1. The problem statement, all variables and given/known data A uniform pole of mass is at rest on an incline of angle , secured by a horizontal rope as shown in the figure. For what angle does the situation require the greatest coefficient of friction? http://img146.imageshack.us/img146/4906/rw1257xg9.jpg [Broken] http://g.imageshack.us/img146/rw1257xg9.jpg/1/ [Broken] 2. Relevant equations I have no idea. 3. The attempt at a solution I know that the formula for friction in this case is u = sin(2theta)/(3+cos(2theta)), and that somehow I am supposed to get the answer of 54.7 degrees from that. However, I have no clue about how to get either the formula or the answer. Please help.