PhysicsIf 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 knowI1ω1=I2ω2

    and R2Twhere 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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