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A ring of radius r is first rotated with an angular velocity of w0 and then carefully placed on a rough horizontal surface. The coefficient of friction between the surface and the ring is μ , then the time after which its angular speed becomes 2/3is

(a) \(\frac{\omega_0r}{3μg}\)

(b) \(\frac{\omega_0r}{2μg}\)

(c) \(\frac{3\omega_0r}{2μg}\)

(d) \(\frac{\omega_0r}{μg}\) 

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1 Answer

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by (31.5k points)

Answer is (a) \(\frac{\omega_0r}{3μg}\)

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