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Re: Re: Re: Re: O/T for you science buffs
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Posted by Steve - IN on November 08, 2003 at 09:48:56 from (12.222.30.13):
In Reply to: Re: Re: Re: O/T for you science buffs posted by RAB on November 08, 2003 at 01:02:05:
RAB, The moon does have gravity and it does have an atmosphere. The Apollo program identified helium and argon atoms there, and Earth-based observations added sodium and potassium ions to the list in 1988. Promise it's true, look it up. Only space with zero gravity will never attract an atmosphere -- therefore in any natural, non-artifical, state; the 0 atmosphere assumption must be accompanied by 0 gravity -- and the whole thought exercise becomes tautological, as the bullet would never fall. Just for fun and games, though, let's say that the slight moon atmosphere has near zero effect, and that there is enough earth oxygen stored to light the powder in the shell. Fire the rifle and measure its speed as it leaves the muzzle versus its speed when it returns to the moon's surface. Use a fudge factor of about .2 to account for the difference between Earth and Moon gravity. Run the numbers and I think you'll find the muzzle speed is about 10 times greater than its speed when it hits the moon -- proving the original statement wrong -- the force of gunpowder is greater over the same time and space than the force of earth or moon gravity. So rockets do fly, and you can get to the moon. Now leave the moon, and go to Jupiter. Do the same experiment with the same rifle, knowing that Jupiter has over 300 times the gravity of earth. The round barely leaves the tube and the science teacher is happy to have found a place where gravity is stronger than earthbound sized gunpowder rounds.
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