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## Homework Statement

https://dl.dropbox.com/u/66988308/Capture.JPG [Broken]

## Homework Equations

V=rW

## The Attempt at a Solution

I tried to plug in the forumla , and algebras but I keep getting rc/rf as answer instead of rf/rc as the book says.

Work:

Vf=(rf)W

W=Vf/rf

W=Vc/rc

Vc/rc = Vf/rf

(Vc)(rf) = (Vf) (rc)

(Vc)(rf) / (Vf) (rc)= 1

Im not sure if this is the right track.

Thanks for any advice.

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