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प्रश्न
What is the work done by the gravitational force on the moon that revolves around the earth?
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उत्तर
The moon is revolving around the earth. In this process, the work done by the gravitational force is zero because the displacement of the moon is at the right angle to the gravitational force.
संबंधित प्रश्न
If the power of a motor is 100 kW, at what speed can it raise a load of 50,000 N?
How is the unit horsepower related to the S.I. unit of power?
When a body moves in a circular path, how much work is done by the body? Give reason.
(Hint: The body is acted upon by the centripetal force.)
A coolie X Carrying a load on his head climbs up a slope and another coolie Y carrying the identical load on his head move the same distance on a frictionless horizontal platform. Who does more work? Explain the reason.
Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.
State two factors on which power spent by a source depends. Explain your answer with examples.
What do you mean by a centrifugal force?
A man raises a box of mass 50 kg to a height of 2 m in 20s, while another man raises the same box to the same height in 50s. Calculated:
- the work done, and
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What do you understand by work? Is work a scalar or a vector quantity?
