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Re: Re: O/T for you science buffs
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Posted by RayP(MI) on November 07, 2003 at 13:48:09 from (216.46.197.243):
In Reply to: Re: O/T for you science buffs posted by mike on November 07, 2003 at 09:45:47:
No, the science teacher is correct: The figure you're looking for is 9.8 m/sec/sec. This is approximately 32 feet/sec/sec. This represents the acceleration due to gravity here on earth. The same gravitational force works on the bullet whether it is going up or down. So, if we exclude the friction due to the fact that the bullet is traveling through an atmosphere the theory holds: The descending bullet would be traveling at the same speed as it left the muzzle, only in the opposite direction. In our world, air resistance would slow the bullet somewhat, and probably somewhere in flight, the rotational energy would diminish, and the bullet would probably begin to tumble, increasing the air resistance, and thus slowing the descent, somewhat. HOWEVER, the speed of the falling bullet would be significant, and I'm not about to attempt this experiment, not even with a hard hat on! Here's another scientific curiosity - if you fired a projectile straight upward from a MOVING vehicle, and the vehicle continued to travel at the same velocity and direction, would the falling projectile hit the vehicle? Theoretically, the answer is YES. I'm a science teacher too, and my students and I launched hobby rockets off the roof of a moving car. Came awfully close to getting hit several times. Had there not been a slight breeze, I'm sure it would have.
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