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Waves, pulses, sound and things of that nature

  1. Sep 13, 2012 #1
    1. The problem statement, all variables and given/known data

    http://insight.ccsf.edu/file.php/4599/PDF/Exam1-Fall-2011.pdf

    2. Relevant equations
    v^2=T/μ
    κλ=2∏
    ω=2f and many more

    3. The attempt at a solution
    Starting with 1a the λ is 4/3*.015cm=.02cm since by the diagram the distance between the labeled point is 3/4 the wavelength

    Now I'm not so sure about v. I don't think the diagram is used but in the given info in the statement. v=.3cm/.00075s right

    And then the f is equal to v/λ right

    I'll get to more later. I need to finish some astronomy homework real quick lol
     
  2. jcsd
  3. Sep 13, 2012 #2
    for f may need to use displacement=2*pi*f*t or more exactly 0.3cm=2*pi*f*.00075s actually. what do you think
     
  4. Sep 13, 2012 #3
    for 1b im thinking dU/dx equals zero at (Xa,t1) and (Xb,t2). I'm still thinking about the other two. i know dy/dt=-v*dy/dx but am not certain of the values of dy/dt or dy/dx. I have a suspicion that dy/dx may be .5 at those other points.
     
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