Statement I : A girl sits on a rolling chair, when she stretch her arms horizontally, her speed is reducedStatement II : Principle of conservation of angular momentum is applicable in this situation.

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If both statement I and statement II are true and statement II is the correct explanation of statement I.

If both statement I and statement II are true but statement II is not the correct explanation of statement I.

If statement I is true but statement II is false

If both statement I and statement II are false

answer is A.

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Detailed Solution

If friction in the rotational mechanism is neglected, there is no external torque about the axis of rotation of the chair and hence Iω is constant, where I is moment of inertia and ω is angular velocity. Stretching the arms increases I about the rotation, results in decreasing the angular speed ω. Bringing the arms closer, body has the opposite effect.

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