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