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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A man is rowing upstream and is at rest w.r.t. shore. Is he doing work w.r.t. shore?
The man is doing zero work because he is at rest w.r.t. shore. Hence, displacement is zero.