The string passes over a disk-shaped pulley of mass 0.80 kg and radius 0.

A 0.6-kg cart on a horizontal air track is attached to a string. The string passes over a disk-shaped pulley of mass 0.80 kg and radius 0.01 m and is pulled vertically downward with a constant force of 5.0 N. Find (a) the tension in the string between the pulley and the cart and (b) the acceleration of the cart.