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Tension, pulse, and time

  1. Jan 15, 2008 #1
    1. The problem statement, all variables and given/known data
    a cord of mass 0.65 Kg is stretched between two supports 28 m apart, The tension of the cord is 150 N, how long will it take a pulse to go from one end to the other?


    2. Relevant equations
    ok, so I really know is: speed of wave=frequency*wavelength....


    3. The attempt at a solution
    I really have no clue, I know the distance, with the speed I can solve for frequency, but I don't know how to find time elapsed.... can anyone help me, I have no clue how to use tension in this problem!
     
  2. jcsd
  3. Jan 15, 2008 #2

    rock.freak667

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    the speed of a wave traveling through the string would be

    [tex]v=\sqrt{\frac{T}{\mu}}[/tex]

    where [itex]\mu[/itex] is the mass per unit length
     
  4. Jan 15, 2008 #3
    oh, cool, yeah i remember seeing that equation somewhere before... right so:
    v= (150/(0.65Kg/28m))^.5

    take that number, given the length of the cord I can solve for time
     
  5. Jan 15, 2008 #4

    rock.freak667

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    That should work,yes
     
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