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Question

If most of the population on earth is migrated to poles of earth then the time duration of a day :

A
Increases
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B
Decreases
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C
Remains same
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D
First increases then decreases
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Solution

The correct option is B Decreases
External torque is zero.
Angular momentum is conserved.
I1ω1=I2ω2
If people migrate towards the pole, most of the mass gets concentrated near the rotational axis of earth due to which moment of inertia decrease due to that Angular velocity will increase. And finally duration of day will decrease.
T=2πω

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