Physics-
General
Easy

Question

A circular disc of radius R and thickness R/6 has moment of inertia  about an axis passing through its center and perpendicular to its plane. It is melted and re casted in to a solid sphere. The moment of inertia of the sphere about its diameter as axis of rotation is.

  1. 1
  2. 21 over 8
  3. 1 fifth
  4. 1 over 10

The correct answer is: 1 fifth

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