A flywheel turns through 60 rev as it slows from an angular speed of 2.8 rad/s to a stop.

Question

How much time is required for it to complete the first 30 of the 60 revolutions?

Answer 1

ave speed = 1.4 rad/s

stop time = 2 * π * 60 / 1.4

acceleration = 2.8 rad/s / stop time
... negative ... wheel is stopping

30 * 2 * π = 1/2 a t^2 + 2.8 t
... solve for t

Answer 2

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Answer 3

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