If all the ice on the polar caps of the earth melts, due to global warming then the duration of the day will be

Options

A. 24 hour
B. more than 24 hour
C. less than 24 hour
D. 12 hour

Answer

B

Explanation

If all the ice on the polar caps of the earth melts and is converted into water, then the water will flow away from the axis of rotation and hence the M.I. of the rotating earth will increase.
`because I_(1)omega_(1)=I_(2)omega_(2), omega_(2) ltomega_(1) " as "I_(2) gt I_(1)`
But `omega=(2pi)/(T_(1)), (2pi)/(T_(2)) lt (2pi)/(T_(1)) or (1)/(T_(2)) lt (1)/(T_(1))" or "T_(2)gt T_(1)`
`therefore ` The duration of the day will be more than 24 hour.