A body of mass 100 , g is rotating in a circu | vedclass

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(D) The work done by a force is given by the formula $W = \vec{F} \cdot \vec{d} = F d \cos 	heta$,where $	heta$ is the angle between the force and t

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Zero

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(D) The work done by a force is given by the formula $W = \vec{F} \cdot \vec{d} = F d \cos 	heta$,where $	heta$ is the angle between the force and the displacement.In uniform circular motion,the centripetal force acts towards the center of the circle,while the instantaneous displacement is along the tangent to the circular path.Since the radius vector is always perpendicular to the tangent,the angle between the centripetal force and the displacement is always $90^\circ$.Therefore,the work done in any small displacement is $dW = F \cdot ds \cdot \cos(90^\circ) = 0$.Consequently,the total work done in one complete revolution is $0 \, J$.

$A$ body of mass $100 \, g$ is rotating in a circular path of radius $r$ with constant velocity. The work done in one complete revolution is

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