Mach 10 is approximately 7,600 mph. The Mach number is a measure of how fast an object is traveling relative to the speed of sound. The Mach number is calculated by dividing the speed of an object by the speed of sound, which is approximately 760 mph.
Speeds greater than Mach 5 are considered to be hypersonic. At these speeds, the force from the speed of the object compresses the air in front of it, resulting in a compression force. This force goes into exciting the chemical bonds between oxygen and nitrogen atoms. At even higher speeds, such as those experienced by space shuttles entering the atmosphere at approximately Mach 25, this force ionizes the air in front of the shuttle, creating plasma.