Tension, pulse, and time

  • Thread starter astro_kat
  • Start date
  • #1
28
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Homework Statement


a cord of mass 0.65 Kg is stretched between two supports 28 m apart, The tension of the cord is 150 N, how long will it take a pulse to go from one end to the other?


Homework Equations


ok, so I really know is: speed of wave=frequency*wavelength....


The Attempt at a Solution


I really have no clue, I know the distance, with the speed I can solve for frequency, but I don't know how to find time elapsed.... can anyone help me, I have no clue how to use tension in this problem!
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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the speed of a wave traveling through the string would be

[tex]v=\sqrt{\frac{T}{\mu}}[/tex]

where [itex]\mu[/itex] is the mass per unit length
 
  • #3
28
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oh, cool, yeah i remember seeing that equation somewhere before... right so:
v= (150/(0.65Kg/28m))^.5

take that number, given the length of the cord I can solve for time
 
  • #4
rock.freak667
Homework Helper
6,230
31
That should work,yes
 

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