After a skiing accident, your leg is in a cast and supported in a traction device, as shown in Figure 6-27. Find the magnitude of the force F exerted by the leg on the small pulley. (By Newton's third law, the small pulley exerts an equal and opposite force on the leg.) Let the mass m be 4.00 kg, and the angle be 31.0°.

I could probably help with this question, but you need to put fig. 6.27 where I can see it. In the meantime, maybe this earlier answer of mine may be of assistance to you (provided the diagram link is still available):
http://uk.answers.yahoo.com/question/index;_ylt=Ag782WUGph9ogGTHNTzVwWchBgx.;_ylv=3?qid=20080212181044AA7Dipi&show=7#profile-info-AA11175421

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