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A smooth semicircular wire track of radi...

A smooth semicircular wire track of radius R is fixed in a vertical plane . One end of a massless spring of natural lenth `(3//4)` R is attached to the lowest point O of the wire track. A small ring of mass m, which can slide on the track, is attached to the other end of the spring. the ring is held stationary of point P such that the spring makes an angle of `60^(@)` with the vertical. The spring constant `k=(mg//R)`. Consider the instant when the ring is released. Determine the tangential acceleration of the ring and the normal reaction between ring and track.

A

`(3mg)/(8)`

B

mg

C

`(mg)/(4)`

D

`(3mg)/(4)`

Text Solution

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The correct Answer is:
A
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