- #1
Piano man
- 75
- 0
I've got a question about angular momentum arising from Landau-Lifgarbagez p21.
Firstly, I'm not sure where this equation comes from:
[tex]M_z=\sum_a \frac{\partial L}{\partial \dot{\phi}_a}[/tex]
and from that, how do you get
[tex]M_z=\sum_a m_a(x_a \dot{y}_a-y_a \dot{x}_a)[/tex]
Thanks for any help.
Firstly, I'm not sure where this equation comes from:
[tex]M_z=\sum_a \frac{\partial L}{\partial \dot{\phi}_a}[/tex]
and from that, how do you get
[tex]M_z=\sum_a m_a(x_a \dot{y}_a-y_a \dot{x}_a)[/tex]
Thanks for any help.