Suppose the earth suddenly expends and its radius become 2R (R = radius of earth) keeping its mass same, then that will be the length of the day which at present is of 24 hours?

Suppose the earth suddenly expends and its radius become 2R (R = radiu

1.	Suppose the earth suddenly expends and its radius become 2R (R = radius of earth) keeping its mass same, then that will be the length of the day which at present is of 24 hours?
Answer» 1.5 hr 6 hr 96 hr 36 hr Solution :Here, `L_(1)=L_(2)` `I_(1)W_(1)=I_(2)W_(2)` `therefore (2)/(5)MR_(1)^(2)W_(1)=(2)/(5)MR_(2)^(2)W_(2)` `therefore R_(1)^(2)XX(2PI)/(T_(1))=R_(2)^(2)xx(2pi)/(T_(2))` `therefore (R_(1)^(2))/(T_(1))=((2R_(1))^(2))/(T_(2))` `therefore (1)/(24)=(4)/(T_(2))` `therefore T_(2)=96hr`