Auniform rod ab, of mass m and length /, is smoothly jointed the end b is attached by also of length 1, 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 a is the inclination of the string to the horizontal, show that the tension in the string is of magnitude mg/(4 sin a). at the end a to a fixed straight horizontal wire ac means of a light inextensible string, show also that tan a 1/(5u)