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#31
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Saturn V noise level at launch
"Ami Silberman" wrote in message ... What is it with you and Czar Bomba? Is it the answer to everything? No, but 42 of them would be :-) |
#32
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Saturn V noise level at launch
Neil Gerace wrote: What is it with you and Czar Bomba? Is it the answer to everything? No, but 42 of them would be :-) 42 of them.... IN CUBA! Hah-ha-ha-ha-ha-ha-ha! Krushie |
#33
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Saturn V noise level at launch
Neil Gerace wrote: That sounds better If the power figure is an average, then the time it takes for that energy to be released (Pat would prefer I said 'liberated', I think) is: energy / power = time lessee, giga=9, tera=12 ... 240 x 10^15 J / 5.3 x 10^24 W = 45 nanoseconds. They've got the figure in Wikipedia as 39 nanoseconds: http://en.wikipedia.org/wiki/Czar_Bomba "Since 50 Mt is 2.1×1017 joules, the average power produced during the entire fission-fusion process, lasting around 3.9×10-8 seconds or 39 nanoseconds, was a power of about 5.3×1024 watts or 5.3 yottawatts. This is equivalent to approximately 1% of the energy output of the Sun during the same fraction of a second." So you are both in quite close agreement. Pat |
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Saturn V noise level at launch
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#36
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Saturn V noise level at launch
In article .com,
says... Getting back to the original thread (sort of), I've always liked the benchmark of 194dB-SPL as the loudest *undistorted* sinusoid at sea level - complete modulation of atmospheric pressure. Never heard that one before. References? -- Kevin Willoughby lid What gets measured gets done. -- David Patterson |
#37
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Saturn V noise level at launch
On Fri, 29 Sep 2006 14:33:54 -0500, Pat Flannery
wrote: Ami Silberman wrote: What is it with you and Czar Bomba? Is it the answer to everything? What is the loudest noise? Czar Bomba! What is the biggest bang? Czar Bomba! How can we make more tea? Use Czar Bomba to turn lake Aral into world's largest open air samovar! Comrade Flannery there are rumors running around that you have the nuclear hots so bad that you want to be Czarina Bomba. Comrade A. Silberman, your attitude has been noted! Now stand a little closer to the vase where the red flowers bloom, so that the wire recording for your trial will be more clear, as will your treachery! Czar Bomba IS Communism! Czar Bomba is completely classless in who it kills, like Khrushchev's shoe descending on roaches and butterflies alike! Whack, whack, whack! All die now! BOOM, BOOM, BOOM! All fry now! Is like great iron turd ready to fall on heads of capitalist miscreants!: http://upload.wikimedia.org/wikipedi...1/Tsarbomb.jpg Here is film of Commie Cloudbuster in action!: http://www.youtube.com/watch?v=NiyUSv2Z07A "Big Ivan" seems to say: "I am purely atheistic - WORSHIP ME!" Is very basis of dialectics. Patsky I just watched the you tube clip and noticed one thing that was strange. At about the 4min 30sec point of the clip they were showing what was most likely ground radar screens, the sweep kept jumping on the screens, it would sweep about two thirds of the screen then go blank and sweep an opposite two thirds of the screen (best discription I can give). Was this how Soviet radar was displayed or had some editing happened? Seagull |
#38
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Saturn V noise level at launch
kevin willoughby wrote:
In article .com, says... Getting back to the original thread (sort of), I've always liked the benchmark of 194dB-SPL as the loudest *undistorted* sinusoid at sea level - complete modulation of atmospheric pressure. Never heard that one before. References? It's when the amplitude of the pressure wave is equal to the atmospheric pressure which means that the total pressure (atmospheric + sound pressure) varies between 2 atm and 0 atm. Since you can't have negative total pressure, this is considered to be the loudest (undistorted) sound possible. See http://en.wikipedia.org/wiki/Decibel#Acoustics. Tomas -- Tomas Lundberg | The most exciting phrase to hear in science, the Ericsson AB | one that heralds new discoveries, is not `Heureka!' Luleå | but `That's funny...' Sweden | Isaac Asimov |
#39
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Saturn V noise level at launch
kevin willoughby wrote: In article .com, says... Getting back to the original thread (sort of), I've always liked the benchmark of 194dB-SPL as the loudest *undistorted* sinusoid at sea level - complete modulation of atmospheric pressure. Never heard that one before. References? I recall it from a class exercise in the usefulness of the decibel for describing things logarithmic: the difference between 101kilopascals and 20 micropascals is only 194 dB. 20*LOG(101,000 / 0.00002) = 194.07 dB The idea is that the negative peak of the sinusoid is zero atmospheres, the positive is two atmospheres. Any louder and the atmosphere goes into clipping on the negative peaks, so there can be "louder" sounds, but they won't be pure sinusiods. References: Davis & Davis, Sound Sytem Engineering gives the same quick derivation. Years later, it strikes me that we should be using the RMS pressure when talking dB-SPL: 0.707 * 101,000 = 71,407 Pa for a sine. 20*LOG(71,407 / 0.00002) = 191.05 dB So if you really want to get loud, you pack your stereo into a hyperbaric chamber . . . . . . Jake |
#40
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Saturn V noise level at launch
Seagull wrote: I just watched the you tube clip and noticed one thing that was strange. At about the 4min 30sec point of the clip they were showing what was most likely ground radar screens, the sweep kept jumping on the screens, it would sweep about two thirds of the screen then go blank and sweep an opposite two thirds of the screen (best discription I can give). Was this how Soviet radar was displayed or had some editing happened? It's got me baffled also; it could be a radar that scans a wide area to detect its target, then scans the pie-slice of sky it's in in more detail to get a finer lock on it. It sure does seem to be hopping all over the place though. Another possibility is that the radar is using two antennas- one determining direction to the target and its range from the station with a antenna that moves horizontally; the other determining its altitude and slant range by using a antenna that oscillates up and down, and both sets of data are being displayed on the screen. Some of their SAM radars worked like that. The Soviets did have some strange looking radars, including this one that can scan two directions at once: http://images.google.com/images?q=tb...ic/pic9011.jpg Pat |
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