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!

Isn't there anybody that can help?

  1. Nov 27, 2007 #1
    1. The problem statement, all variables and given/known data
    Power transported by a wave problem...Please Help!!!
    1. On a real string, some of the energy of a wave dissipates as the wave travels down the string. Such a situation can be described by a wave function whose amplitude A(x) depends on x: y=A(x)sin(kx-t), where A(x)=Ae. What is the power transported by the wave as a function of x, where x>0?

    2. P=vcos(kx-t)

    3. I tried two approaches, neither of which I am sure if it is the right way to solve the problem...not sure what the question is really asking for.
    so, by substituting to "simplify": P(x)=(2)(A(x))cos(kx-t)
    and I'm not sure where to go from there...if it's simplified enough for the answer or if it's the completely wrong approach.

    So those are my two answers worked out completely showing all steps. Please help and thank you.
    Also note that the greek letters look like superscripts but they aren't supposed to be.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Nov 27, 2007 #2


    User Avatar

    Staff: Mentor

    Is this supposed to be a decaying exponential? If not, then the maximum amplitude is constant as a function of position.
  4. Nov 28, 2007 #3

    Shooting Star

    User Avatar
    Homework Helper

    I am assuming that A(x) is of the form A*exp(-x/b), because you have mentioned dissipation of energy. What I want to know is whether you know how to find the power of a wave when there is no dissipation? What has been taught in the class so far? Don't use formula blindly.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Isn't there anybody that can help?