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Q.

The ratio of the radii of gyration of a hollow sphere and a solid sphere of the same radii about a tangential axis is

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a

215

b

259

c

521

d

73

answer is B.

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Detailed Solution

For hollow sphere,  KH=Im=23mR2+mR2m=53R

For solid sphere,  KS=Im=25mR2+mR2m=75R

∴  KHKS=2521=521

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