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Every so often, just the right combination of conditions and events occur to create an unbelievable event -- in this case an F/A-18 Hornet passing through the sound barrier. Not only were the water vapor, density and temperature just right, but there just happened to be a camera in the vicinity to capture the moment.
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www.kettering.edu/~drussell/Demos/doppler/mach1.html
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NOVA Online presents Faster Than Sound: ... It's been 50 years since test pilot Chuck Yeager broke the sound barrier. Bookmark this site to hear Yeager and others describe those early days, to discover what creates a sonic boom, or to find out about the latest attempts to beat speed records on land, water, and in the air.
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www.pbs.org/wgbh/nova/barrier/
www.pbs.org/wgbh/nova/barrier/
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Sound barrier - Wikipedia, the free encyclopedia
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In aerodynamics, the sound barrier usually refers to the point at which an aircraft moves from transonic to supersonic speed. The term came into use during World War II when a number of aircraft sta...
en.wikipedia.org/wiki/Sound_barrier
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What he had was a technically meticulous depiction of the sound barrier being broken July 7, ... Altitude, wind speed, humidity, the shape and trajectory of the plane - all of these affect the breaking of this barrier. The slightest drag or atmospheric pull on the plane shatters the vapor oval like fireworks as the plane...
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www.rense.com/general8/boom.htm
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Military aircraft routinely accelerate to speeds greater than the local sound speed. Historically, this was referred to as "breaking the sound barrier".
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hyperphysics.phy-astr.gsu.edu/Hbase/Sound/soubar.html
hyperphysics.phy-astr.gsu.edu/Hbase/Sound/soubar.html
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Breaking The Sound Barrier - IPMS Finland's special exhibit at Helsinki Model Expo 1997 ... The speed of sound depends on altitude. At sea level it is 1224 km/h and in 9100 meters' altitude 1090,8 km/h. The Earth's troposphere ends near 11000 meters, above which the speed of sound is approximately a constant 1061 km/h.
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personal.eunet.fi/pp/vmhalme/machbust.html
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Emailed images, cont.: pensacola beach florida f 18 hornet breaking the sound barrier andreas zeitler visible manifestation ... Some scientists describe it as the visible manifestation of jet aircraft "breaking the sound barrier" (or creating a "sonic boom").
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urbanlegends.about.com/library/bl_sonic_boom2.htm
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As a plane accelerates to just break the sound barrier, however, an unusual cloud might form. The origin of this cloud is still debated. A leading theory is that a drop in air pressure at the plane described by the Prandtl-Glauert Singularity occurs so that moist air condenses there to form water droplets.
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antwrp.gsfc.nasa.gov/apod/ap010221.html
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