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If the earth suddenly contrats to half o...

If the earth suddenly contrats to half of its original size without any change in mass,the new duration of the day would be :

A

12 h

B

6 h

C

3 h

D

1.5 h

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JBD PUBLICATION-MOTION OF SYSTEM OF PARTICLES AND RIGID BODY-EXAMPLE
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  6. Is the angular momentum a scalar quantity ?State its unit.

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  7. What is the direction of angular momentum of a body?

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  8. Is centre of mass a reality?

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  9. Which points on a cylinder rolling over a surface move rectilinearly ?

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  11. A ballet-dancer stretches her hands out for slowing down.What principl...

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  12. Under what conditions angular momentum of a moving body is zero?

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  15. Does the angular momentum of an eletron remain consered when the elect...

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  16. What is an isolated system?

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  17. Define centre of mass.

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  18. What is rotational analogue of mass?

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