1. A compact disk spins with angular velocity 43.5rad/s . The player is turned off, and 2.95s later the CD has stopped.Find its average angular acceleration.
2. A machine shop grinding wheel accelerates from rest with a constant angular acceleration of 2.7rad/s^2 for 6.6s and is then brought to rest with a constant angular acceleration of -4.0rad/s^2. Find the total number of revolutions turned.
3. A 1.60m diameter wagon wheel makes one revolution in 3.70s . What's the tangential speed of a point in its rim?