1. The problem statement, all variables and given/known data A skater spins with an angular speed of 8.3 rad/s with her arms outstretched. She lowers her arms, decreasing her moment of inertia by a factor of 8.9. Ignoring the friction on the skates, determine the percent of change in her kinetic energy. Answer in percent. 2. Relevant equations KE = (1/2)Iw^2 Li = Lf 3. The attempt at a solution[/b wi = omega initial wf = omega final If Li = Lf, Iwi = (I/8.9)wf 8.9wi = wf So KEi = (1/2)I(wi^2) KEf = (1/2)(I/8.9)(wf^2) So KEf = (1/2)(I/8.9)(8.9wi^2) So I(wi^2)/2 = I(8.9wi^2)/17.8 Does that mean there is no change in kinetic energy? Also, if there is a change in kinetic energy how do I convert that to a percent?