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Euler-Lagrange equation application

  1. Jan 15, 2015 #1

    Ascendant78

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    1. The problem statement, all variables and given/known data

    Screen_Shot001.jpg

    2. Relevant equations

    Screen_Shot002.jpg

    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?
     
    Ascendant78, Jan 15, 2015
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  3. Jan 15, 2015 #2

    mfb

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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.
     
    mfb, Jan 15, 2015
  4. Jan 15, 2015 #3

    Ascendant78

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    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)?
     
    Ascendant78, Jan 15, 2015
  5. Jan 16, 2015 #4

    vela

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    Think chain rule. If you still can't figure it out, show us your attempt.
     
    vela, Jan 16, 2015
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