1. The problem statement, all variables and given/known data http://img384.imageshack.us/img384/2760/picture1uw7.png [Broken] http://g.imageshack.us/img384/picture1uw7.png/1/ [Broken] I'm trying to setup a free body diagram for this problem, and I'm not even sure where to start with the angles. That is basically my question, when do I use cos and when do I use sin. It has never made sense... Links to tutorials, or an explanation on setting up a free body diagram would be enormously helpful. Thanks!