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?
If you want the speed of the object you have to measure in rpm. You can only measure in kph if you want to measure the speed of a surface on the object (e.g. the rotational speed at the equator of the earth)
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