I had a look at a huge windmill and was wondering how fast the blades are spinning. Obviously, the distance the blades make is different on the outside than on the inside. Is the speed of a rotating object always measured in rpm and not in mph?
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RPM is the easiest way to do it, and if you have the diameter of what is spinning you can easily use it to determine the absolute speed of any part of it at any point.
You absolutely could measure the speed other ways. You could say that the tip of the fan blade is moving 30 miles per hour compared to the stationary center. It is just that doing so doesn’t tend to be particularly useful most of the time.
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