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Mach Number 2

  1. Dec 3, 2006 #1
    1. The problem statement, all variables and given/known data
    A military airplane can travel at mach 2.00 What is the speed in km/h at sea level and at 0 degress

    2. Relevant equations
    mach number=speed of object/speed of sound

    3. The attempt at a solution
    speed of object=speed of sound divided by mach number
    322meters per second/2.00
    =166m/s thats answer i got for the 0 degrees but its wrong because the answer is supposed 2390km/h i dont know how to get the sea level one.
  2. jcsd
  3. Dec 3, 2006 #2
    The speed of sound changes with density. It travels faster under water for instance.
  4. Dec 3, 2006 #3
    wat do u mean

    so i can get the answer i dont think the teacher wanted us to the density thing, is there another way of doing this
  5. Dec 3, 2006 #4

    D H

    Staff: Mentor


    Try again. If the speed limit sign says "30 miles per hour" and the officer says "I just clocked you at twice the posted limit", does that mean you were going 15 mph or 60?
    Last edited: Dec 3, 2006
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