### Other Answers (2)

Relevance-
Simply

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

= -2rev/s^2

but you need to convert it to rad/s^2:

1rev = 2pi rad

-2rev/s^2 * 2pi rad/1rev = -4pi rad/s^2

What is the magnitude of its average angular acceleration in rad/s^2 of the wheel?

A flywheel rotating at 12 rev/s is brought to rest in 6 s.

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