a person holds a bundle of load over his head for 30 minutes and get tired has he done some work or not justify your answer
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no,he has not done any work there. holding a book doesn't require even any fraction of force to be applied.in this criteria we are not applying any force except keeping the book on his head. hence work done by the person is 0.
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No he has not done any work according to Physics because the force of gravity is acting perpendicular to the loads .
Since, the value of cos 90 is 0.
It implies that the net force is zero.So the work is zero.
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