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  4. One circular ring and one circular disc, both are having the same mass and radius. Then both of their moments of inertia about the axes passing through their centres and perpendicular to their planes, will be in the ratio

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Q. One circular ring and one circular disc, both are having the same mass and radius. Then both of their moments of inertia about the axes passing through their centres and perpendicular to their planes, will be in the ratio

Rajasthan PETRajasthan PET 2010

Solution:

The ratio of moments of inertia
$ \frac{{{I}_{ring}}}{{{I}_{disc}}}=\frac{M{{R}^{2}}}{1/2M{{R}^{2}}}=2:1 $