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## Homework Statement

A rotating sphere contract slowly due to internal forces to (1/n)th of its original radius.What happens to its angular velocity.Show that increase in its energy equals the work done during its contraction.

## Homework Equations

## The Attempt at a Solution

(2/5)MR^2*w_1=(2/5)M(R-R/n)^2*w_2

From this we should find the change in w.Am I correct?

Regarding the workdone: Please help me to start with