CM5: In the classic video game Donkey Kong, Donkey Kong is an ape who can move by rolling on top of a barrel, as in the figure. If the barrel is a hollow cylinder with a radius of 15 cm, length of 50 cm, and mass of 12 kg, how much force and in what direction does Donkey Kong need to apply in order to give the barrel an angular acceleration of 2 rad/s2? You may reference the wikipedia page on moments of inertia for this problem.