A bob of mass m is suspended from a fixed point with a massless string of length L (i. e., it is a pendulum). You are to investigate the motion in which the string moves in a cone with half-angle θ.What tangential speed, v, must the bob have so that it moves in a horizontal circle with the string always maintaining an angle θ from the vertical? Express your answer in terms of some or all of the variables m, L, and θ and the acceleration due to gravity, g.