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Total mechanical work, solving for x

by Nano-Passion
Tags: mechanical, solving, work
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Nano-Passion
#1
Dec15-12, 05:32 PM
P: 1,306
1. The problem statement, all variables and given/known data

I understand the problem conceptually. I just need help solving for x, which is the hardest part of the problem for me.

1/2mv^2 = 1/2kx^2 + umgx

3. The attempt at a solution

Not really sure how to solve this. I tried and tried to separate by x but nothing worked. Here are 1 of the attempts I suppose. I feel pretty stumped here.

[tex]1/2mv^2 = 1/2kx^2 + umgx[/tex]
[tex]1/2mv^2 - umgx = 1/2kx^2[/tex]
[tex]\frac{mv^2}{k} - \frac{2umgx}{k} = x^2[/tex]
???
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gneill
#2
Dec15-12, 05:38 PM
Mentor
P: 11,618
Looks like you've got a quadratic equation in x on your hands. Sound familiar?
Nano-Passion
#3
Dec16-12, 06:47 PM
P: 1,306
Quote Quote by gneill View Post
Looks like you've got a quadratic equation in x on your hands. Sound familiar?
I thought a lot about how I couldn't expand x^2 + x.. but when you mentioned quadratic equation it came to me right now.. I'll get back to this once I get home.


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