http://img369.imageshack.us/my.php?image=peng0038rn2.jpg Question: To move a heavy crate across a floor, one end of a rope is tied to it and the other end is tied to a wall 30 ft. away. When a force of 100 lbs. is applied to a midpoint of the rope, the rope stretches so the midpoint moves to the side by 2ft. What is the force on the crate? I tried using -T+w cos30+w cos 30 to get the force on the crate but now I know its wrong. Then looking on the diagram, I cant seem to find what angle to use, since I think its one important detail on how to solve the problem. All I know is that the 100 lbs. is the tension applied to the rope and the weight of the crate was not given. Please help.