By eating two apples, a person starts pushing the wall of room. If food value of apple is 100 calories per apple, how much work he will do in pushing the wall in one hour?
Zero, because the displacement of the wall will be zero.
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What is the dimensional formula of power?
[M1L2T–3] is the dimensional formula of power.
Power =
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Is frictional force conservative?
Friction is a non-conservation force because work done by friction over closed path is not equal to zero.