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| The Bar For non Automotive Related Chat |
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13-10-2007, 11:35 PM
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#1 | ||
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LOW AND SLOW
Join Date: Sep 2006
Location: Geelong.
Posts: 2,644
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Hi all, does anyone know the exact speed of sound. The info i have found gives me 1223km/h, 1235km/h and 1238km/h. I want to know the exact speed. Thanks in advance.
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13-10-2007, 11:37 PM
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#2 | ||
Join Date: Dec 2004
Posts: 9,292
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the speed of sound is not an exact measurement.
it is dependant on atmoshphere, air pressure, humidity and numerous other factors. http://hyperphysics.phy-astr.gsu.edu...nd/souspe.html http://www.centennialofflight.gov/es...rrier/DI94.htm http://www.mathpages.com/home/kmath109/kmath109.htm |
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13-10-2007, 11:38 PM
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#3 | ||
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Performance moderator
 
Join Date: Feb 2005
Location: St Clair..N.S.W
Posts: 14,875
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very fast!!! Mach 1 ....From memory 760 mph....
__________________
Real cars are not driven by front wheels,real cars lift them!!... BABYS ARE BOTTLE FED, REAL MEN GET BLOWN. Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic! Dart 330ci block turbo black pearl EBXR8 482 rwkw.. Daily driver GTE FG.. Projects http://www.fordforums.com.au/showthread.php?t=107711 http://www.fordforums.com.au/showthr...8+turbo&page=4 |
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13-10-2007, 11:47 PM
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#4 | |||
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i'm baaaack....
Join Date: Feb 2006
Location: workin on something
Posts: 4,460
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Quote:
makes you wonder why they dont race on ice... |
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14-10-2007, 12:05 AM
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#5 | ||
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Moderator
  
Join Date: Jun 2006
Location: Foothills of the Macedon Ranges
Posts: 18,525
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Speed of sound mainly varies with temperature differences. Not air pressure.
Wikipedia: Sound is a vibration that travels through an elastic medium as a wave. The speed of sound describes how much distance such a wave travels in a given amount of time. In dry air, at a temperature of 21 °C (70 °F) the speed of sound is 344 m/s (1238 km/h, or 769 mph, or 1128 ft/s). Although the term is commonly used to refer specifically to air, the speed of sound can be measured in virtually any material. The speed of sound in liquids and solids is much higher than that in air. In the Earth's atmosphere, the speed varies with atmospheric conditions; the most important factor is the temperature. Since temperature and sound speed normally decrease with increasing altitude, sound is refracted upward, away from listeners on the ground, creating an acoustic shadow at some distance from the source.[1] Air pressure has almost no effect on sound speed. It has no effect at all in an ideal gas approximation, because pressure and density both contribute to sound velocity equally, and in an ideal gas the two effects cancel out, leaving only the effect of temperature. Sound usually travels more slowly with greater altitude, due to reduced temperature, creating a negative sound speed gradient. In the stratosphere, the speed of sound increases with height due to heating within the ozone layer, producing a positive sound speed gradient. |
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16-10-2007, 07:52 AM
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#6 | ||
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Regular Member
Join Date: Sep 2007
Posts: 267
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Assume you want it for in air and km/h at your choice of temp?
Speed(km/h) = 72.18 x sqrt(Tc + 273.15). Tc = Celsius temp.... a good approximation is: Speed (km/h) = 1193 + 2.16Tc |
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16-10-2007, 09:44 AM
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#7 | ||
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Banned
 
Join Date: Dec 2004
Posts: 8,303
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The EA won't get to mach 1. Even with 2.77s it'll rev out by the 800kph mark.
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The Speed Of Sound !
Linear Mode
