Standing waves on a moving string

[d7vid]

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!

 

[Dr. Courtney]

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?

 

[person_random_normal]

dr. courtney , tell me how an oscillator would produce a wave on the string ??

 

[Dr. Courtney]

dr. courtney , tell me how an oscillator would produce a wave on the string ??

Strings tend to start vibrating if anyone of their resonance frequencies are excited. If an oscillator excites a resonant frequency, a string will vibrate, producing a wave.

 

[person_random_normal]

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 ?? !

 

[d7vid]

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 traveling in the opposite direction are "slowed down". Would we actually see 2 different frequencies or am I completely wrong?

 

[nasu]

The speed of the wave in respect to the medium (string) is not changed by the motion of the string.

 

[d7vid]

I understand that. I was talking from the point of view of an outside observer.

 

[nasu]

That point of view is irrelevant for the frequency of the standing waves.