A) is not changed
B) be halved
C) decreases
D) increases
Correct Answer: D
Solution :
If M is mass of disc, R is radius then moment of inertia is \[I={{\frac{1}{2}}^{2}}MR\] From law of conservation of angular momentum \[J=I\omega =\text{cosnstant}\] where, \[\omega \]is angular velocity. Hence, if\[I\]decreases \[\omega \]increases and vice versa. \[J=\frac{1}{2}M{{R}^{2}}\omega =\operatorname{constant}\] When man standing at the edge of the disc walks towards its centre, R decreases, hence angular velocity increases.You need to login to perform this action.
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