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1. The problem statement, all variables and given/known data

An electric fan is turned off, and its angular velocity decreases uniformly from 500 rev/min to 200 rm rev/min in 4.00 s.

Find the angular acceleration in rev/s and the number of revolutions made by the motor in the 4.00 interval.

2. Relevant equations

3. The attempt at a solution

I got -1.25 for alpha in rev/sec^2, which is correct.

How come the number of revolutions isn't 5 revolutions?

(alpha) (time)=

(-1.25)(4 sec)=5 rev (-5) rev

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# Homework Help: Angular acceleration of a fan

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