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Question

The moment of inertia of a solid cylinder about its own axis is the same as its moment of inertia about an axis passing through its centre of gravity and perpendicular to its length. The relation between its length L and radius R is

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Solution

L2=3R2

as MI of a solid cylinder about its own axis is 12 MR2

and MI about an axis passing through its center of gravity and perpendicular

M(L212+R24)

12MR2=M(L212+R24)

R22=L212+R24

R22R24=L212

L2=3R2

L12=312R

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