Q. #7: A weightless tripod consisting of three legs of equal length I, smoothly jointed at the vertex, stands on a smooth horizontal plane. A weight W hangs from the apex. The tripod is prevented from collapsing by three inextensible strings, each of length , joining the mid-points of the legs. Show that the tension in each string is 33 Q. #8: A uniform semi-circular wire hangs on a rough peg, the line joining its extremities making an angle of 45 degree with the horizontal. If it is just on the point of slipping, find the coefficient of friction between the wire and the peg.