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Q.

The work done by centripetal force when a body moves in a circular motion is:

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a

positive

b

negative

c

zero

d

depends on the direction of force

answer is C.

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Detailed Solution

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Centripetal force is the force that causes a body to move in a circular motion.

This force is always directed towards the center.

The centripetal force acting on a body of mass 'm' rotating radius 'r' is as follows:

F=mv2r

Work done: It is the dot product of Force and Displacement.

Work Done(W)= Forced (F)× Displacement (S)×cosθ

Here θ is the angle between force and displacement.

When a body moves in a circular path, the direction of centripetal force is always towards the center, and the direction of displacement is always perpendicular to the centripetal direction.


 


 

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