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Natural Length of a spring

by chaotixmonjuish
Tags: length, natural, spring
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Jan23-08, 04:51 PM
P: 287
I'm having problems with the work section of my calc book. This is the problem:

If 6 J of work is needed to stretch a spring from 10 cm to 12 cm and another 10 J is needed to stretch from 12 cm to 14 cm, what is the natural length of the spring?

I set up two equations:

6 J= Kx^2/2 evaluated at 10-L and 12-L
10 J= Kx^2/2 evaluated at 12-L and 14-L

I'm not sure what to do after the mess hell of algebra, I end up with a K and an L. Do I solve for K in one equation and plug it into the other?
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Jan23-08, 05:36 PM
P: 287
I got a length of 8
Jan23-08, 05:39 PM
Sci Advisor
PF Gold
P: 39,682
If that's the easiest way to solve the two equations. Any any case, you want to eliminate K from the equations, resulting in single equation for L.

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