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In a ring ABCD of radius r, the lower half ABC has mass m and the upper half ADC has mass 2m. In both parts, the masses are distributed evenly. The ring is initially at rest on a horizontal surface, as shown. O is the centre of the ring.The ring is now pushed very slightly and begins to roll on the horizontal surface without slipping. When it has made half a rotation, i.e., B is vertically above D, its angular velocity ω will be given by (where β = g/πr)(a) ω2 = 3β/2 (b) ω2 = 4β/3 (c) ω2 = 8β/5 (d) ω2 = 9β/4 |
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Answer» Correct Answer is: (c) ω2 = 8β/5 |
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