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05-10-2004, 01:19 PM
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#106 | | Senior Member
Join Date: Apr 2004
Posts: 250
| no way ho say
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manchester united rock engaland are gona win eruo 2004 | 
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05-10-2004, 04:58 PM
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#107 | | Konfused with a 'K'
Join Date: Jan 2004 Location: Turin, Italy
Posts: 20,412
Country:  | hmmm, fine  
__________________  with my one last gaping breath id apologise for bleeding on your shirt... | |
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05-10-2004, 06:38 PM
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#108 | | Senior Member
Join Date: Apr 2004
Posts: 12,061
Country:  | The speed of a bullet does depend on the gun, but there is little change in statistic terms, but it makes a lot of difference when it hits something. Also the size of round affects the speed, a 5.56mm round goes faster than a 7.62mm round for example.
Even with that most bullets go around, and above Mach 1, but only just. Depending on your altitude it changes what speed (mph or km/h) Mach 1 is, but it is still refered to as Mach 1 even if at sea level it is 760 mph but at 20,000 ft it is 730 mph (not the real figure).
__________________ "When you go home tomorrow, don't expect anyone to know what you have been through. Even if they did know, most people probably wouldn't care anyway. Some of you may get the medals you deserve, many more of you will not. But remember this, all of you are now members of the front-line club, and that is the most exclusive club in the world." - Lt. Col. Matthew Maer CO 1st Battalion, the Princess of Wale's Royal Regiment. Camp Abu Naji, Oct. 2004  To those in that club. | |
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05-11-2004, 08:38 AM
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#109 | | Master of Ewes
Join Date: Dec 2003
Posts: 19,959
Country: | i said it's tecnicaly impossible, you can go faster then the speed of sound if you're not making any sound, but you can't break the sound barrier, i hope that clears things up.........
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"Reminds me of the time I sank the Tirpitz" comments a Spitfire pilot, "One pass of course, old boy." | |
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05-11-2004, 11:57 AM
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#110 | | Senior Member
Join Date: Apr 2004
Posts: 2,512
| I'm not sure that's cleared anything up.
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05-11-2004, 12:04 PM
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#111 | | Konfused with a 'K'
Join Date: Jan 2004 Location: Turin, Italy
Posts: 20,412
Country: |  im just gonna keep outta this...
__________________ with my one last gaping breath id apologise for bleeding on your shirt... | |
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05-12-2004, 02:11 PM
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#112 | | Master of Ewes
Join Date: Dec 2003
Posts: 19,959
Country: | Quote: |
I'm not sure that's cleared anything up.
| how, hopefully i can shine some light on it if you don't understand, but it's pretty hard to explain................
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"Reminds me of the time I sank the Tirpitz" comments a Spitfire pilot, "One pass of course, old boy." | |
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05-12-2004, 02:13 PM
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#113 | | Senior Member
Join Date: Apr 2004
Posts: 2,512
| Well, I did some numbers crunching and 3,000 fps (a not unatainable speed for a rifle bullet) translates to somewhere around Mach 3 (depending on altitude).
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05-12-2004, 02:18 PM
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#114 | | Master of Ewes
Join Date: Dec 2003
Posts: 19,959
Country: | Mach one's about 760mph.............
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"Reminds me of the time I sank the Tirpitz" comments a Spitfire pilot, "One pass of course, old boy." | |
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05-12-2004, 02:19 PM
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#115 | | Senior Member
Join Date: Apr 2004
Posts: 2,512
| At sea level. It drops off to below 700 at altitude.
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05-12-2004, 02:20 PM
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#116 | | Master of Ewes
Join Date: Dec 2003
Posts: 19,959
Country: | it always changes at different altitudes, the speed of light doesn't however........................
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"Reminds me of the time I sank the Tirpitz" comments a Spitfire pilot, "One pass of course, old boy." | |
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05-12-2004, 02:31 PM
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#117 | | Senior Member
Join Date: Apr 2004
Posts: 12,061
Country: | Yes, the speed of sound does change at altitudes, the speed of light also changes but not with altitude (or not that I know of). The speed of a bullet at sea level goes about Mach 1.
If a person is like a mile away, shoots, and you see the flash you can avoid it (You have to be quick though, I wouldn't advise trying ). At Mach 3, you couldn't.
__________________ "When you go home tomorrow, don't expect anyone to know what you have been through. Even if they did know, most people probably wouldn't care anyway. Some of you may get the medals you deserve, many more of you will not. But remember this, all of you are now members of the front-line club, and that is the most exclusive club in the world." - Lt. Col. Matthew Maer CO 1st Battalion, the Princess of Wale's Royal Regiment. Camp Abu Naji, Oct. 2004 To those in that club. | |
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05-12-2004, 02:33 PM
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#118 | | Senior Member
Join Date: Apr 2004
Posts: 2,512
| At low altitude, a 3000fps bullet would be Mach 2.7. Which is still really fast. And according to Einstein, the speed of light is the only true constant in the universe.
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05-12-2004, 02:35 PM
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#119 | | Senior Member
Join Date: Apr 2004
Posts: 12,061
Country: | Never did Physics? Refraction ring a bell? Shine a beam of light through glass, it refracts because it slows.
__________________ "When you go home tomorrow, don't expect anyone to know what you have been through. Even if they did know, most people probably wouldn't care anyway. Some of you may get the medals you deserve, many more of you will not. But remember this, all of you are now members of the front-line club, and that is the most exclusive club in the world." - Lt. Col. Matthew Maer CO 1st Battalion, the Princess of Wale's Royal Regiment. Camp Abu Naji, Oct. 2004 To those in that club. | |
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05-12-2004, 02:44 PM
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#120 | | Senior Member
Join Date: Apr 2004
Posts: 2,512
| Actually I did a lot of physics. But you are right. But that is a change caused by medium rather than altitude. I believe that Einstein was refering to light in a vacuum but I'm mostly guessing now.
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