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A flywheel rotates with a uniform angular acceleration. Its angular velocity increases from 20π rad/s to 40π rad/s in 10 seconds.

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A flywheel rotates with a uniform angular acceleration. Its angular velocity increases from 20π rad/s to 40π rad/s in 10 seconds. How many rotations did it make in this period? 

(a) 80 

(b) 100 

(c) 120 

(d) 150

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1 Answer

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Best answer

Correct Answer is:  (d) 150

θ = 2πn = (ωi + ωf / 2) t = 20π + 40π / 2). 10 = 300π

∴ n = 150

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