QR: Tension, Rotation, Rolling and Sliding

Here is the quiz question that we did in the last class, and the quiz question that we did NOT have time to do in that class but we saw the demo for anyway. Answers are indicated. For the first one, one needs to consider the tau= I*alpha form of Newton's equation, that can be worked out using the free body diagram of the pulley. For the second one, we need to consider the energy conservation including not only the translational kinetic energy but also the rotational kinetic energy. We have not covered the rotational kinetic energy, but we will do that on 11-10.