Two workers are pushing and pulling a box. The force F1 is 1000N at 45 from the x-axis and the force F2 is 500 N, 30 up from the x-axis. (a) Replace these two forces by an equivalent system of a force at O plus a couple. (b) Compute a point A at which the resultant force alone produces an equivalent effect. 1.8 m 1.8 m y F2 1.5 m O X 0.5 m F