Suppose that a car wheel is spinning with angular velocity of wo. The car is then turned off and the wheel start to slow down because of friction and angular acceleration is constant. The wheel comes to rest after it has made X revolutions. What is the magnitude of the angular acceleration?

Answer 1

average velocity is ... wo / 2

time to stop is ... rev / vel = 2 X / wo

acc = vel / time = wo^2 / (2 X)