1. The problem statement, all variables and given/known data http://img512.imageshack.us/img512/2617/staticsquestion4.jpg [Broken] 2. Relevant equations - Ability to resolve forces into components - M = Fd 3. The attempt at a solution (a) Resolve the force acting at an angle into components... 10kN force = -10cos50i - 10 sin 50 j kN Therefore, resultant R becomes... = (-10cos50)i + (15 - 3 - 10 sin 50)j kN = -6.428i + 4.3396j kN (with a magnitude of 7.756kN) (b) This is where I get stuck. I basically calculated the moments created by the individual elements of R, F1 = 15kn force F2 = 3kn force F3 = vertical component 10kn force and, because I am using the joint with the wall as an origin, the line of action of the horizontal component passes through my origin thus no moment. M1 = 15*3 = 45kNm M2 = -3*1.5 = -4.5kNm M3 = (-10 sin 50)*9 = -68.944kNm Sum of moments = 45 - 4.5 - 68.944 = -28.444kNm and then I get stuck. Do you add the moment you've just found to the moment provide in the couple, then sub. back into M=Fd where F=R? Help!