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Reference 2: http://www.grc.nasa.gov/WWW/k-12/airplane/machang.html





       

In case that:
C = speed of sound
V = speed of the moving object
M = Mach number, would be M
So if an object move twice time faster that sound speed the Mach number would 2. |


When an object travels slower than sound, the ratio in this equation is greater than one, and the equation does not have a real solution. Traveling at the speed of sound makes the ratio equal one and results in a Mach angle of ninet¥y degrees. Above the speed of sound, the ratio is less than one and the Mach angle is less than ninety degrees. The faster the object moves, the narrower the cone of high pressure behind it becomes. Measuring the vertex¥ angle is a way to determine the speed of a supersonic object.


Reference 3: screenshot Screenshot from the video bellow.

Mach Number:

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http://www.grc.nasa.gov/WWW/k-12/airplane/mach.html

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Reference 2: http://www.grc.nasa.gov/WWW/k-12/airplane/machang.html

Reference 3: screenshot Screenshot from the video bellow.

Video 1: https://www.youtube.com/watch?v=gWGLAAYImage Removedhttp://videos.howstuffworks.com/discovery/29379-assignment-discovery-shock-wave-video.htm