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A dancer on ice spins faster when she fo...

A dancer on ice spins faster when she folds her arms. This is due to

A

decrease in energy & increase in angular momentum

B

increase in K.E & decrease in angular momentum

C

increase in K.E & constant in angular momentum

D

Decrease in friction at the skates

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Verified by Experts

The correct Answer is:
c
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SURA PUBLICATION-MOTION OF SYSTEM OF PARTICLES AND RIGID BODIES-MULTIPLE CHOICE QUESTIONS :
  1. If I, alpha and tau are MI, angular acceleration and torque respective...

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  2. Which of the following has largest M.I

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  3. A dancer on ice spins faster when she folds her arms. This is due to

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  4. A bomb travelling a parabolic path explodes in mid air. The C.M. Of fr...

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  5. Consider a system of two identical particles. One is at rest and the o...

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  6. The least coefficient of friction for an inclined plane inclined at an...

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  7. Three identical spherical shells, each of mass m and radius r are plac...

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  8. A ball rolls without slipping. The radius of gyration of the ball abou...

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  9. The direction of angular velocity vector is along:

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  10. If there is change of angular momentum from J to 4J in 4S, then the to...

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

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  12. The ratio of the radii of gyration of a circular disc to that of circu...

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  13. The M.I of a uniform circular disc is maximum about an axis perpendicu...

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  14. If a person standing on a rotating disc stretches out his hands, the a...

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  15. A sphere of radius r is rolling without sliding. What is ratio of rota...

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  16. A disc is rolling on the inclined plane. What is the ratio of its rota...

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  17. A sphere rolls down an inclined plane of inclination theta. What is th...

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  18. Planetary motion in the solar system is based on

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  19. Two rings of radii R & nR made from the same wire have the ratio of M....

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  20. The M.I of a ring about one of its diameter is I. The M.I about a tang...

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