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Answers: From Wikipedia:
Since the speed of sound increases as the warmth increases, the actual speed of an object travelling at Mach 1 will depend on the fluid heat around it. Mach number is useful because the fluid behave in a similar method at the same Mach number. So, an aircraft travelling at Mach 1 at the deep level (340.3 m/s, 1,225.08 km/h) will experience shock breakers in much like manner as when it is travelling at Mach 1 at 11,000 m (36,000 ft), even though it is travelling at 295 m/s (654.632 mph, 1,062 km/h, 86% of its speed at deep-sea level).
From NASA:
The Mach number depends on the speed of sound within the gas and the speed of sound depends on the type of gas and the heat of the gas. The speed of sound vary from planet to planet. On Earth, the atmosphere is composed of mostly diatomic nitrogen and oxygen, and the temperature depends on the altitude contained by a rather complex course. Scientists and engineers have created a numerical model of the atmosphere to help them story for the changing effects of heat with altitude. Mars also have an atmosphere composed of mostly carbon dioxide. There is a similar mathematical model of the Martian atmosphere. We hold created an atmospheric calculator to let you study the variability of sound speed beside planet and altitude.
The nasa site has a calculator to determine actual Mach speeds...
Aerospace website have a handy chart for determining Mach speeds...
Depends on altitude and humidity. Roughly 720 mph +-
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