It would depend on the size of the circular item you are rotating. Divide the circumference of the item ( in meters) into 272.23, and then multiply the answer by 60 seconds, to get rpm.
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To convert speed from meters per second (m/s) to revolutions per minute (RPM), you need to know the circumference of the rotating object. Without that information, it is not possible to directly convert mach 0.8 or 272.23 m/s to RPM. RPM is a measure of rotational speed, whereas mach is a unit of relative velocity to the speed of sound.
Mach 500 means 500 times the speed of sound. The speed of sound in air is somewhere around 350 meters/second. If you multiply that, you get approximately 175,000 meters/second, or 175 kilometers/second. Note that the speed of sound can vary, depending on several conditions.
1,126 ft/s
Mach 6 is about 4,449.3 mph
Mach 1 is the speed of sound, which is 343 meters per second, or 343 m/s. Mach 8 is 8 times faster than the speed of sound . 8 X 343 2,744 m/s or 2.74 km/s
Rounded to two decimal places, Mach 1 is equal to 761.21 miles per hour. Multiplying this by 1.6 gives us 1217.38 miles per hour.Converting 1217.38 miles per hour to metres per second gives us 544.46 metres per second.