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Euler-Lagrange equation application

  1. Jan 15, 2015 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations


    3. The attempt at a solution

    I have tried manipulating the equation a few different ways, but the Euler-Lagrange and the one I'm supposed to show for a) is so different that I just can't seem to work. Can someone please point me in the right direction here?
  2. jcsd
  3. Jan 15, 2015 #2


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    I think you don't need the Euler-Lagrange equation for (a). That looks like the standard derivative, just calculate it.
  4. Jan 15, 2015 #3
    Well, just calculating the derivative, I'm not sure why it is coming out the way it is? I get that the "t" component would be zeros, cancelling out its parts. However, I'm not sure what derivative/partial derivative rules are being applied to get the equation to look like the one asked for in a)?
  5. Jan 16, 2015 #4


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    Think chain rule. If you still can't figure it out, show us your attempt.
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