The ratio of radius of gyration of a solid sphere of mass M and radius R about its own axis to the radius of gyration of the thin hollow sphere of same mass and radius about its axis is:
Answer & explanation
Correct answer: option 2
$\text{Radius of gyration of solid sphere about its own axis is } = \sqrt{\frac{2}{5}}R$
$\text{Radius of gyration of hollow sphere about its own axis is } = \sqrt{\frac{2}{3}}R$
$\text{Required Ratio is } \sqrt{\frac{2}{5}} \sqrt{\frac{3}{2}} = \sqrt{\frac{3}{5}}$
All the options are wrong