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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 - 2
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  2. A child is standing with folded hands at the centre of a platform rota...

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  3. A ballet dancer spins about a vertical axis at 60 rpm with his arms cl...

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  4. A circular disc is rotating about its natural axis with angular veloci...

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  5. A constant torque acting on a uniform circular wheel changes its angul...

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  6. Density remaining constant, if earth contracts to half of its present ...

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  7. Two wheels of M.I. 3 kg m^(2) and 5 kg m^(2) are rotating at the rate ...

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  8. A mass is whirled in a circular path with an angular momentum L. If th...

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  9. A disc of mass 100 g and radius 10 cm has a projection on its circumfe...

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  10. A Merr-go-raound, made of a ring - like platform of radius R and mass ...

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  11. The diameter of a rotating fly wheel is R. Its coefficient of linear e...

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  12. Keeping the mass of earth as constant, if its radius is reduced to 1//...

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  13. A uniform circular disc of radius 50 cm at rest is free to turn about ...

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  14. A particle of mass m is projected with an initial velocity u at an ang...

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  15. The handle of a door is at a distance 40 cm from axis of rotation. If ...

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  16. A constant torque of 1000 Nm turns a wheel of M.I 200 kg m^(2) about a...

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

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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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  20. A thin uniform rod of length l and mass m is swinging freely about a h...

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