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**[SOLVED] Length of Spring**

## Homework Statement

A load of weight 400 N is suspended from a spring and two cords that are attached to blocks of weights 3W and W as shown. Knowing that the constant of the spring is 800 N/m, determine (a) the value of W, (b) the unstretched length of the spring.

http://img406.imageshack.us/img406/472/13213uv7.jpg [Broken]

## Homework Equations

[tex]F_{s} = -k x[/tex]

## The Attempt at a Solution

I have already worked through part (a), getting 62.8 N for W and in the process I got 281.712 for the [tex]F_{s}[/tex] of the system above.

Now from the picture above, I can figure that the length AB is 1110 mm using Pythagoreans. Whether that is relevant or not to figuring (b) out, I am not sure. I'm thinking that I need to find what the [tex]F_{s}[/tex] would be if there were no forces acting on the spring.

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