1. The problem statement, all variables and given/known data The mass of a star is 1.51·1031 kg and its angular velocity is 1.50E-7 rad/s. Find its new angular velocity if the diameter suddenly shrinks to 0.49 times its present size. Assume a uniform mass distribution before and after. Icm for a solid sphere of uniform density is 2/5 mr2 2. Relevant equations L=Iw L(int)=L(final) 3. The attempt at a solution L(int) = [(2/5)M*R^2]*(wint) L(final) = [(2/5)M*(0.49)*R^2]*(wfinal) And I got stuck there. I dont know how to find the radius and I think thats holding me back.