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

a)

b)

c)

d)


Question ID - 100106 | Top Ranker Answer | SaraNextGen

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

a)

b)

c)

d)

1 Answer - 5876 Votes

3537

Answer Key : (d) -

(d)

Taking  about CM



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