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Q.

On pushing a mighty stone, a child is unable to move it. If the work done is zero, is it true that he expends no energy?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is False.
The work done is zero as there is no displacement of the stone, but the energy is expended by the child that causes the muscular contraction in him. This energy can be seen in the form of heat or sweating.
The correct statement would be energy that the boy exerts on the stone is dissipated in the form of heat, due to which he sweats and feels tired.
 
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