A) decrease
B) increase
C) be halved
D) not change
Correct Answer: B
Solution :
When no external force acts on a body its angular moment remains conserved. From law of conservation of angular momentum, we have \[J=I\omega =\]constant where\[I\]is moment of inertia of the body and\[\omega \] is angular velocity. Also\[I=\frac{1}{2}M{{R}^{2}}\](for disc) where\[M\]is mass and\[R\]is radius of disc. \[J=\frac{1}{2}M{{R}^{2}}\omega =\]constant Since, man moves towards the centre of the disc, distance of mass distribution\[R\]decreases hence,\[\omega \] increases.You need to login to perform this action.
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