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Relative rates of change

  1. Dec 14, 2006 #1
    if you have a*v=s*w how do you get:

    delta a/a+delta v/v=delta s/s+delta w/w

    can anybody explain why this is true.
     
  2. jcsd
  3. Dec 14, 2006 #2

    arildno

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    Well, fiddle about with the expression:
    [tex](a+\delta{a})(v+\delta{v})=(s+\delta{s})(w+\delta{w})[/tex]
     
  4. Dec 14, 2006 #3
    I'm sorry I don't follow
     
  5. Dec 14, 2006 #4

    arildno

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    What do you not follow?
    Do you not understand that the equation av=sw holds for different choices of "a", "s", "v" and "w", including the choices [itex](a+\delta{a}),(s+\delta{s}),(v+\delta{v}),(w+\delta{w})[/itex]?
     
  6. Dec 14, 2006 #5
    Nevermind I got it. Thanks for your help
     
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