12 inches
Mach 1 per second is 230,281,663 feet per second.
Mach 0.85 = 289.25 m/s (1041.29 km/h)
2 000 000 000 feet in one second
Mach One was created in 1983.
1100
647 mph
Ok, let's figure this one out: Assume mach speed is 1,010 feet per second, we could travel 689 miles in one hour. (1010 ft * 60sec *60min) / 5,280 ft = 689 mph rounded. Therefore, 0.81 of mach should be 558.09 mph
1,126 ft/s
Mach one at sea level, which is the speed of sound, is approximately 343 meters per second (1,125 feet per second) at a temperature of 20°C (68°F). This speed can vary with changes in temperature and pressure, but at standard atmospheric conditions at sea level, Mach one is commonly accepted as around 1,225 kilometers per hour (761 miles per hour).
Without a doubt, the SR-71A Blackbird (decommissioned). It is able to reach speeds around 3.3 mach (1 mach is the speed of sound) in level flight, and it is said that one achieved 5.5 mach. Under what circumstances, I do not know, but I suspect it was coming out of a dive from the edge of space, 90,000 to 100,000 feet.
Mach 1 is 1,225.044 km/h
Yes. Mach 1, speed of sound is about 1114 feet per second. MANY handguns has a muzzle velocity greater than that.