Question

The ratio of radii of gyration of a circular ring and a circular disc, of the same mass and radius, about an axis passing through their centres and perpendicular to their planes are(a) √2 : 1(b) 1 : √2(c) 3 : 2(d) 2 : 1

Answer 1

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Answer 2

Explanation:

interest of ring M R square is equal to M K square M and M gets cancelled that 4K is equal to a radius of gyration is K M R square by 2 is equal to m square therefore K is equal to R by root 2 then ratio is equal to root 2 is to 1