2. 1. An automatic dryer spins wet clothes at an angular speed of 6.0 rad/s. Starting from rest, the dryer reaches its operating speed with an average angular acceleration of 3.1 rad/s?. How long does it take the dryer to come up to speed?
3. 2. A person is riding a bicycle, and its wheels have an angular velocity of 27.5 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is 15.8 revolutions. (a) How much time does it take for the bike to come to rest? (b) What is the angular acceleration (in rad/s?) of each wheel?