Question
A compact disc (CD), initially at rest, reaches an angular speed of 40 rad/s in 5.0 s.
a. What is the magnitude of its angular acceleration?
b. How many revolutions does the CD make in 5.0 s?
a. What is the magnitude of its angular acceleration?
b. How many revolutions does the CD make in 5.0 s?
Answers
Scott
a. acceleration = speed / time ... 40 / 5.0
b. (average speed) * time
...[(0 + 40)/2] * 5.0
b. (average speed) * time
...[(0 + 40)/2] * 5.0
Henry
b. 40rad/s * 1rev/6.28rad * 5s = 31.85 rev.