Compare the moment of inertia of a disk of mass 2m and radius r about its central axis to the moment of inertia of a sphere of mass m and radius 2r.

Explanation:

As we know that the moment of inertia of the disc is given as

here we know that

Now for sphere the moment of inertia is given as

here we know that

now the ratio of two moment of inertia is

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