A) Decrease
B) Increase
C) Be halved
D) Not change
Correct Answer: B
Solution :
Key Idea: When no external force acts on a body its angular momentum remains conserved. From law of conservation of angular momentum, we have \[J=I\,\omega \,=\text{constant}\] 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. \[\therefore \] \[J=\frac{1}{2}M{{R}^{2}}\,\omega =\text{constant}\] Since, man moves towards the center of the disc, distance of mass distribution \[R\] decreases hence, so \[\omega \] increases.You need to login to perform this action.
You will be redirected in
3 sec