In order to heal properly from a fractured thigh a patient's leg must be kept under traction. In the system shown below the leg a kept under traction by a series of ropes and pulleys attached to a weight W. If the physical therapist specifies that the traction force directed along the leg must be 29N, what should the attached weight W be?
https://d2vlcm61l7u1fs.cloudfront.net/media%2F01f%2F01f595a0-34a5-49e3-a9f4-7c1c7387c866%2FphpKDaUW7.png