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Speed of a wave on a string

  1. Jan 15, 2008 #1
    1. The problem statement, all variables and given/known data

    A steel cable, of cross-sectional area 2.79 * 10^-3 m2, is kept under a tension of 1.00 * 10^4 N. The density of steel is 7860 kg/m3 (this is not the linear density). At what speed does a transverse wave move along the cable?

    2. Relevant equations

    velocity = sqroot(T/(m/L)) m/L = linear density

    3. The attempt at a solution

    I have no idea where to start this because I do not know what to do with the area given and also how to convert the regular density to linear density. Can anyone start me off? i then would know how to solve the problem, thanks!
  2. jcsd
  3. Jan 15, 2008 #2


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    density =mass/volume and volume=Cross-sectional area*length

  4. Jan 15, 2008 #3
    thank you!
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