How to Calculate Relative Rates of Change with a*v=s*w?

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Discussion Overview

The discussion revolves around the calculation of relative rates of change in the context of the equation a*v = s*w. Participants explore how to derive the expression delta a/a + delta v/v = delta s/s + delta w/w from this equation.

Discussion Character

  • Technical explanation

Main Points Raised

  • One participant asks how to derive the expression delta a/a + delta v/v = delta s/s + delta w/w from the equation a*v = s*w.
  • Another participant suggests manipulating the original equation by substituting (a + delta a)(v + delta v) for (s + delta s)(w + delta w).
  • A third participant expresses confusion about the explanation provided.
  • The second participant clarifies that the equation holds for various choices of the variables involved, including the perturbed values.
  • The initial questioner later indicates that they have understood the explanation provided.

Areas of Agreement / Disagreement

The discussion includes some confusion regarding the derivation, but ultimately the initial questioner expresses understanding, suggesting a resolution of their personal uncertainty, though not necessarily a consensus among all participants.

Contextual Notes

There may be limitations in understanding the assumptions behind the manipulation of the equation, as well as the conditions under which the equation holds true.

flash9286
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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.
 
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Well, fiddle about with the expression:
[tex](a+\delta{a})(v+\delta{v})=(s+\delta{s})(w+\delta{w})[/tex]
 
I'm sorry I don't follow
 
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]?
 
Nevermind I got it. Thanks for your help
 

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