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for example, typically rotate steadily at 16 2/3, 33 1/3, 45 rpm or 78 rpm (0.28, 0.55, 0.75, or 1.3, respectively, in Hz).
* Air turbine rotating up to (25 kHz)
* Modern air turbine dental drills can rotate at over (13.3 kHz).
* The second hand of a conventional analog clock rotates at 1 rpm.
* Audio CD players read their discs at a precise, constant rate (4.3218 Mbit/s

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