Register to reply

Pulse wave problem

by bricker9236
Tags: pulse, speed, string, waves
Share this thread:
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.
Phys.Org News Partner Science news on
Climate change increases risk of crop slowdown in next 20 years
Researcher part of team studying ways to better predict intensity of hurricanes
New molecule puts scientists a step closer to understanding hydrogen storage
Nov17-09, 09:03 PM
HW Helper
PF Gold
kuruman's Avatar
P: 3,443
The length of the string is 5 m. Where did you get 15 m?

Register to reply

Related Discussions
Pulse waves General Physics 39
Pulse train Electrical Engineering 1
Build a pulse-jet for my final year project Mechanical Engineering 6
Laser pulse General Physics 9
Pulse NMR principle... General Physics 8