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Re: Re: Re: O/T for you science buffs
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Posted by MarkB on November 08, 2003 at 05:17:37 from (64.79.80.1):
In Reply to: Re: Re: O/T for you science buffs posted by john on November 07, 2003 at 19:40:59:
A vacuum has nothing to do with gravity. Let's say you were on the moon, which has no atmosphere. Assuming your bullet doesn't exceed the escape velocity of the moon (a very real possibility), it will decelerate until it stops and returns to the surface of the moon. When it impacts the moon's surface, it will be traveling at the same velocity as when it left the gun. What happens when you fire a projectile upwards is that the kinetic energy of the projectile is converted into potential energy. When there's no more kinetic energy left, the projectile stops, then falls to earth. As it falls, the potential energy is converted back to kinetic energy. In a vacuum, you 100 percent of the energy you started out with. On earth, a huge amount of energy is lost to air resistance, so the projectile will fall to earth much slower than its original velocity.
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