MHT CET · Physics · Rotational Motion
A disc of radius \(R\) and thickness \(\frac{R}{6}\) has a moment of inertia \(I\) about an axis passing through its centre and perpendicular to its plane. The disc is melted and recast into a solid sphere. The moment of inertia of a sphere about its diameter is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(A)
Step-by-step Solution
Detailed explanation
Volume of disc is A.d
Moment of inertia of disc is
When the disk is remolded in solid sphere of volume V having radius r, then
Moment of inertia of sphere is given by
Moment of inertia of disc is
When the disk is remolded in solid sphere of volume V having radius r, then
Moment of inertia of sphere is given by
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