will someone please help me help my son with this physics problem? a board is held horizontal by a cable. the cable is vertical (90degrees to the board). the board is 11 meters long. at the left end of the board is a fulcrum at the right end is the cable. 5 meters from the left end is a weight of 100n and 9 meters from the left end is a weight of 150n. what is the force on the cable.