How do you define RPM (revolutions per minute)?
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O The speed at which the engine crankshaft is turning
O The speed at which the break is applied
O The speed at which the steering is turning
O The speed at which the piston is working
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Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or with the notation min−1) is the number of turns in one minute. It is a unit of rotational speed or the frequency of rotation around a fixed axis.
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