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-   -   Energy storage (http://www.physicsforums.com/showthread.php?t=300017)

superwolf Mar15-09 09:25 PM

Energy storage
 
1. The problem statement, all variables and given/known data

http://i43.tinypic.com/xq9ern.jpg
http://i39.tinypic.com/15nrlly.jpg

2. The attempt at a solution

a) [tex]d = \frac{f-f_1}{k}[/tex]

[tex]d = (f-f_1)d = \frac{(f-f_1)^2}{k}[/tex]

Correct?

b) Useful work at max. when [tex]f_1=0[/tex]; [tex]Work = \frac{f^2}{k}[/tex]

Hm...What's wrong here?


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