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Doppler Effect Question. Please help !

  1. Jun 3, 2009 #1
    1. The problem statement, all variables and given/known data

    A loud speaker is connected to a string (spring constant k = N/m). The speaker moves back and forward in simple harmonic motion with an Amplitude of 0.8m. The frequency of an oscillation for amass on a string is w = (k/m)^1/2. The mass of the speaker is 90.0g.

    What is the maximum speed of the speaker in m/s?

    2. Relevant equations

    Not sure which is the relevant in this situation.

    3. The attempt at a solution

    I found the value of w = 10.54.., however I'm not sure where to go from there. Thinking about this all week but cant work it out. The answer is 8.43m/s but how I should get this im not sure. Any help would be really appreciated. Thanks
  2. jcsd
  3. Jun 3, 2009 #2


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    Homework Helper

    Welcome to PF!

    Hi mark051! Welcome to PF! :smile:

    (have a square-root: √ and an omega: ω :wink:)

    The sine (or cosine) equation will give you the position of the end of the spring …

    then differentiate it to give the velocity! :wink:
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