11. A 0.31 kg cart on a horizontal air track is attached to a string. The string passes over a disk-shaped pulley of mass 0.080 kg and radius 0.012 m and is pulled vertically downward with a constant force of 1.1 N. (CM = 1/2MR2) a. Find the tension in the string between the pulley and the cart. (0.97 N) b. Find the acceleration of the cart. (3.1 m/s2) Physical picture