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Strain of a Cable

  1. Apr 4, 2009 #1
    A 10-m long cable has a "No Hippos in the Pool" sign weighing 25-N suspended from the middle of the cable. The cable stretches by 2.5 cm. What is the strain in the cable?

    I know strain is ΔL/L0, but don't really know how that plays out in this scenario. If you could give me the first step or so, that'd be great!
  2. jcsd
  3. Apr 4, 2009 #2


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    ΔL/Lo is strain, so it looks to me like that's all you need to do.

    Strain is a measure of geometrical deformation right?
  4. Apr 4, 2009 #3
    Well, my problem is more how I find L than how to find strain I guess.
  5. Apr 4, 2009 #4


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    It's not 10m ?
  6. Apr 4, 2009 #5
    Draw a FBD showing the sagging cable and do a bit of geometry.
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