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| Tags: arithmetical, derivation, light, measurement, speed |
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#1
June 17th 07
posted to sci.physics.relativity
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speed of light, measurement or arithmetical derivation?
they say that tha speed of light is 299.792.458 m/s in vacuum
but i never saw a 299.792.458 m/s tube of vaccum 
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#2
June 17th 07
posted to sci.physics.relativity
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speed of light, measurement or arithmetical derivation?
On Jun 16, 7:45 pm, enrico wrote:
they say that tha speed of light is 299.792.458 m/s in vacuum but i never saw a 299.792.458 m/s tube of vaccum The device is quite large and expensive. It is kept in deep space far from thieves and vandals and prying eyes like yours. It is even secure from your average diaper wearing astronaut. Special security clearance is requied just to look at it. http://en.wikipedia.org/wiki/Speed_o..._by_definition Sue...
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#3
June 17th 07
posted to sci.physics.relativity
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speed of light, measurement or arithmetical derivation?
enrico wrote:
they say that tha speed of light is 299.792.458 m/s in vacuum but i never saw a 299.792.458 m/s tube of vaccum Even though a perfect vacuum is idealized (even in space there is 1 molecule per m^3), a vacuum can be sufficiently approximated. Since by experiment the speed of light never changes for any (approximate) vacuum, NIST has defined the meter on the fact that the speed of light is exactly c = 299'792.458 km/s Source = http://physics.nist.gov/cuu/Units/meter.html and others -- // The TimeLord says: // Pogo 2.0 = We have met the aliens, and they are us!
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#4
June 17th 07
posted to sci.physics.relativity
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speed of light, measurement or arithmetical derivation?
On Jun 16, 6:45 pm, enrico wrote:
they say that tha speed of light is 299.792.458 m/s in vacuum but i never saw a 299.792.458 m/s tube of vaccum It never saw you either. Why are you trying to hide?
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#5
June 19th 07
posted to sci.physics.relativity
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speed of light, measurement or arithmetical derivation?
On Jun 16, 5:45 pm, enrico wrote:
they say that tha speed of light is 299.792.458 m/s in vacuum but i never saw a 299.792.458 m/s tube of vaccum Interestingly, when a police officer measures you driving at 72 mph in a school zone, the school zone does not have to be a mile long either.
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#6
June 19th 07
posted to sci.physics.relativity
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speed of light, measurement or arithmetical derivation?
On Jun 19, 6:29 am, PD wrote:
On Jun 16, 5:45 pm, enrico wrote: they say that tha speed of light is 299.792.458 m/s in vacuum but i never saw a 299.792.458 m/s tube of vaccum Interestingly, when a police officer measures you driving at 72 mph in a school zone, the school zone does not have to be a mile long either. It's like that old Steven Wright joke. He was pulled over by a cop and informed that the speed limit was only 40 miles per hour. He said that's all right, I wasn't planning on being out that long.
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