(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The flywheel of a steam engine runs with a constant angular speed of 156rev/min. When the steam is shut off, the friction of the bearings and of the air brings the wheel to rest in 2.20h. What is the tangential linear acceleration of a particle 52.4cm from the axis of rotation when the flywheel is turning at 72.5rev/min.

2. Relevant equations

At= r(alpha)

I know what the radius is, so I must find angular acceleration.

alpha = (Wf-Wi)/t

_____=(0-156)/(2.2*60)

_____=-1.18rev/min^2

Therefore

At= (52.4cm)(-1.18rev/min^2)

3. The attempt at confusion

So now that I am done, I am left wondering why someone would put 72.5 rev/min in the equation. I was tempted to put that into my equation to find alpha, but then I am lacking time. I then turned towards my linear equivalent equations, but I am lacking time it takes to decelerate to 72.5 or the amount of rotations it takes to get that far. What am i meant to do?

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# Homework Help: Flywheel of a steam engine problem

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