(sorry about another topic but this week's HW is hard @_@) 1. The problem statement, all variables and given/known data A circular-shaped object has an inner radius of 6 cm and an outer radius of 22 cm. Three forces (acting perpendicular to the axis of rotation) of magnitudes 13 N, 28 N, and 13 N act on the object, as shown. The force of magnitude 28 N acts 40◦ below the horizontal. Find the magnitude of the net torque on the wheel about the axle through the center of the object. Answer in units of N · m. 2. Relevant equations Torque = Fd sin (th) 3. The attempt at a solution I ignored the mass because the teacher didn't mention anything about reading over the moment of intertia section in our textbook, but I think she was wrong... Anyway: Clockwise as the positive direction. Net Torque = (13 * 0.28) + (13 * 0.28) - (28 * 0.06 sin 40) Net torque = 6.200116816 m*N (WRONG) T_T I tried reading the section, but it gave me an equation (Net Torque = Moment of intertia * angular acceleration) I couldn't do anything with, as I didn't know how to solve for the angular acceleration.