How Long After a Crash Does Sound Reach Different Observers?

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Homework Help Overview

The problem involves determining the time it takes for sound to reach different observers after a crash, considering the speed of sound in water and air, as well as the time delay experienced by the original poster while underwater.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the speed of sound in air and its relevance to the problem. There is a focus on the relationship between time, distance, and speed of sound in different media. Questions arise regarding the unspecified distance of the crash from the observers.

Discussion Status

Some participants have provided information about the speed of sound in air and have begun to explore the implications of the time delay experienced by the original poster. There is an ongoing examination of the assumptions regarding the timing of the crash in relation to the sounds heard.

Contextual Notes

The problem lacks specific information about the distance from the crash to the observers, which is a point of uncertainty in the discussion. Additionally, the timing of the crash relative to the sound of the boat is not clearly defined.

dlre
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Homework Statement



the air temperature is 20 degree celsius. you are swimming underwater when you hear a boat noise. then 305s later, you hear a crash. if the speed of sound in wter is 1450m/s, how long after the crash does your friend on the dock beside oyu hear the crash?

Homework Equations



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The Attempt at a Solution



??
 
Physics news on Phys.org
Do you know the speed of sound in air?
 
346m/s?
 
Ok so you know the time it takes for the sound to transverse a distance in a certain medium is t = \frac{d}{{v_{medium} }}. You really don't know the "distance" because it's not actually stated in the problem that the crash occurred immediately after the boat sound is heard but you CAN determine the ratio of the time sound waves take to reach each person using the equation.
 

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