IF THE POLAR ICE CAPS OF THE EARTH WERE TO MELT

  • ·         If the polar ice caps of the earth were to melt, what would the effect of the length of the day be?

     Answer: Earth rotates about its polar axis. When ice of polar caps of earth melts, mass concentrated near the axis of rotation spreads out. Therefore, moment of inertia I increase.
   As no external torque acts, angular momentum constant. i.e L = Iω = I(2π/T)

   With increase of I, T will increase i.e. length of the day will increase.

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