32303007
Descrição
Quiz por Jeffrey Piggott, atualizado more than 1 year ago
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Criado por Jeffrey Piggott
mais de 3 anos atrás
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Questão 1
Questão
A long-distance runner wishes to calculate her average speed for a race.
Which calculation should she use?
Responda
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average speed = total distance / total time
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average speed = total distance × total time
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average speed = total time / total distance
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average speed = total distance + total time
Questão 2
Questão
A heavy metal ball falls vertically downwards through air past four equally spaced levels J, K, L and M.
Image:
Q2 (binary/octet-stream)
Responda
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speed is greatest between J and K: time is shortest between J and K
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speed is greatest between J and K: time is shortest between L and M
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speed is greatest between L and M; time is shortest between J and K
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speed is greatest between L and M; time is shortest between L and M
Questão 3
Questão
A ball is rolling down one hill and up another. Points A and B are at the same height on the two different hills . How do the velocity and acceleration change as the ball rolls from point A to point B?
Responda
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The velocity and acceleration are the same at both points.
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The velocity and the magnitude of the acceleration are the same at both points, but the direction of the acceleration is opposite at B to the direction it had at A.
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The horizontal component of the velocity is the same at points A and B, but the vertical component of the velocity has the same magnitude, but the opposite sign at B. The acceleration at points A and B are the same.
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The vertical component of the velocity is the same at points A and B, but the horizontal component of the velocity has the same magnitude, but the opposite sign at B. The acceleration at points A and B has the same magnitude, but opposite direction.
Questão 4
Questão
The graph shows how the acceleration of an object moving in a straight line varies with time.
Which graph shows the variation with time of the velocity of the object?
Image:
Q4 (binary/octet-stream)
Responda
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AImage:Q4 A (binary/octet-stream)
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BImage:Q4 B (binary/octet-stream)
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CImage:Q4 C (binary/octet-stream)
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DImage:Q4 D (binary/octet-stream)
Questão 5
Questão
A ball is released from rest at time zero. After 1.0 s it bounces inelastically from a horizontal
surface and rebounds, reaching the top of its first bounce after 1.5s.
What is the total displacement of the ball from its original position after 1.5s?
Image:
Q5 (binary/octet-stream)
Responda
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A 1.25 m
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B 3.75 m
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C 5.00 m
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D 6.25 m
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