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Work, Energy and Power
A body of mass m is revolving in circular orbit with constant speed. What is the work done on the body to revolve it?
Centripetal force, which acts along the radius and directed towards the centre is required to keep the body in circular orbit and to revolve with constant speed.
Instantaneous displacement of particle is always perpendicular to force.
Hence work required to revolve the body is zero.
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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?
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