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Q.

If you spin a coin around a vertical diameter on a table, it will slowly lose energy and begin a wobbling motion. The angle between the coin and the table will gradually decrease, and eventually it will come to rest. Assume that this process is slow, and consider the motion when the coin makes an angle θ   with the table. You may assume that the CM is essentially motionless. Let R be the radius of the coin, and let Ω  be the frequency at which the contact point on the table traces out its circle. Assume that the coin rolls without slipping.

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Find  Ω  if (g=10 m/sec2 , R = 5m and  θ=300)

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answer is 4.

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Detailed Solution

dLdt=ΩL=ΩmR24(Ωsinθ)cosθ

τ=mgRcosθ Ω=2gRsinθ 

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