1 rotation/1 min * 1 min/60s * (2*Pi radian/1 rotation)
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('X' rev/minute) x (2 pi radian/rev) x (1 minute/60 sec) = 2 pi X/60 = 0.10472 Xrad/sec (rounded)
2pi/60 or pi/30 radians per second
actually 1revolution=360 degrees, then 120 revolutions=360*120 (degrees)=43200degrees now degrees to radian is simple 43200 degrees=43200*PI/180=240pi radians now we can write as 120 revolution/minute=240pi radians/minute to convert minute into sec we multiply by 60 so as min is in denominator so we sill devide it by 60, 120 revolution/minute=240pi/60 radians/sec=4pi ans = 4pi
(x radians / second) x (1 revolution / 2 pi radians) x (60 seconds / minute)= (60x) / (2 pi) (revolution / minute)Multiply (radians per sec) by (60)/(2 pi) = 9.5493(rounded) to get RPM.
-- to convert the feet to inches, multiply by 12-- to convert the minute to second, divide by 60-- combining these operations, take (feet per minute) and multiply by (12/60) = 0.2