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What is the angular acceleration as the blades slow down?

Lets first convert rpm to rps and then multiply by 2π to get its angular velocity.

7000rpm * 60 = 420000 rps * 2π = 2638937.829 rad/s

Now just simply use.

Wf = Wi + AT

A = Wf - Wi / T

A = (0) - (2638937.829) / (3.4)

A = -776158.185 rad/s^2 <-----Answer

The answer is negative because its decelerating.