It is said that the earth was formed from a contracting gas cloud. Suppose some time in the past, the radius of the earth was 25 times its present radius. What was then its ** of rotation on its own axis?
Let the present ** of revolution of earth be T and earlier be T0 . According to the conservation of angular momentum.
Thus, ** of revolution of earth in the past T0 = 6.25 times the present time **.
