The tangential speed of something moving at an angular speed of w at a given point that is a distance r away from the center is v = wr.
So for example, a windmill spinning at 10rpm = 20pi rad/min would have a tangential speed of 100pi feet per minute = 3.6mph at a distance of 5 feet from the center (v = 10rpm x 2pi rad / rev x 5 feet = 100pi feet per minute).
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