"When a large bone such as the femur is broken, the two pieces are often pulled out of alignment by the complicated combination of tension and compression forces that arise from the muscles and tendons in the leg (see the X-ray image in figure A). To realign the bones and allow proper healing, these forces must be compensated for. A method called traction is often employed. If a total tension force of 376 N is applied to the leg as depicted in figure B to realign the parts of the femur, how much mass m must be attached to the bottom pulley?"
How do I start this problem? Please help.
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The best way to start is to examine the diagram and make a free-body diagram. Extract relevant information related to forces, angles and lengths.
If you need help doing this step, the next best thing to do is to post the original question together with all x-rays(figure A) and diagrams (figure B).