Home Physics System of Particles Rotational Motion Angular Momentum If a gymnast, sitting on a rotating stool wi…
Physics System of Particles Rotational Motion Angular Momentum MCQ (Single Correct)

If a gymnast, sitting on a rotating stool with his arms outstretched, suddenly pulls his hands inwards

A
The angular velocity decreases
B
His moment of inertia decreases
C
The angular velocity stays constant
D
The angular momentum increases

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The correct answer is:
B

As the gymnast pulls his hands inwards, the radius of gyration decreases and hence moment

of inertia decreases.

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