A.) Determine the tension in the cord before the string is burned B.) Show that the cord, strong enough to support the object before the string is burned, is also strong enough to support the object as it passes through the bottom of the swing C.) The motion of the pendulum after the string is burned is periodic. Is it also simple harmonic? why or why not? Cord p 60° String A pendulum consists of a small object of mass m fastened to the end of an inextensible cord of length L. Initially, the pendulum is drawn aside through an angle of 60° with the vertical and held by a horizontal string as shown in the diagram above. This string is burned so that the pendulum is released to swing to and fro. Cord p 60° String A pendulum consists of a small object of mass m fastened to the end of an inextensible cord of length L. Initially, the pendulum is drawn aside through an angle of 60° with the vertical and held by a horizontal string as shown in the diagram above. This string is burned so that the pendulum is released to swing to and fro.