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Energy stored in a spring 
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#1
Oct3107, 09:11 PM

P: 236

1. The problem statement, all variables and given/known data
How much energy can be stored in a spring with k = 400N/m if the maximum possible stretch is 12cm? 2. Relevant equations U = 1/2k(x^2) 3. The attempt at a solution I tried using the above equation. U = 1/2(400)(.12^2) = 2.88. 


#2
Oct3107, 09:23 PM

P: 436

This looks correct, what's your question exactly?



#3
Nov107, 05:02 AM

P: 11

If I'm not mistaken, that's the energy of just one particle from the spring.



#4
Nov107, 07:41 AM

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P: 21,880

Energy stored in a spring
The mechanical energy is stored uniformly in the spring for the most part (assuming uniform material properties, e.g. elastic modulus), but that is the energy that would be imparted to any mass at the end of the spring (with respect to the other end) if the spring were released and pushed or pulled the mass.



#5
Nov107, 02:55 PM

P: 236

Well I tried the answer, and it was wrong. I don't know what other equation I would use.



#6
Nov107, 03:03 PM

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#7
Nov107, 03:20 PM

P: 236

It would be (N/m)(m^2) = Nm = J



#8
Nov107, 03:46 PM

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#9
Nov107, 04:29 PM

P: 436

As far as sig figs go, I think it should be 3 Joules. We only know the spring constant to one significant digit.



#10
Nov107, 05:38 PM

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#11
Nov207, 02:05 PM

P: 236

Holy crap everyone!! I am so sorry about this problem. I was just going to try entering 3, when I noticed that I didn't put the decimal point into my original answer. BIG difference between 288 and 2.88! Sorry again!!!!!



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