9650065
Descrição
Quiz por Anibal Santamaria, atualizado more than 1 year ago
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Criado por Anibal Santamaria
mais de 7 anos atrás
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Questão 1
Questão
An object of mass 2 kg has a linear momentum of magnitude 6 kg·m/s. What is this object's kinetic energy?
Responda
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3 J
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6 J
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9 J
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12 J
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18 J
Questão 2
Questão
The graph shows the force on an object over time. If the object has a mass of 8 kg and is moving in a straight line, what is its change in speed?
Responda
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16 m/s
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14 m/s
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12 m/s
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10 m/s
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8 m/s
Questão 3
Questão
A box with a mass of 2 kg accelerates in a straight line from 4 m/s to 8 m/s due to the application of a force whose duration is 0.5 s. Find the average strength of this force.
Responda
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2 N
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4 N
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8 N
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12 N
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16 N
Questão 4
Questão
A ball of mass m traveling horizontally with velocity v strikes a massive vertical wall and rebounds back along its original direction with no change in speed. What is the magnitude of the impulse delivered by the wall to the ball?
Responda
Questão 5
Questão
Two objects, one of mass 3 kg and moving with a speed of 2 m/s and the other of mass 5 kg and speed 2 m/s, move toward each other and collide head-on. If the collision is perfectly inelastic, find the speed of the objects after the collision.
Responda
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0.25 m/s
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0.5 m/s
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0.75 m/s
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1 m/s
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2 m/s
Questão 6
Questão
A student is trying to balance a meter stick on its midpoint. Given that m_1 = 6 kg and m_2 = 2 kg, how far from the left edge should the student hag a third mass, m_3 = 10 kg, to balance the meter stick?
Responda
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40 cm
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50 cm
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60 cm
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70 cm
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80 cm
Questão 7
Questão
Two objects move toward each other, collide, ad separate. If there was no net external force acting on the objects, but some kinetic energy was lost, then
Responda
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the collision was elastic and total linear momentum was conserved
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the collision was elastic and total linear momentum was not conserved
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the collision was not elastic and total linear momentum was conserved
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the collision was not elastic and total linear momentum was not conserved
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None of these
Questão 8
Questão
Three thin, uniform rods each of length L are arranged in the shape of an inverted U, as shown in the figure. The two rods on the arms of the U each have mass m; the third rod has mass 2m. How far below the midpoint of the horizontal rod is the center of mass of this assembly?
Responda
Questão 9
Questão
A car of mass 1,000 kg collides head-on with a truck of mass 2,000 kg. Both vehicles are moving at a speed of 21 m/s, and the collision is perfectly inelastic. After the crash, the two vehicles skid to a halt. Assuming friction is the only force acting on the vehicles after the collision, how much work is done by friction after the crash?
Responda
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73,500 J
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-73,500 J
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147,000 J
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-147,000 J
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220,500 J
Questão 10
Questão
Which of the following best describes a perfectly inelastic collision free of external forces?
Responda
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Total linear momentum is never conserved.
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Total linear momentum is sometimes conserved.
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Kinetic energy is never conserved.
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Kinetic energy is sometimes conserved.
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Kinetic energy is always conserved.
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