The weights of the arms OA and AB of the robotic manipulator act at their midpoints. The d...

The weights of the arms OA and AB of the robotic manipulator act at their midpoints. The direction cosines of the centerline of arm OA are cos θx = 0.500, cos θy = 0.866, and cos θZ = 0, and the direction cosines of the centerline of arm AB are cos θx = 0.707, cos θy = 0.619, and cos θZ = –0.342. What is the sum of the moments about O due to the two forces?