It depends upon the circumference of the rotating object such as a wheel.
Deriving the formula,
let the radius of the wheel be r then,
the circumference of a circle is = (2 X (pi) X r)
the total distance covered by the wheel in one min = (2 X (pi) X r) X rpm
now,
if the object's diameter is measured in meters then the formula would be,
(2 X (pi) X r X rpm X 60) / 1000
else if in different unit then just convert it to meters
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The formula for this conversion is as follows: MPH x 1.609344 = KPH To find the MPH when you know the KPH use the following formula: divide KPH by 1.609344
It depends on the size of your rotor g=(1.118x10^-5)xradius of rotor in cm x speed of centrifuge in rev/min^2
km=1000m
distance = velocity X time 1km = 20 kph X time time = 1 km/(20 kph) = 1/20 of an hour or 3 min.
Seconds/3600 = Hours