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Old Jan 26th 2010, 04:30 AM   #1
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wave

If an echo is heard one second after the holler and reflects off canyon walls which are a distance of 170 meters away,then what is the speed of the wave?
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Old Jan 26th 2010, 08:46 AM   #2
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Hi

Well, first of all I want to say question is very simple and you just need to think a little about it. If a sound wave reflect from a wall situated at a distance of 170 meters, it means it take a round trip of 170+170m for sound to return to your ear which is an echo. All this distance has been covered in 1 s so simply speed of wave is 340m per second.

You got it??????
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Old Sep 6th 2010, 10:56 PM   #3
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Right!!!

@vyomictor is right

you can think that in 1 sec it strike and come back to the same position.
It means if the walls are at 170 meters, echo traveled 170 in half sec to strike walls and come back 170 meters to the same place.

Simply it means
170+170=360m/sec

Last edited by arbolis; Sep 7th 2010 at 07:56 AM. Reason: incomplete
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Old Feb 7th 2011, 02:49 AM   #4
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In fluid dynamics, wind waves or, more precisely, wind-generated waves are surface waves that occur on the free surface of oceans, seas, lakes, rivers, and canals or even on small puddles and ponds. They usually result from the wind blowing over a vast enough stretch of fluid surface. Waves in the oceans can travel thousands of miles before reaching land. Wind waves range in size from small ripples to huge rogue waves.[1] When directly being generated and affected by the local winds, a wind wave system is called a wind sea. After the wind ceases to blow, wind waves are called swell. Or, more generally, a swell consists of wind generated waves that are not — or hardly — affected by the local wind at that time. They have been generated elsewhere, or some time ago.[2] Wind waves in the ocean are called ocean surface waves.
Tsunamis are a specific type of wave not caused by wind but by geological effects. In deep water, tsunamis are not visible because they are small in height and very long in wavelength. They may grow to devastating proportions at the coast due to reduced water depth.
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Old Feb 7th 2011, 12:07 PM   #5
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Originally Posted by Herry View Post
170+170=360m/sec
Really?

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Old May 3rd 2016, 04:53 PM   #6
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Tsunami Modelling

Can you proof equation (13) at http://basin.earth.ncu.edu.tw/downlo...20modeling.pdf



∂u/∂t+u∂u/∂x+g∂ξ/∂x+k u|u|/(2h(x))=0

∂ξ/∂t+∂/∂x [(h(x)+ξ)u]=0
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Old Jul 5th 2016, 07:53 AM   #7
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Why are there so many "responses" on this forum that have nothing to do with the original question?
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Old Jul 5th 2016, 05:20 PM   #8
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One could suggest that your post (and of course also my post) have nothing to do with the original thread...
However I think the original thread had run its course (some years ago) so I don't think we can be accused of impolitely intruding into an ongoing thread.

In an open forum, where anyone is free to post, it is (unfortunately) inevitable that there will be people who don't follow (and probably don't even read) the forum rules.
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Old Dec 27th 2017, 09:29 AM   #9
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The speed is 340 m per second. 170+170= 340. It is a simple question. If you are interested in something more complicated I would recommend https://studydaddy.com/ there you can get answers at the most challenging questions.
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Old Dec 27th 2017, 12:03 PM   #10
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At this point I have to say that I'm extremely disappointed in everyone in this forum for not following the rules in helping people. Since I don't wish to be party to doing people's home work for them I leaving permanently and as such won't be returning. The fact that nobody is willing to get rid of the spams has solidified this for me. This place such went down hill since I joined.

Good bye.
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