What is the magnitude of its average angular acceleration in rad/s^2 of the wheel?
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A flywheel rotating at 12 rev/s is brought to rest in 6 s.
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α = ω/t (ω----->angular velocity α------->angular acceleration)
α = 12x2π/6
= 4π rad/sec^2
ave angular acceleration = change in angular velocity / change in time
= -12rev/s / 6s
but you need to convert it to rad/s^2:
1rev = 2pi rad
-2rev/s^2 * 2pi rad/1rev = -4pi rad/s^2
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