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Homework Help: Simple wavelength question?

  1. Jan 8, 2012 #1
    1. The problem statement, all variables and given/known data

    A 6m length of rope has a mass of 7kg. It is pulled taut with a force of 140 N. What is the speed of the wave for the rope?

    2. Relevant equations

    i have no idea...
    v=λf
    L=λ/2

    3. The attempt at a solution
    I have no idea if I have the right formulas....
     
  2. jcsd
  3. Jan 8, 2012 #2

    NascentOxygen

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    Staff: Mentor

    Can you post the full question? In summarizing the details from your text book, you have omitted essential information.
     
  4. Jan 8, 2012 #3
    That is the whole question... I may have missed some formulas during class however.
     
  5. Jan 8, 2012 #4
    There is an equation for the speed of a wave along a stretched string. It involves tension and mass information.......have you met this equation?
     
  6. Jan 8, 2012 #5

    NascentOxygen

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    Staff: Mentor

    Thanks to technician we call fill in what we have missed (or forgotten). :cool:

    This article will fill in the gaps. http://www.sparknotes.com/testprep/books/sat2/physics/chapter17section3.rhtml
     
  7. Jan 8, 2012 #6
    Yeah I kept on using that equation but it din't work. I realized at about 4am that it was actually .7kg...
     
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