Why Is 686 m/s Incorrect in Physics Calculations?

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Homework Help Overview

The discussion revolves around a calculation involving the speed of sound and the distance it travels over a specific time period. Participants are examining the correctness of arriving at a speed of 686 m/s in the context of sound waves and echoes.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the calculation of distance using the formula v = D/T and question the assumptions made regarding the context of the problem, particularly the relevance of the distance in relation to the sound source and the echo.

Discussion Status

The discussion is active, with participants questioning the original poster's calculations and assumptions. Some guidance has been offered regarding the importance of context in physics problems, particularly in relation to the setup involving a rocky cliff.

Contextual Notes

There is an emphasis on understanding the physical scenario rather than just performing calculations, with specific mention of the implications of facing a rocky cliff when considering sound travel.

Bruh23
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Homework Statement
You are standing at some distance from a rocky cliff and shout loudly. You hear the echo 2 seconds later. How far is the rocky cliff? Take the speed of sound in air as 343 m/s and round off your answer to the nearest integer (whole number).
Relevant Equations
v = Distance/Time
I brought time over to the other side and multiplied to get 686 m/s but that wasn't correct
 
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Show your work
 
v = D/T
v*T = D/T*T
343 m/s * 2s = D
D = 686 m
 
686 m is the distance sound travels in 2 seconds. Are you 686 m away from the point where you produced the sound when you hear the echo?
 
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You are doing math blindly, without consideration for context. There is a reason they've told you you're facing a rocky cliff.

Or, more simply: you have not actually answered the question asked. What is the question that was asked?
 
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Why the "Physics of light and sound"?
 
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nasu said:
Why the "Physics of light and sound"?
Likely the name of the chapter OP is studying.
 
1674015095339.png


Can we conclude that you figured it out?
 
nasu said:
Why the "Physics of light and sound"?
It refers to how the OP likes to dress when studying Physics. See their Avatar...

1674245512775.png
 
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