Waves frequency

  • #1
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Homework Statement



One end of a string of mass 1.45 g and length 50.0 cm is attached to a frequency generator and the other end to a weight holder which hangs over a fixed pulley . The part of the string between the generator and the pulley is horizontal . THe string is set to vibrate . Several weights are added until a fundamental frequency of 120 Hz is achieved . Calculate the tension in the string when the fundamental frequency is achieved .

Homework Equations





The Attempt at a Solution



f=v/2L

120=v/(2 x0.05)

v=120 m/s

not really sure whether this is even an attempt . I do not know how to link the v i got here to tension in the string .
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
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Try to find the relation between tension, mass per unit length and the velocity of the wave in the stretched string.
 
  • #3
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Try to find the relation between tension, mass per unit length and the velocity of the wave in the stretched string.

i am not sure how to relate them since the unit of tension is kgm/s^2 , mass per unit length is kg/m and velocity , m/s

how can i combine m/s and kg/m to get kgm/s^2 ?
 
  • #4
rl.bhat
Homework Helper
4,433
8
i am not sure how to relate them since the unit of tension is kgm/s^2 , mass per unit length is kg/m and velocity , m/s

how can i combine m/s and kg/m to get kgm/s^2 ?

What is the value of
[tex]\sqrt{\frac{kgm/s^2}{kg/m} = ?}[/tex]
 

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