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  4. Assertion: If polar ice melts, days will be longer. Reason: Moment of inertia increases and thus angular velocity decreases.

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Q. Assertion: If polar ice melts, days will be longer.
Reason: Moment of inertia increases and thus angular velocity decreases.

AIIMSAIIMS 2000System of Particles and Rotational Motion

Solution:

As the polar ice melts, it will flow towards the equator thereby increasing the moment of inertia of earth. Hence the angular velocity decreases. So, the day length will become longer.