A counterweight of mass m = kg is attached to a light cord that is wound around a pulley as in Figure P11.18. The pulley is a thin hoop of radius R = cm and mass M = kg. The spokes have negligible mass. (a) What is the magnitude of the net torque on the system about the axle of the pulley? (b) When the counterweight has a speed v, the pulley has an angular speed w = v/R. Determine the magnitude of the total angular momentum of the system about the axle of the pulley. (c) Using your result from part (b) and t = dL / dt, calculate the acceleration of the counterweight .