A large horizontal circular platform (M=81.1 kg, r=3.43 m) rotates about a frictionless vertical axle. A student (m=56.3 kg) walks slowly from the rim of the platform toward the center. The angular velocity w of the system is 4.90 rad/s when the student is at the rim. Find w (in rad/s) when the student is 1.67 m from the center. [tex] L_o= L_f [/tex] [tex] (1/2)MR^2 * \omega = (MR^2)(\omega) [/tex] [tex] (1/2) (81.1)(3.43^2) = (56.3)(1.67^2)(\omega) [/tex] Solving for omega gave me 6.1 rad/s which wasn't right. Can someone help me?