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A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.

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+1 vote
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asked Oct 17, 2017 in Physics by jisu zahaan (28,760 points) ● 26 ● 374 ● 807

A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.

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+1 vote
answered Oct 17, 2017 by sforrest072 (157,439 points) ● 60 ● 409 ● 933
selected Feb 16, 2018 by sanjeev
 
Best answer

The person holding a bundle of hay get tired because his muscular energy is converting into thermal energy. There is no displacement at all, so he had no work. 

As Work done = Force × displacement

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