A long cord of negligible mass is wrapped around a third pulley, Pulley C, and attached to a spring scale, as shown in Figure 3. The spring scale is pulled downward so that it exerts a constant force of magnitude PS on the cord. As the spring scale moves down a significant distance, the vertical portion of the cord moves closer and closer to the center of the pulley. Predict how the net torque exerted on the pulley, the rotational momentum of the pulley, and the rotational kinetic energy of the pulley will be changing, if at all, as the spring scale moves downward and the vertical portion moves closer to the center of the pulley.