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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. Let C_(1) denote the centre of mass of the section ABC and C_(2) denote the centre of mass of the section ADC. The distance C_(1)C_(2) is equal to |
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Answer» `R` |
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