A 4.00-kg counterweight is attached to a light cord, which is wound around a spool (refer to Fig. 10.20). The spool is a uniform solid cylinder of radius 8.00 cm and mass 2.00 kg.
(a) What is the net torque on the system about the point O?
(b) When the counterweight has a speed v, the pulley has an angular speed ώ = v/R. Determine the total angular momentum of the system about O.
(c) Using the fact that π = d L/dt and your result from (b), calculate the acceleration of the counterweight.