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Standing waves on a moving string

  1. Jul 13, 2015 #1
    Hello,
    I have the configuration as shown in attached picture. I know how to calculate string tension and measure frequency if the string is not moving. But what happens if the string is moving at a constant speed? Are there still standing waves? Can we still calculate the string tension? What if the speed of a string is slow in comparison to frequency of standing waves?

    Thanks!
     

    Attached Files:

  2. jcsd
  3. Jul 13, 2015 #2
    First, this may belong in a HW section and need to follow the HW guidance requirements.

    Second, consider why and how would the equations change if a string is moving?
     
  4. Jul 13, 2015 #3
    dr. courtney , tell me how an oscillator would produce a wave on the string ??
     
  5. Jul 13, 2015 #4
    Strings tend to start vibrating if any one of their resonance frequencies are excited. If an oscillator excites a resonant frequency, a string will vibrate, producing a wave.
     
  6. Jul 13, 2015 #5
    actually i meant to say how an oscillator would produce a wave on the string , when the string is moving with some speed ??
    don't you think that - the attempt of oscillator for producing a wave may lead to some unordered stuff happening on the string , as it is moving ?? !
     
  7. Jul 14, 2015 #6
    Sorry if it is in the wrong section.
    I was thinking that waves moving in one direction are "sped up" because of the moving string and waves travelling in the opposite direction are "slowed down". Would we actually see 2 different frequencies or am I completely wrong?
     
  8. Jul 14, 2015 #7
    The speed of the wave in respect to the medium (string) is not changed by the motion of the string.
     
  9. Jul 15, 2015 #8
    I understand that. I was talking from the point of view of an outside observer.
     
  10. Jul 15, 2015 #9
    That point of view is irrelevant for the frequency of the standing waves.
     
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