A uniform solid disk with a mass of 28.3 kg and a radius of 0.414 m is free to rotate about a frictionless axle. Forces of 90.0 N and 125 N are applied to the disk, as the drawing illustrates. http://www.webassign.net/CJ/p9-31.gif What is the net torque produced by the two forces? (Assume counterclockwise is the positive direction.) What is the angular acceleration of the disk? For the first question, I thought maybe to do: 90.0 N * r + 125 * r = 89.01 That is wrong. I know of the eqn. torque = I * alpha but I dont know how to use it in this problem.