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If a person sitting on a rotating stool ...

If a person sitting on a rotating stool with his hands outstretched, suddenly lowers his hands, then his

A

his angular velocity decreases

B

his moment of inertia decreases.

C

his angular velocity remains constant

D

his angular momentum increases.

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The correct Answer is:
B
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MOTION-ROTATIONAL MOTION -Exercise - 1
  1. The rate of change of angular momentum is called

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  2. The angular velocity of a body changes from one revolution per 9 sec...

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  3. If a person sitting on a rotating stool with his hands outstretched, s...

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  4. The rotational kinetic energy of a rigid body of moment of inertia 5 ...

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  5. A circular ring of mass 1kg and radius 0.2m executes 10 revolutions pe...

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  6. Which quantity is not directly related with rotational motion

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  7. A particle of mass m is rotating in a plane in circular path of radius...

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  8. When a mass is rotating in a plane about a fixed point, its angular mo...

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  9. The rotational kinetic energy is -

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  10. A rigid body is rotating about an axis. The best way to stop it is app...

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  11. A constant torque acting on a uniform circular wheel changes its anglu...

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  12. The rate of change of angular momentum is called

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  13. When a constant torque is applied on a rigid body, then

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  14. If torque is zero, then

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  15. The grinding stone of a flour mill is rotating at 600 rad/sec. for thi...

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  16. A fly wheel of moment of inertia I is rotating at n revolutions per se...

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  17. A circular disc has a mass of 1kg and radius 40 cm. It is rotating abo...

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  18. The rotational kinctic energy of a body rotating about proportional to

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  19. When different regular bodies roll down along an inclined plane from r...

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  20. A solid cylinder starts rolling from a height h on an inclined plane. ...

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