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A ballet dancer spins about vertical axi...

A ballet dancer spins about vertical axis at `1.5pi rad//s` with arms outstreched. With the arms folded, the moment on inertia about the same axis of rotation changes by 25%. The new frequency of roatation of is

A

100 rpm

B

60rpm

C

150 rpm

D

120 rpm

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The correct Answer is:
B
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