody, and Nobody. There was an important job to be done and Everybody was sure that Somebody would do it. Anybody could have done it, but Nobody did. Somebody got angry about that because it was Everybody's job. Everybody thought Anybody could do it, but Nobody realized that Everybody wouldn't do it. It ended up that Everybody blamed Somebody when Nobody did what Anybody could have done.
Unknown author- KEYS, Ed. Saraiva
According to the text above you've just read, who in fact, performed the job was
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Uma esfera de massa m, eletrizada positivamente com carga q, está fixada na extremidade de um fio ideal e isolante de comprimento !$ \ell !$. O pêndulo, assim constituído, está imerso em uma região onde além do campo gravitacional !$ \vec{g} !$ atua um campo elétrico horizontal e uniforme !$ \vec{E} !$. Este pêndulo é abandonado do ponto A e faz um ângulo !$ θ !$ com a vertical conforme mostra a figura.
Desprezando-se quaisquer resistências, ao passar pelo ponto B, simétrico de A em relação à vertical, sua energia cinética vale
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No diagrama a seguir, do volume (V) em função da temperatura absoluta (T), estão indicadas as transformações AB e BC sofridas por uma determinada massa de gás ideal.
Num diagrama da pressão (P) em função do volume (V), essas transformações deveriam ser indicadas por
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Cadernos
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