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Velocity = Radius x RPM

For example if a body of 32 Inches in diameter rotating at 3600 rpm, the velocity is calculated by

Velocity = 32/2 * 3600

Velocity = 57,200 inches per minute

Velocity = 57,200 Inches/min * 60 Min/Hr * 1ft/12in * 1 mi/5280 ft

Velocity = 54.5 miles per hr

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