The Polar Ice Cap Is Now Melting

imageAccording to NASA, the polar ice cap is now melting at the alarming rate and sea-level rise all around the Earth. This redistribution of mass will cause the Earth’s day to become

a) longer
b) shorter
c) stay the same
d) the earth will stop rotating
e) not enough information

Answer. Posted on Thursday, February 5, 2015.

a) longer

If we take the mass of the polar ice cap and put it along the equator, we would expect it slows the Earth’s rotation.
J=Iω , where J is angular momentum stays constant as long as there is no outside disturbance, I is moment of inertia increases because of the mass redistribution and finally ω is angular velocity decreases according the formula.


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