[Home]Rpm

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The theory of relativity sets limits to rotational speed for an object of a certain diameter. When the rotational speed or diameter increases, a point on the perimeter will move faster, but cannot move faster than the speed of light. If the rotational center is made to move faster, the rotating object will deform so that the perimeter moves at its allowed speed. This effect can be noted on computer hard disks.



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Short for revolutions per minute, rpm is a unit for rotational speed. Gramophone records typically rotate with 33, 45, or 78 rpm. Aircraft motors can rotate with 8000 rpm. An automobile's motor typically makes between 1000 and 4000 rpm.


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Last edited September 22, 2001 4:23 am by Css (diff)
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