A uniform ring is rotating about the vertical axis with angular velocity ω initially. A point insect ( S ) having the same mass as that of the ring starts walking from the lowest point P 1 and finally reaches the point P 2 (as shown in the

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A uniform ring is rotating about the vertical axis with angular velocity ω initially. A point insect ( S ) having the same mass as that of the ring starts walking from the lowest point P 1 and finally reaches the point P 2 (as shown in the figure). The final angular velocity of the ring is

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Correct answer: D. ω / 3

From the conservation of angular momentum 1 2 M R 2 &#969; = 1 2 MR 2 + MR 2 &#969; &#180; &#8658; 1 2 MR 2 &#969; = 3 2 MR 2 &#969; &#180; &#8658; &#969; &#180; = &#969; 3

A uniform ring is rotating about the vertical axis with angular velocity ω initially. A point insect ( S ) having the same mass as that of the ring starts walking from the lowest point P 1 and finally reaches the point P 2 (as shown in the figure). The final angular velocity of the ring is

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