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Homework Help: Change to polar help

  1. Oct 20, 2007 #1
    http://img187.imageshack.us/my.php?image=polargy3.jpg



    3. The attempt at a solution
    http://img484.imageshack.us/my.php?image=picture155jy1.jpg
    i get an extra cos² thi term!! WHY!!
    am i doing the substitution completely wrong?? or i forgot/left something out which i can not seem to see!

    Thank you
     
  2. jcsd
  3. Oct 21, 2007 #2

    Gib Z

    User Avatar
    Homework Helper

    4th line, [itex]dw_1= -w\sin \phi d\phi[/itex] unfortunately :(
     
  4. Oct 21, 2007 #3
    oops, i meant to write dw1 = cos thi dw.
    nevermind, i got it.
    I have to use Jacobian matrix instead of what i did.
     
    Last edited: Oct 21, 2007
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