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Q.

A particle is moving on a circular path of radius 1m. It starts from rest, its tangential acceleration is 3t. The time after which the acceleration of the particle makes an angle of 300 with centripetal acceleration is (n)2/3s. Find the value of n.

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answer is 2.

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Detailed Solution

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acos300=at and a sin 300=at      tan300=atat=3tat         at=3t  orv21=3t    v2=3t

But  at=dvdt=3t  or   0vdv=30ttdt   or v = 32t2
 34t4=3t  ort3=4
Given 
t=22/3sn=2

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