A Fan That Was Rotating at a Speed of 450

question 10

Multiple Choice

A fan that was rotating at a speed of 450 revolutions per second for 5 minutes had its speed setting turned down to 240 revolutions per second after 5.5 minutes. What is the angular acceleration over this period of time?

• A)-7 rev/min²
• B)7 rev/min²
• C)-420 rev/min²
• D)420 rev/min²

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