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

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

1. A

Increases

2. B

Decreases

3. C

Remains same

4. D

First increases then decreases

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### Solution:

If population migrates to poles then Radius of gyration decreases then

moment of inertial decreases

By law of conservation of angular momentum

We know${I}_{1}{\omega }_{1}={I}_{2}{\omega }_{2}$

and ${\text{R}}^{\text{2}}\propto \text{T}$where T is time period

Here in this case R is decreased so T will decrease hence time duration of a day decreases

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