- #1

elevenb

- 35

- 1

## Homework Statement

http://books.google.co.uk/books?id=...ilibrium length&pg=PA136#v=onepage&q&f=false

## Homework Equations

All in the link.

## The Attempt at a Solution

The solution is there, its to do with part (c), I would really appreciate it if someone would explain how they make the jumps - especially to the second last equation