A body of mass 100 gm moves with a constant | vedclass

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(D) Work done is defined as $W = \vec{F} \cdot \vec{s} = F s \cos 	heta$,where $	heta$ is the angle between the force $\vec{F}$ and the displacement

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Zero

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(D) Work done is defined as $W = \vec{F} \cdot \vec{s} = F s \cos 	heta$,where $	heta$ is the angle between the force $\vec{F}$ and the displacement $\vec{s}$.In uniform circular motion,the centripetal force acts towards the center of the circle (radially inward).The displacement vector for an object moving along a circular path is always directed along the tangent to the circle at that point.Since the radius (and thus the force) is always perpendicular to the tangent (displacement),the angle $	heta = 90^{\circ}$ at every point on the path.Therefore,the work done $W = F s \cos(90^{\circ}) = F s (0) = 0$.For one complete revolution,the total work done is the sum of work done at each infinitesimal point,which results in zero.

$A$ body of mass $100 \ gm$ moves with a constant speed along a circular path of radius $r$. What is the work done during one complete revolution?

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