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Finding relative error for radial acceleration

  1. Jul 12, 2016 #1
    1. The problem statement, all variables and given/known data

    I'm trying to find da/a to calculate the relative possible error in the radial acceleration. The equation I have to derive from is a = 4π²n²rt ⁻² (it cannot be a = v²/r). I'm not really sure how to find da since it has 3 variables?

    2. Relevant equations

    a = 4π²n²rt ⁻²
    da/a = ?

    3. The attempt at a solution

    I'm assuming you use the u-substitution method...? Any tips or websites that can help me do this?
  2. jcsd
  3. Jul 13, 2016 #2


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    Homework Helper
    Gold Member

    Take natural log on both sides and then differentiate w.r.t a. You'll need the chain rule of differentiation.
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