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Forums › Off topic › Physics homework for 16yr old
beenz

644 posts

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#229131 8-Feb-2018 21:30
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So any of you good at physics out there.

 

My 16 year old has asked me for help with his homework which is WAY over my head :)

 

 

 

So this is is it.....can you explain as well so we can both understand

 

 

 

Ep=1/2 Kx2 .......the two should be above the x as in squared

 

 

 

Use the equation to find K were Ep = 398J x=0.045m

 

 

 

Thanks

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scherfie
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  #1953904 8-Feb-2018 21:57
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So you need to isolate K:

 

1) Multiply both sides of the equation by 2: 2Ep=Kx(squared)

 

2) Divide both sides of the equation by x(squared): 2Ep/x(squared) = K

 

3) K = 2Ep/x(squared)

 

3) K = (2x 398J)/(0.045m)(squared)

 

4) K = 796 / 0.002025 (in units of J/m(squared))

 

5) K = 393086 J/m(squared)

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