1. The problem statement, all variables and given/known data How much torque is needed to change the speed of spinning rate of a 3.50 kg sphere with a radius of 7.50 m from 900. rpm to 200. rpm in 3.0 s? [-1924 -1.92 x 103 Nm] 2. Relevant equations t = I * α I = (2/5)mr^2 t = F * r 3. The attempt at a solution just cant get a crack at it.