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Re: Re: Re: O/T for you science buffs
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Posted by Steve - IN on November 09, 2003 at 20:11:46 from (12.222.30.13):
In Reply to: Re: Re: O/T for you science buffs posted by Rod F. on November 09, 2003 at 17:10:12:
Rod F. The original question was: "if I was to point a gun straight up in the air and fire it, the bullet would go up, and then fall back to the ground, reaching the same speed as when it left the barrel.
Is this fact or fiction?." That's why the muzzle velocity, or the speed it was traveling when it left the barrel is important. Gotta answer the question - so you have to know the original velocity to compare it to the final velocity when it hits the dirt. A ballistics table rates the speed, force, and air friction coefficient for a particular round. The force, energy, punch, of the round is rated in foot/pounds. Torque is rated in foot pounds. As one of the themes was to draw some relation to a tractor engine -- seemed a bit interesting to throw in "torque" in a tongue in cheek sort of way instead of using the words force, energy, punch, etc. over and over ad nauseam. Yes, torque is properly a turning force - but it's easily translated to lifting force as the common currency is foot/pounds. The energy number in foot pounds already assumes a 1G gravity by telling you a 2000 ft/lb round can lift 1 pound 2000 feet, half pound 4000 feet, quarter pound 8000 feet, and so on - all ratings done on earth - and with a given amount of powder charge in the round. So the gravity correction is basiclly "built-in" with differences that are negligible. The wind resistance or drag coefficient get substantial with various shapes of bullets, though. Think that covers all your questions, yes?
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