A child is standing with folded hands at the centre of a platform rotating about its central axis. The kinetic energy of the system is K. Now, the child stretches his arms so that moment of inertia of the system doubled. Now, the kinetic energy of the system is
A
$\frac{K}{4}$
B
$\frac{K}{2}$
C
2 K
D
4 K

Question

A child is standing with folded hands at the centre of a platform rotating about its central axis. The kinetic energy of the system is K. Now, the child stretches his arms so that moment of inertia of the system doubled. Now, the kinetic energy of the system is

A

$\frac{K}{4}$

B

$\frac{K}{2}$

C

2 K

D

4 K

Accepted Answer

$ \frac{K}{2} $

Answer

$ \frac{K}{4} $

Answer

2 K

Answer

4 K

STANDARD Physics Conservation of Angular Momentum MCQ Question

Correct Answer

Detailed Explanation

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