ANSWERS: 2
  • Because it refers to the method of measuring airspeed that was developed by the Austrian physicist Ernst Mach. More information: http://www.centennialofflight.gov/essay/Dictionary/sound_barrier/DI94.htm
  • MACH is calulated as follows: MACH # = Speed of Object / Speed of Sound Therefore, the only time Mach can equal 1 is when the speed of the object is exactly the speed of sound. To learn more about how MACH is calculated, go here - http://www.grc.nasa.gov/WWW/K-12/airplane/mach.html BuzbyB also referred a very good link with - http://www.centennialofflight.gov/essay/Dictionary/sound_barrier/DI94.htm Enjoy!

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