Posted by **George** on Thursday, April 12, 2012 at 4:53pm.

Rotating initially at 1800 rpm, a wheel with a diameter of 74.0 cm is brought to rest in 11.0 s. Calculate the magnitude of its angular acceleration in radians/second^2

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**drwls**, Thursday, April 12, 2012 at 5:03pm
The wheel radius makes no difference. They want an ANGULAR acceleration (or, in this case, deceleration) rate.

So, convert 1800 rpm to radians/s (which you surely know how to do) and divide the result by 11.0 seconds.

You should strictly put a minus sign in front of the number, to indicate deceleration.

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**George**, Thursday, April 12, 2012 at 5:14pm
so do you not need the diameter for anything?

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**drwls**, Thursday, April 12, 2012 at 5:18pm
If you don't need the radius, you don't need the diameter

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