# Homework Help: Lagrangian Mechanics

1. Jun 23, 2011

### athrun200

I don't know how to do the 4 questions.
And I only have some ideas on questions 1.
The details are written on the photos.

Thanks for help.

Eqtn 2.28 2.36 2.37 are given on the photo.

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2. Jun 24, 2011

### sgd37

you need to realize that $$F_i = \vec{F}$$ then you can derive your relations

either that or what is the meaning of the i index