Register to reply

When the Lagrangians are equals?

by rmadsanmartin
Tags: conservation, lagrangian, mechanic, theorem
Share this thread:
Jul9-13, 03:54 PM
P: 4
Iím not very good with english, it isnít my native language...., but Iím going to explain my question....

Iím reading the first book of Landau's series ,itís about clasical mechanics.
In the second chapter you can find a problem about the conservation's theorem

the problem says The first problem says:

Find the ratio of the times in the same path for particles having different masses but the same potential energy.

the solution is: t'/t=sqrt(m'/m)

My tentative solution is supposing that the lagrangian for both paths are the same...






BUT, Itís that correct?

and why the lagrangians are the same??? Iím not sure about the real concept (or meaning) of the lagrangian of a system...

Phys.Org News Partner Physics news on
Symphony of nanoplasmonic and optical resonators produces laser-like light emission
Do we live in a 2-D hologram? New Fermilab experiment will test the nature of the universe
Duality principle is 'safe and sound': Researchers clear up apparent violation of wave-particle duality
Jul11-13, 06:02 PM
P: 887
It would be helpful if you posted the problem since we don't all have a copy of Landau. Maybe this should be in the homework help section.

Register to reply

Related Discussions
Another question on Lagrangians (sorry) Classical Physics 8
If integral equals zero, then function equals zero Calculus & Beyond Homework 17
Del dot E equals 0 and Del dot B equals 0, both in a vacuum Classical Physics 24