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A circular disc of radius R is removed from a bigger circular disc of radius 2R such that their circumferences coincide. The centre of mass of the new disc is at a distance of αR from the centre of the bigger disc. The value of α is

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A circular disc of radius R is removed from a bigger circular disc of radius 2R such that their circumferences coincide. The centre of mass of the new disc is at a distance of αR from the centre of the bigger disc. The value of α is



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