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in Physics by (53.9k points)

A disc of metal is melted and recast in the form of solid sphere. What will happen to the moment of inertia about a vertical axis passing through the centre?

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Moment of inertia will decrease, because Id = 1/2 m r2 and Is =2/5 m r2, the  radius of sphere formed on recasting the disc will also decrease.

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