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There are two spheres of same mass and r...

There are two spheres of same mass and radius. One is solid and the other is hollow. Which of them has a larger moment of inertia about a diameter ?

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The hollow sphere, because most of the mass is concentrated at a larger distance.
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The moment of inertia of two spheres of equal masses about their diameters ar equal. It one of them is solid and the other is hollow, What will be the ratio of radii ?

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