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**1. Homework Statement**

http://s284.photobucket.com/albums/ll12/toluun/?action=view¤t=IMAG0004.jpg

Here is a picture of the problem at hand. I know how to solve the problem however the only thing I don't understand is the relationship between A and B. This means that if A moves to the right 1ft how far will B move downward?

**2. Homework Equations**

I know how to solve the problem however the only thing I don't understand is the relationship between A and B. This means that if A moves to the right 1ft how far will B move downward?

**3. The Attempt at a Solution**

I first tried thinking that if A moved 1 ft to the right the change in B would be the length of the rope covered. So Xb(change in mass b)= Xa/cos(30).

However this is incorrect I have the solution and the relationship is Xb = Xa * cos(30)

can anyone explain this?