1. The problem statement, all variables and given/known data A rectangular plate is acted upon by the force and couple shown. This system is to be replaced with a single equivalent force. a) for a(alpha)=40 degrees, specify the magnitude and the line of action of the equivalent force. b)Specify the value of a(alpha) if the line of action of the equivalent force is to intersect line CD 300mm to the right of D. 2. Relevant equations http://img188.imageshack.us/img188/3503/0926091619.th.jpg [Broken] 3. The attempt at a solution Ok I've found the equivalent force-couple system at C which is -48N j, and +6.997 N.m. From there I'm lost, I don't know what to do. I've tried to use the cross product(CBxF) to find Moment at C then add up the moment... Am I going in the right direction?