Asmall smooth ring r of weight 8.5n is threaded on a light inextensible string. the ends of the
string are attached to fixed points a and b, with a vertically above b. a horizontal force of magnitude
15.5n acts on r so that the ring is in equilibrium with angle arb = 90◦. the part ar of the string
makes an angle q with the horizontal and the part br makes an angle q with the vertical (see diagram).
the tension in the string is t n. show that t sin q = 12 and t cos q = 3.5 and hence find q.