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If a gymnast, sitting on a rotating stool, with his arms outstretched, suddenly lowers his arms (a) The angular velocity decreases (b) His moment of inertia decreases (c) The angular velocity remains constant (d) The angular momentum increases

If a gymnast, sitting on a rotating stool, with his arms outstretched, suddenly lowers his arms
(a) The angular velocity decreases
(b) His moment of inertia decreases
(c) The angular velocity remains constant
(d) The angular momentum increases

Grade:Upto college level

2 Answers

Pallavi
15 Points
one year ago
His moment of inertia decreases as the radius decreases and moment of inertia is directly proportional to the square of distance from the centre of mass 
Vikas TU
14149 Points
one year ago
Dear student 
When the gymnast lower his arms, the distribution of mass changes about the axis of rotation. The mass comes more near to the axis and thus the moment of inertia of rotating system is reduced.
Good luck 
Cheers 

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