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A ballet dancer spins about a vertical a...

A ballet dancer spins about a vertical axis at 60 rpm with his arms closed. Now he stretches his arms such that M.I increases by 50%. The new speed of revolution is

A

`80` rpm

B

`40` rpm

C

`90` rpm

D

`30` rpm

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-SYSTEM OF PARTICLES AND ROTATIONAL MOTION-Exercise-II
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  9. If a disc of mass m and radius R totates with an angular acceleration ...

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  10. A merry-go-round, made of a ring-like platform of radius R and mass M ...

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  16. A constant torque of 1000 N-m, turns á wheel of moment of inertia 200 ...

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  17. If 484J of energy is spent in increasing the speed of wheel from 60 rp...

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  18. A shaft rotating at 3000 rpm is transmitting a power of 3.14 KW. The m...

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  19. A wheel rotating at angular speed of 20rads^(-1), is brought to rest b...

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