what will happen to the moment of inertia of earth and time duration of day on earth if polar ice on earth melts. please elaborate the answer

Asked by Ashok Maheshwari | 9th Sep, 2015, 10:29: AM

Expert Answer:

The Earth rotates about its polar axis. When the polar ice on earth melts, the concentrated mass at the axis of rotation spreads out. hence, moment of inertia I increases.
As there will not be any torque act.
begin mathsize 12px style straight L space equals space Iω space equals space straight I open parentheses fraction numerator 2 straight pi over denominator straight T end fraction close parentheses space equals space constant end style
As the moment of inertia I increases, T will increase eventually, length of the day will increase.

Answered by Priyanka Kumbhar | 9th Sep, 2015, 04:24: PM