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Lagrangian problem

  • Thread starter Wumbate
  • Start date
  • #1
Wumbate
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
http://books.google.com/books?id=LmAV8q_OOOgC&pg=PP1&dq=mechanics+landau&ei=uDjURv_AHKHApgLR28HQBw&sig=iiqa9SIPmqtlKY3nimsuLjBqCbM&hl=en#PPA22,M1
(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..
 

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