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  4. A person sitting firmly over a rotating stool has his arms stretched. If he folds his arms, his angular momentum about the axis of rotation

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Q. A person sitting firmly over a rotating stool has his arms stretched. If he folds his arms, his angular momentum about the axis of rotation

COMEDKCOMEDK 2015System of Particles and Rotational Motion

Solution:

A person sitting firmly over a rotating stool has his arms stretched and as he folds his arms, centre of mass remain unchanged and therefore, angular momentum about the axis of rotation remain unchanged.