- #1

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## Homework Statement

http://img13.imageshack.us/img13/88/fluxm.th.jpg [Broken]

## Homework Equations

## The Attempt at a Solution

I am having difficulties to work this problem out. I know the formula is :

http://img13.imageshack.us/img13/4883/formmix.th.jpg [Broken]

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