1.

Let g be the acceleration due to gravity at earth's surface and K be the rotational kinetic energy of the earth. Suppose the earth's radius decreases by 2% keeping all other quantities same, then [BHU 1994; JIPMER 2000]

A. g decreases by 2% and K decreases by 4%
B.    g decreases by 4% and K increases by 2%
C.    g increases by 4% and K increases by 4%
D.    g decreases by 4% and K increases by 4%
Answer» D.    g decreases by 4% and K increases by 4%


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