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## Homework Statement

The mass of a star is 1.370×1031 kg and it performs one rotation in 38.10 day. Find its new period (in days) if the diameter suddenly shrinks to 0.330 times its present size. Assume a uniform mass distribution before and after.

## Homework Equations

Ii * Wi = If * Wf

2/5MR^2 * 1rot/38.1 days = (2/5MR^2*0.330^2) * Wf

## The Attempt at a Solution

I am not sure what cancels out

I thought it would be something like

1rot/38.1days = .330^2 * Wf

solve for Wf

But that didn't work. .241s was not correct