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Lagrangian problem

  1. Aug 28, 2007 #1
    I'm having trouble with this problem:
    Find what is conserved in space where an infinite cylindrical helix is homogeneous.

    It comes from Mechanics by Landau and Lif****z, page 21, solution on page 22. Here is a google books link to it
    (the solution is at the top of the linked page 22, part h)

    I don't see why partial L/partial phi is dM_z/dt..
  2. jcsd
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