15071453
Descripción
Test por Jeffrey Piggott, actualizado hace más de 1 año
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Creado por Jeffrey Piggott
hace más de 6 años
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Pregunta 1
Pregunta
A box of mass 8.0 kg rests on a horizontal rough surface. A string attached to the box passes over a smooth pulley and supports a 2.0 kg mass at its other end.
When the box is released, a frictional force of 6.0 N acts on it.
What is the acceleration of the box?
Respuesta
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A 1.4 m s^–2
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B 1.7 m s^–2
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C 2.0 m s^–2
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2.6 m s^–2
Pregunta 2
Pregunta
What is the definition of the force on a body?
Respuesta
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A the mass of the body multiplied by its acceleration.
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B the power input to the body divided by its velocity.
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C the rate of change of momentum of the body.
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D the work done on the body divided by its displacement .
Pregunta 3
Pregunta
Newton’s third law of motion is often summarised as ‘Every action (force) has an equal and opposite reaction.’
A book rests on a table.
If the weight of the book is the ‘action’ force, what is the ‘reaction’ force?
Respuesta
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A the pull of the book on the Earth
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B the pull of the Earth on the book
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C the push of the book on the table
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D the push of the table on the book
Pregunta 4
Pregunta
A 0.10 kg mass is taken to Mars and then weighed on a spring balance and on a lever balance.
The acceleration due to gravity on Mars is 38% of its value on Earth.
What are the readings on the two balances on Mars? (Assume that on Earth g = 10 m s^–2.)
Image:
Q4 (binary/octet-stream)
Respuesta
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A
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B
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C
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D
Pregunta 5
Pregunta
Water is pumped through a hose-pipe at a rate of 90 kg per minute. It emerges from the hose-pipe horizontally with a speed of 20 m s^–1.
Which force is required from a person holding the hose-pipe to prevent it moving backwards?
Respuesta
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A 30 N
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B 270 N
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C 1800 N
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D 10 800 N
Pregunta 6
Pregunta
A man weighs 240 N on Mars where the acceleration of free fall g is 4 m.s^–2. On the Moon, g is 2.0 m.s^-2.
Which statement is correct?
Respuesta
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A The man has a mass on Mars of 60 N.
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B The man has a mass on the Moon of 120 kg.
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C The man weighs 120 N on the Moon.
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D The man weighs 240 N on the Moon.
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