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Homework Help: Power law equation help

  1. Feb 10, 2016 #1
    1. The problem statement, all variables and given/known data
    need to solve for v? I also know the value of x=0.02

    2. Relevant equations
    v(x)= 47.8 ⋅ (0.451/x)^(5.39)

    3. The attempt at a solution
    how do I take the log of both sides, is that the right approach to solve for v?
  2. jcsd
  3. Feb 10, 2016 #2


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    Homework Helper

    Apply the product rule then the power rule.
  4. Feb 10, 2016 #3


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    But, if you already know x, you don't have anything to solve. Just put .02 in for x and evaluate.
  5. Feb 10, 2016 #4
    I am little confused, my calculus skills stayed in first year. Do put 0.02 in the x term on the left side of the equation also, and just solve for V?
  6. Feb 10, 2016 #5


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    Staff Emeritus
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    Gold Member

    You didn't state the problem accurately, but if it's asking you to determine v(0.02), then all you have to do is to replace the x on the right by 0.02 and perform the computations. To "solve for v" would be to find an equivalent equation with v alone on one side, but the equation is already of that form, so what you need to do to solve for v is nothing at all.

    That would be a good approach if you wanted to solve for x.
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