1. Aim: Rotational Motion Practice
HW:

2. Angular Displacement
A bicycle with tires 68 cm in diameter travels 8.0 km. How many revolutions do the wheels make?

3. Angular Acceleration
A cooling fan is turned off when it is running at 850 rev/min. It turns 1500 revolutions before it comes to a stop.
What was the fan’s constant angular accel.?
How long did it take the fan to come to a stop?

4. Solution a. b.

5. Rotational Dynamics
A softball player swings a bat, accelerating it from rest to 3.0 rev/s in a time of 0.2 sec. Approximate the bat as a uniform 2.2 kg rod of length 0.95 m and compute the torque the player applies to one end of it.
Uniform Rod through end (pivot): I = (1/3)ML2
Uniform rod through center (pivot): I = (1/12)ML2

6. Solution