ceiling fan is turned on and reaches an angular speed of 132rev/min in 20s. It is then turned off and coasts to a stop in an additional 40s. The ratio of the average angular acceleration for the first 20s to that for the last 40s is which of the following?  a. 6.6s b. 6.4s c. -0.15 d. -2.0

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter10: Rotational Motion
Section: Chapter Questions
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A ceiling fan is turned on and reaches an angular speed of 132rev/min in 20s. It is then turned off and coasts to a stop in an additional 40s. The ratio of the average angular acceleration for the first 20s to that for the last 40s is which of the following? 

a. 6.6s

b. 6.4s

c. -0.15

d. -2.0

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