1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Analyzing a wave

  1. Sep 2, 2007 #1
    1. The problem statement, all variables and given/known data



    2. Relevant equations

    V(string) = √(Tension of string/μ), where μ = denisty

    D(x,t) = A sin (kx - ωt + Φ)

    3. The attempt at a solution

    I found the maximum displacement as 2, found from the given equation

    The third part seemed to be the next simplest, so using v=ω/k, I calculated 638/12.57 as the speed, which was incorrect

    To my knowledge, this speed is needed to calculate the tension of part 1
  2. jcsd
  3. Sep 2, 2007 #2


    User Avatar

    Staff: Mentor

  4. Sep 2, 2007 #3
    i guess it is possible, but that is the exact question copied word-for-word
  5. Sep 2, 2007 #4
    what does d(D(x,y))/dt means?
  6. Sep 23, 2007 #5
    I just realized that the third part is not required to complete the first part,

    using v=ω/k, and plugging this v into

    V(string) = √(Tension of string/μ), where μ = denisty;

    I get an answer of 12880.7, which is essentially 12.9 *103....the answer however is simply 12.9....

    where am i going wrong?

  7. Sep 23, 2007 #6
    I thought it had to do with the amplitude being in centimeters, so I divided by 100, but that still is 129 not 12.9...
  8. Sep 23, 2007 #7


    User Avatar

    Staff: Mentor

    Make sure all units are consistent. The linear mass density is 5 g/ m as opposed to 0.05 g /cm or 0.005 kg/m. Perhaps that is where one is off by 3 or 1 order of magnitude depending on the values one uses. Tension should be in Newtons (for SI/mks).
    Last edited: Sep 23, 2007
  9. Sep 23, 2007 #8
    thanks!, makes sense
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Analyzing a wave