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10. Rotational Mechanics
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Q20 of 149 Page 192

If the ice at the poles melts and flows towards the equator, how will it affect the duration of day-night?

If the ice at pole melts and flows towards the equator then the radius at that region increases. This increases the moment of inertia. So, the angular velocity also decreases and the duration of day night increases.


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18

The density of a rod AB continuously increases from A to B. Is it easier to set it in rotation by clamping it at A and applying a perpendicular force at B or by clamping it at B and applying the force at A?

19

When tall buildings are constructed on earth, the duration of day-night slightly increases. Is it true?

21

A hollow sphere, a solid sphere, a disc and a ring all having same mass and radius are rolled down on an inclined plane. If no slipping takes place, which one will

take the smallest time to cover a given length?


22

A sphere rolls on a horizontal surface. Is there any point of the sphere which has a vertical velocity?

Questions · 149
10. Rotational Mechanics
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