1. The problem statement, all variables and given/known data http://img84.imageshack.us/img84/1715/given2.jpg [Broken] A weightless beam AO is held in a horizontal position (at the xy plane) as described. At its tip O the ball is attached to a ball joint, and at points C and A its tied via wires. horizontal wire CD and slanted wire AB, whose in the plane parallel to xz. At point E acts on the beam vertical force Q. The shape OKAD is a rectangle (look at the upper view in the drawing). Given: http://img35.imageshack.us/img35/9106/given1.jpg [Broken] 3. The attempt at a solution http://img215.imageshack.us/img215/2376/per1v.jpg [Broken] http://img845.imageshack.us/img845/9779/per2.jpg [Broken] They give out Oz as 0.86666 [kN]. I doubt this could just be a rounding error?