An automatic dryer spins wet clothes at an angular speed of 4.3 rad/s. Starting from rest, the dryer reaches its operating speed with an average angular acceleration of 4.0 rad/s2. How long does it take the dryer to come up to speed

The time taken by dryer to come up to speed is 1.075 seconds.

Explanation:

Initial angular speed,

Final angular speed,

The dryer reaches its operating speed with an average angular acceleration of,

Let t is the time taken by dryer to come up to speed. Using first equation of motion as :

So, the time taken by dryer to come up to speed is 1.075 seconds.                    

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