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Pulse wave problem

by bricker9236
Tags: pulse, speed, string, waves
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bricker9236
#1
Nov17-09, 07:50 PM
P: 10
1. The problem statement, all variables and given/known data

A string of length l = 5 m weighs M = 10 kg . A pulse wave is traveling along the string. What is the speed v of the crest of the pulse, in the uint of m/s , if the tension of the string F is 200 N ?



2. Relevant equations

v= sqrt F/u
u= m/L

HELP: We can obtain an expression for the wave speed by analyzing the forces acting a string of length l and mass M. Do you recall the resulting relation between the speed of the wave and the tension and the linear density?

HELP: ....Get the density by defination and then use above equation.


3. The attempt at a solution

I tried importing the numbers into the equation what I thought was the equation the HELP statement suggested.. and i got

v=sqrt 200/(10/15) = 17.320 ... is there something else i should be doing because this answer was wrong but i thought for sure i was doing it correct.
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kuruman
#2
Nov17-09, 09:03 PM
HW Helper
PF Gold
kuruman's Avatar
P: 3,440
The length of the string is 5 m. Where did you get 15 m?


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