- #1

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## Homework Statement

How much energy can be stored in a spring with k = 400N/m if the maximum possible stretch is 12cm?

## Homework Equations

U = 1/2k(x^2)

## The Attempt at a Solution

I tried using the above equation. U = 1/2(400)(.12^2) = 2.88.

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- #1

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How much energy can be stored in a spring with k = 400N/m if the maximum possible stretch is 12cm?

U = 1/2k(x^2)

I tried using the above equation. U = 1/2(400)(.12^2) = 2.88.

- #2

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This looks correct, what's your question exactly?

- #3

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

- #4

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- #5

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

- #6

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what units should you use for the stored energy? (You left them out).Well I tried the answer, and it was wrong. I don't know what other equation I would use.

- #7

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

- #8

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OK try 2.88J or 2.9J (I'm not good at significant figures) and see if the computer buys it.It would be (N/m)(m^2) = Nm = J

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- #10

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Yes, I think you're right, webassign gets very picky.

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- #12

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Great, just when I learn how to do significant figures, the computer wasn't looking for 'em. That figures!

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