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Q.

A particle of mass m is moving in a circular path of constant radius r such that its centripetal  acceleration ac is varying with time to as  ac= k2rt2  where k is a  constant. What is the power  delivered to the particle by the forces acting

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a

m k2r2t

b

mk2r2t4

c

mk2r2t6

d

mk2r2t8

answer is A.

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Detailed Solution

a =t2r k2v2r=k2rt2 v =krt tangential acceleration =at=kr power =  m at v=mkr krt= mk2r2t power for the centipetal force is zero
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