Q.

A ring of radius R is first rotated with an angular velocity ω0 and then carefully placed on a rough horizontal surface. The coefficient of friction between the surface and the ring is µ. Time after which its angular speed is reduced to half is

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a

b

c

d

answer is D.

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Detailed Solution

IC = MR2, fk = µMg
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A ring of radius R is first rotated with an angular velocity ω0 and then carefully placed on a rough horizontal surface. The coefficient of friction between the surface and the ring is µ. Time after which its angular speed is reduced to half is