Q102 / 200 · NEET 2002 · Physics

A disc is rotating with angular speed $\omega$. If a child sits on it, what is conserved?

A
Linear momentum
Correct answer
B
Angular momentum
C
Kinetic energy
D
Potential energy

Solution

$\tau=\frac{d L}{d t}$, so $=0 \Rightarrow L=\frac{d L}{d l}$ constant Law of conservation of angular momentum.

Hence, the correct answer is option: 'B'.

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