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Wave speed in brass wire

  • Thread starter asz304
  • Start date
  • #1
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Homework Statement



What is the wave speed in a brass wire with a radius of 3.35×10-4 m stretched with a tension of 120 N? The density of brass is 8.60×103 kg/m^3.

Homework Equations



v = sqrt( T/ mu )

The Attempt at a Solution



I have no clue about this problem. It gives me regular density but i need linear density in order for the formula to work and i don't know how or if i even can convert reg density to linear. Nor can i find any other relevant equations that would clear it up for me.

Thanks
 

Answers and Replies

  • #2
tiny-tim
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Homework Helper
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hi asz304! :wink:
It gives me regular density but i need linear density in order for the formula to work and i don't know how or if i even can convert reg density to linear.
easy-peasy …

linear density = mass per metre,

sooo … find the mass of a metre! :smile:
 
  • #3
108
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So the mass is just 8,600 kg?

And what will the length be? the radius?

Thanks
 
  • #4
tiny-tim
Science Advisor
Homework Helper
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nooo :rolleyes:

what does a metre of this particular wire look like?
 
  • #5
108
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I got it!

Since you said mass of a meter, I used the cylinder formula

V= pi*r^2*h

the height is 1 m, which gives me volume. Then I used density*volume = mass, and I get 0.0154 kg to use in v = sqrt( T*L/m ).

Thanks!
 

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