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Featured Article
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What else happened today
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- Today is Armed Forces Day in both Greece and Bangladesh.
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Food for thought
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A system of licensing and registration is the perfect device to deny gun ownership to the bourgeoisie. - Vladimir Ilyich Lenin
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Did you know?
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- Tikka (and Sako) are now owned by Beretta.
- From 1964 until 1967 Winchester sacrificed quality to maintain low pricing and buyers began using the phrase "pre 64" to describe the better made and therefore more desireable Winchesters.
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Latest duscussions
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Article Of The Moment
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A Shadowgraph image of a supersonic bullet. The Bow Shockwave is clearly visible as the V-shaped line at the front-most tip of the bullet (far right). A bullet bow shockwave is a physical and audible wave created in the air when a bullet travels at supersonic speeds; meaning faster than the speed of sound.
The bullet bow shockwave is the result of air being greatly compressed at the front-most tip of the bullet as it slices through the air. As the bullet moves forward a broadening wave of compressed air trails out diagonally from the bullet tip. The sides of the bullet create a conical waveform. This conical waveform may be audible to a witness as a whip-crack sound.
A bullet bow shockwave will be heard by any witness as long as the bullet speed is faster than the speed of sound, whether the bullet was fired from a weapon giving off an openly audible muzzle blast, or a mechanically-suppress-fired muzzle (silenced weapon) blast. If a bullet is fired from a silenced weapon, a witness can mistake the bullet bow audible shockwave whip-crack for the weapon muzzle blast audible wave, which is a separate audible event. It might be noted here that if one is involved in such an event, that the sound you hear from a silenced weapon will not be from the point of origin. Most humans will perceive the sound as being omnidirectional or as emanating from the bullet as it passes by.
[edit] In History
- This phenomenon may be of primary importance in the "grassy knoll" theory of the Kennedy Assassination.
[edit] In fiction
- This effect was visualized in several bullet time scenes in "The Matrix" Trilogy.
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