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If radius of the earth contracts to half...

If radius of the earth contracts to half of its present value without change in its mass, what will be the new duration of the day?

A

`24` hours

B

`18`hours

C

`6` hours

D

`3` hours

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AAKASH INSTITUTE ENGLISH-SYSTEM OF PARTICLES AND ROTATIONAL MOTION-Assignment (Section - A) Objective Type Questions (One option is correct)
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  2. A ring of mass 10kg and diameter 0.4m is rotated about an axis passing...

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  4. A wheel whose moment of inertia is 10kgm^(2) has an initial angular ve...

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  6. A fan of moment of inertia 0.6kgm^(2) is moving with a speed of 0.5 r....

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  7. A hollow cylinder open at both ends slides without rotating, and then ...

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  8. A solid sphere of mas 2kg rolls on a table with linear speed of 1 m//s...

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  9. The moment of inertia of a uniform cicrular disc about its diameter is...

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  10. A flywheel rotating about a fixed axis has a kinetic energy of 360J wh...

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  11. We have two spheres, one of which is hollow and the other solid. They ...

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  12. The moment of inertia of a body about a given axis is 1.2 kg m^(2). In...

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  13. A solid cylinder of mass 20 kg rotates about its axis with angular vel...

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  14. A solid sphere is rolling without slipping on a horizontal plane. The ...

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  15. If I(1) is the moment of inertia of a thin rod about an axis perpendic...

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  16. A wheel of moment of inertia 30 kg m^(2) is rotating at 10 rotations p...

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  17. A ring of mass 1kg and radius 1m is moving with a velocity of 1m//s by...

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  18. A disc and a ring of the same mass are rolling down frictionless incli...

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  19. The moment of inertia of a thing uniform rod of length L and mass M, a...

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  20. Two bodies with moment of inertia l(1) and l(2) (l(1) gt l(2)) have eq...

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