Answer to Question #77660 in Physics for Adam

Question

A wheel of 40cm radius rotates on a stationary rim. It is uniformly speeded up from a rest to a speed of 900 rpm. In a time of 20 sec.
A. Find the constant acceleration.
B. The tangential accelerating of the rim.

2. A pulley of 5cm radius of a motor is turning at 30 revolution per second. And slow down uniformly to 20 revolution per second in 2 second. Calculate
A. The angular acceleration of the motor
B. The number of revolution it made this time
C. The length of belt it winds in this time