Foram encontradas 40 questões.
Um circuito construído com elementos ideais possibilita a conexão de um resistor entre os pontos X e Y.
Deseja-se que a intensidade da corrente elétrica que passa pelo resistor de 20 Ω seja de 2 A. Para que isso ocorra, entre os pontos X e Y deve ser conectado um resistor de
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Dois feixes de luz, A e B, de frequências iguais a fA = 4f e fB = 6f, cruzam-se em determinado ponto do espaço, seguindo seus caminhos originais após o cruzamento. De acordo com os princípios da óptica, as frequências dos feixes A e B, após o cruzamento são, respectivamente,
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Um reservatório de água sem tampa apresentou uma trinca em seu fundo de tal forma que, para repará-lo, teve de ser esvaziado. Quando o reservatório foi novamente preenchido com água, observou-se que o tempo para o endurecimento do reparo não tinha sido suficiente, pois, assim que o nível de água atingiu 2 m em relação ao fundo, o reparo foi desfeito e a água começou a vazar. Sendo a pressão atmosférica igual a 1 × 105 Pa, a aceleração da gravidade igual a 10 m/s2 e a densidade da água igual a 1 × 103 kg/m3, a pressão a partir da qual a água começou a vazar foi de
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No interior de uma garrafa PET foram colocados pequenos pedaços de gelo seco. Em seguida, uma rolha foi inserida no gargalo, tampando a garrafa, que foi deixada em repouso sobre uma superfície plana e horizontal, livre de atritos e exposta ao sol, até todo o gelo seco sublimar.
Finalizada a sublimação, devido ao aumento da pressão interna da garrafa, a rolha foi arremessada com velocidade de 8 m/s e, ao mesmo tempo, a garrafa movimentou-se no sentido contrário ao da rolha. Desprezando quaisquer tipos de atrito e sabendo que a massa da garrafa corresponde a 16 vezes a massa da rolha, o módulo da velocidade com que a garrafa movimentou-se foi de
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Considere uma caixa em repouso no centro do tampo horizontal de uma mesa. A permanência do repouso justifica-se porque
Provas
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Heatwaves have a huge impact on our physical and mental health. Doctors usually fear them, as emergency rooms quickly fill up with patients suffering from dehydration, delirium and fainting. Recent studies suggest at least a 10% rise in hospital emergency room visits on days when temperatures reach or exceed the top 5% of the normal temperature range for a given location.
Soaring temperatures can also make symptoms worse in those with mental health conditions. Heatwaves — as well as other weather events such as floods and fires — have been linked to a rise in depressive symptoms in people with depression, and a rise in anxiety symptoms in those with generalised anxiety disorder — a disorder that makes people feel anxious most of the time.
A Boston University study found that those in rooms without air conditioning during a heatwave performed 13% worse than their peers in cognitive tests and had 13% slower reaction time. When people are not thinking clearly due to heat, it is more likely they will become frustrated, and this, in turn, can lead to aggression. There is strong evidence linking extreme heat with a rise in violent crime. Even just a one or two degrees Celsius increase in ambient temperatures can lead to a 3-5% spike in assaults.
(Laurence Wainwright e Eileen Neumann. https://theconversation.com, 12.07.2022. Adaptado.)
In the excerpt from the third paragraph “When people are not thinking clearly due to heat”, a expressão sublinhada pode ser substituída, sem alteração de sentido, por
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Heatwaves have a huge impact on our physical and mental health. Doctors usually fear them, as emergency rooms quickly fill up with patients suffering from dehydration, delirium and fainting. Recent studies suggest at least a 10% rise in hospital emergency room visits on days when temperatures reach or exceed the top 5% of the normal temperature range for a given location.
Soaring temperatures can also make symptoms worse in those with mental health conditions. Heatwaves — as well as other weather events such as floods and fires — have been linked to a rise in depressive symptoms in people with depression, and a rise in anxiety symptoms in those with generalised anxiety disorder — a disorder that makes people feel anxious most of the time.
A Boston University study found that those in rooms without air conditioning during a heatwave performed 13% worse than their peers in cognitive tests and had 13% slower reaction time. When people are not thinking clearly due to heat, it is more likely they will become frustrated, and this, in turn, can lead to aggression. There is strong evidence linking extreme heat with a rise in violent crime. Even just a one or two degrees Celsius increase in ambient temperatures can lead to a 3-5% spike in assaults.
(Laurence Wainwright e Eileen Neumann. https://theconversation.com, 12.07.2022. Adaptado.)
De acordo com o texto,
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Heatwaves have a huge impact on our physical and mental health. Doctors usually fear them, as emergency rooms quickly fill up with patients suffering from dehydration, delirium and fainting. Recent studies suggest at least a 10% rise in hospital emergency room visits on days when temperatures reach or exceed the top 5% of the normal temperature range for a given location.
Soaring temperatures can also make symptoms worse in those with mental health conditions. Heatwaves — as well as other weather events such as floods and fires — have been linked to a rise in depressive symptoms in people with depression, and a rise in anxiety symptoms in those with generalised anxiety disorder — a disorder that makes people feel anxious most of the time.
A Boston University study found that those in rooms without air conditioning during a heatwave performed 13% worse than their peers in cognitive tests and had 13% slower reaction time. When people are not thinking clearly due to heat, it is more likely they will become frustrated, and this, in turn, can lead to aggression. There is strong evidence linking extreme heat with a rise in violent crime. Even just a one or two degrees Celsius increase in ambient temperatures can lead to a 3-5% spike in assaults.
(Laurence Wainwright e Eileen Neumann. https://theconversation.com, 12.07.2022. Adaptado.)
No trecho do segundo parágrafo “and a rise in anxiety symptoms in those with generalised anxiety disorder — a disorder that makes people feel anxious most of the time”, o travessão introduz uma
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Heatwaves have a huge impact on our physical and mental health. Doctors usually fear them, as emergency rooms quickly fill up with patients suffering from dehydration, delirium and fainting. Recent studies suggest at least a 10% rise in hospital emergency room visits on days when temperatures reach or exceed the top 5% of the normal temperature range for a given location.
Soaring temperatures can also make symptoms worse in those with mental health conditions. Heatwaves — as well as other weather events such as floods and fires — have been linked to a rise in depressive symptoms in people with depression, and a rise in anxiety symptoms in those with generalised anxiety disorder — a disorder that makes people feel anxious most of the time.
A Boston University study found that those in rooms without air conditioning during a heatwave performed 13% worse than their peers in cognitive tests and had 13% slower reaction time. When people are not thinking clearly due to heat, it is more likely they will become frustrated, and this, in turn, can lead to aggression. There is strong evidence linking extreme heat with a rise in violent crime. Even just a one or two degrees Celsius increase in ambient temperatures can lead to a 3-5% spike in assaults.
(Laurence Wainwright e Eileen Neumann. https://theconversation.com, 12.07.2022. Adaptado.)
In the excerpt from the second paragraph “as well as other weather events such as floods and fires”, the underlined expression conveys the idea of
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Heatwaves have a huge impact on our physical and mental health. Doctors usually fear them, as emergency rooms quickly fill up with patients suffering from dehydration, delirium and fainting. Recent studies suggest at least a 10% rise in hospital emergency room visits on days when temperatures reach or exceed the top 5% of the normal temperature range for a given location.
Soaring temperatures can also make symptoms worse in those with mental health conditions. Heatwaves — as well as other weather events such as floods and fires — have been linked to a rise in depressive symptoms in people with depression, and a rise in anxiety symptoms in those with generalised anxiety disorder — a disorder that makes people feel anxious most of the time.
A Boston University study found that those in rooms without air conditioning during a heatwave performed 13% worse than their peers in cognitive tests and had 13% slower reaction time. When people are not thinking clearly due to heat, it is more likely they will become frustrated, and this, in turn, can lead to aggression. There is strong evidence linking extreme heat with a rise in violent crime. Even just a one or two degrees Celsius increase in ambient temperatures can lead to a 3-5% spike in assaults.
(Laurence Wainwright e Eileen Neumann. https://theconversation.com, 12.07.2022. Adaptado.)
The text
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