The forces are acting on the beam as shown, if l = 13 ft and w = 3 ft, determine the resultant couple moment. Python input: l = 13 w = 3 f2 = 160 f3 = 126 theta = 70 alpha = 45 Mx = 0 lb - ft My = 0 lb - ft Mz = 0 lb - ft Correct answer Mx = 0 lb - ft My = 0 lb - ft Mz = 1329.08887205 lb - ft