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IF EARTH WERE TO SHRINK SUDDENLY THEN ITS MOMENT OF INERTIA WILL DECREASE.
BY CONSERVATION OF ANGULAR MOMENTUM ANGULAR VELOCITY WILL INCREASE
THEREFORE LENGTH OF THE DAY WILL DECREASE
it depends on the time taken to rotate on its axis and i don''t think that its mass would affect the length of the day unless its rotating speed changes
FROM CONSERVATION OF ANGULAR MOMENTUM
AS NO EXTERNAL TORQUE IS ACTING
I W=CONSTANT WHERE W=ANGULAR VELOCITY
AS EARTH SHRINKS ITS MOMENT OF INNERTIA ABOUT ITS AXIS DECREASES THUS ITS ANGULAR VELOCITY INCRESES AND TIME PERIOD OF ROTATION ABOUT ITS OWN AXIS DECREASE
THEREFOR LENGTH DAYS BECOME SHORTER
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