A traveling wave on an infinite string, find the intensity

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Homework Help Overview

The discussion revolves around calculating the intensity of a traveling wave on an infinite string, with participants attempting to clarify their understanding of the relevant equations and concepts involved in wave mechanics.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants are discussing the formula for power in terms of wave parameters and questioning the correctness of their calculations. There are inquiries about the derivation of wavelength and the relationship between different physical quantities like density, amplitude, and speed.

Discussion Status

Some participants have offered corrections regarding units and have requested to see the original calculations to better understand the errors. There is an ongoing exploration of the equations and their applications, with no clear consensus reached yet.

Contextual Notes

There are indications of potential misunderstandings regarding units of measurement, particularly the distinction between power (Watts) and frequency (Hz). Additionally, there are references to specific equations that may contain errors, which are under scrutiny.

LCSphysicist
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Homework Statement
I will post below.
Relevant Equations
.
1598913360062.png

The answer is about 40 Watts, but i am really not getting it:
<Pot> = 0.5((pλ)(ωA)²)v

p density linar
λ wavelength
ω angular frequency
A amplitude
v phase speed

Why is this wrong?

(I already tried too by <Pot> = Z*(ωA)²/2)

Z is impedance
 

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LCSphysicist said:
The answer is about 40 Hz
Hz is not a unit of power. Did you mean Watts?
 
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berkeman said:
Hz is not a unit of power. Did you mean Watts?
Opsss, yes >.< i wrote wrong
 
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The Relevant Equations: has an error.
It shows '1 lb = 3[/color][/color]54 gm-wt', it should be 4[/color]54 gm-wt.[/color][/color][/color][/color]
 
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LCSphysicist said:
i am really not getting it:
Where is your working? How did you find the wavelength?
We cannot say what is wrong without seeing what you did.
 
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haruspex said:
Where is your working? How did you find the wavelength?
We cannot say what is wrong without seeing what you did.
v = √T/ρ = λ*f is what i am using to find the speed
 

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