A uniform rod AB, of mass m and length l, is smoothly jointed at the end A to a fixed straight horizontal wire AC. The end B is attached by means of a light inextensible string, also of length l, to a small ring, of mass m, which can slide on the wire, the coefficient of friction between the ring and the wire being ?. The rod is in equilibrium in the vertical plane through the wire. Given that ? is the inclination of the string to the horizontal, show that the tension in the string is of magnitude
mg/ (4sin? )

Show also that tan? >= 1/ (5?)

I need help in the 1st part because I haven't gotten to the 2nd part yet, but feel free to do the 2nd part if you want and tell me please.