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Grade: Upto college level
        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
6 years ago

Answers : (2)

Pallavi
15 Points
							
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 
6 months ago
Vikas TU
11140 Points
							
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 
2 months ago
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