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Re: Re: O/T for you science buffs
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Posted by Steve - IN on November 07, 2003 at 17:35:07 from (12.222.30.13):
In Reply to: Re: O/T for you science buffs posted by rhudson, negating air fri on November 07, 2003 at 16:12:22:
It's not a fact. That science teacher violated Newton's 3rd law and ought to be sent to physics jail. Here's why: Consider this: Two Apollo space craft, both in the vacuum of space. Both have just slingshoted around the moon. One fires a rocket (pulled the trigger on the rifle) the other does not, and just relies upon Earth's gravity for its return. Which one gets home first? The one that fired the rocket, of course. Both have Earth's gravity pulling them, both are in a vacuum; but the rocket powered one has used Newton's 3rd -- every action results in an equal and opposite reaction --and gets home first. End of story. The speed of the rifle bullet leaving the tube against gravity is about 10 times greater than the speed of the bullet falling to Earth, propelled only by gravity. That's real simple. Also consider this: Cmdr Dave Scott, on the moon, 1971. Drops a hammer and a falcon feather at the same time. Near perfect vacuum. The feather hits a tad later than the hammer -- greater mass in the hammer. Galileo was right -- 400 years earlier. Speed of light. We leave Newton and enter Einstein territory. If E=MC squared, then at the speed of light, you're pure energy anyway, and don't see a thing. Assuming you're not pure energy, you neurons don't run faster than light speed anyway, so you don't notice any difference in anything you see from one moment to another, as everything is constant.
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