suppose the earth suddenly can't contracts and its radius becomes are by 4 equals to present radius of the earth keeping its mass same then what will be the length of the day .
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The time will be 6 hours... As by conservation of angular momentum...we can easily get the final angular velocity of earth which will be 4 times the earlier one so the time period is Inversely proportional to angular velocity therefore it will decrease by 4 times
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