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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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Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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