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Homework Help: Spring Scale Help

  1. Mar 11, 2010 #1
    If you stand on a bathroom scale, the spring inside the scale compresses 0.50 mm, and it tells you your weight is 740 N. Now if you jump on the scale from a height of 1.2 m, what does the scale read at its peak?


    I'm guessing you use 1/2kx^2 but otherwise, I'm not sure.
     
  2. jcsd
  3. Mar 11, 2010 #2

    tiny-tim

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    Welcome to PF!

    Hi fender5791! Welcome to PF! :smile:

    (try using the X2 tag just above the Reply box :wink:)
    ok, so what is the value of k? :smile:

    (and yes, you can use 1/2 kx2 later)
     
  4. Mar 11, 2010 #3
    So would k be (740N)/(.0005m) = 1.48x10^6 N/m?
     
  5. Mar 11, 2010 #4

    tiny-tim

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    Yup! :biggrin:

    Now use KE + PE = constant.​
     
  6. Mar 11, 2010 #5
    Got it, thanks.
     
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