A Hospital patient has injured her leg, how much mass must be used to keep her leg stationary.  The leg has a mass of 2.6 kg and is 0.87 meters in length, the rope for the tension mass  is connected at 0.65 meters from the knee.

2 answers

You've posted 4 questions without any idea of YOUR thoughts. We can help you better if we know what your stumbling blocks are.
Interesting, I just answered some of these posted later under different names.