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Rotational Motion question

2002 · Q160
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Rotational Motion question

2002 · Q160

NEETPhysicsRotational MotionMCQ+4 / −1
A disc is rotating with angular speed ω\omegaω. If a child sits on it, what is conserved
  1. A
    linear momentum
  2. B
    angular momentum
  3. C
    kinetic energy
  4. D
    potential energy.
View written solutionFree

Correct answer: B

If external torque is zero, angular momentum remains conserved.
[External torque is zero because the weight of child acts downward]

L = Iω\omega ω = constant

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