Problem 13. A bar lies on a horizontal table (shown here in a top view). The xy axes are in the plane of the table. Depending upon how it is

attached to the table, the bar can rotate about an axle through point A, B or C. Use F = 20 N, F2 = 30 N, F3 = 25 N, L1 = 1 m, L2 = 0.25 m,L3 =0.75 m and 0 = 25°. (a) Determine the net torque about axis A. (b) Determine the net torque about axis B. (c) Determine the net torque about axis C. Your answers to all three parts should be expressed in an xyz coordinate system.