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

A disc is rotating with angular speed $\omega$. If a child sits on it, what is conserved?
  1. Linear momentum
  2. Angular momentum
  3. Kinetic energy
  4. 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.

Asked in: NEET 2002

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