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A boy standing on a rotating table with ...

A boy standing on a rotating table with heavy spheres in his hands, suddenly brings his hands close to his body. The angular velocity of the table

A

Remains unchanged

B

Becomes zero

C

Decreases

D

Increases

Text Solution

Verified by Experts

The correct Answer is:
D
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A persons is spinning with his hands outstretched at th rate of 4 rad s^(-1) . When he brings his hands close to the body, he spins at the rate of 16 rad s^(-1) . The ratio of M.I. in the two cases susccessively is

A man stands on a rotating platform, with his arms stretched horizontally holding a 5 kg weight in each hand. The angular speed of the platform is 30 revolutions per minute. The man then brings his arms close to his body with the distance of each weight from the axis changing from 90cm to 20cm. The moment of inertia of the man together with the platform may be taken to be constant and equal to 7.6 kg m^(2) . (a) What is his new angular speed? (Neglect friction.) (b) Is kinetic energy conserved in the process? If not, from where does the change come about?

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AAKASH SERIES-SYSTEM OF PARTICLES AND ROTATIONAL MOTION-EXERCISE - 1A
  1. The principle used by a gymnast to increase the number of somersaults,...

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  2. If polar ice caps melt, the length of the day

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  3. A boy standing on a rotating table with heavy spheres in his hands, su...

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  4. When a stopper is pulled from a filled wash basin, the water drians ou...

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  5. A man turns on rotating table with an angular speed omega. He is holdi...

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  6. A solid sphere, solid cylinder and a disc are allowed to roll down fro...

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  7. Two identical hollow spheres roll down two inclined planes of same hei...

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  8. Let vec(A) be a unit vector along the axis of rotation of a purely rot...

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  9. A body is uniformly rotating about an axis fixed in an interial frame ...

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  10. A body is in pure rotation. The linear speed v of the particle, the di...

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  11. A body is rotating uniformaly about vertical axis fixed in an intertia...

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  12. A uniform rod of length l is kept vertically on a horizontal smooth at...

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  13. A circular disc A of radius r is made from an iron plate of thickness ...

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  14. Equal torques act on the disc A and B of the pervious problem, initial...

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  15. A closed cylindrical tube containing some water (not filling the entir...

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  16. Let I(1) and I(2) be the moments of inertia of two bodies of identical...

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  17. Consider the following two equations A) L=Iomega (B) (dL)/(dt)=tau

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  18. A particle moves on a straight line with a uniform velocity. About its...

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  19. A solid sphere, a hollow sphere and a disc, all having same mass and r...

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  20. A disk and a sphere of same radius but different masses roll on two in...

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