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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 08:17:10 from (12.222.30.13):
In Reply to: Re: Re: Re: O/T for you science buffs posted by rhud on November 07, 2003 at 23:49:18:
rhud, No leg pulling involved. The statement on the first post was: "then fall back to the ground, reaching the same speed as when it left the barrel." The descending bullet, like the Apollo with no rocket burn, is propelled by gravity alone. The ascending bullet, like the Apollo with a rocket burn, is propelled by a force far greater than Earth gravity. Vacuum or atmosphere, the ascending bullet initially travels faster than the maximum speed of the descending bullet. Newton's 2nd and 3rd laws hold true. Read down a few posts - I calculated the speed differential between the initial upward velocity and the final downward velocity as about 10:1 using Galileo's basic 32 ft per second per second time relative constant acceleration rate for the downward speed, using 4800 ft as max altitude and holding wind resistance at zero, as in a vacuum. Galileo was disproving Aristotle in Pisa. Aristotle had said gravity was a differential force relative to weight. Galileo showed that the distance a body has fallen at any instant is proportional to the square of the time spent falling proving that all bodies fall with the same constant acceleration regardless of weight. Galileo's fabled lead and ebony balls actually hit at slightly different times because of Newton's 2nd law that acceleration is inversely proportional to mass. Move to Einstein and you find a link to the above gravity and mass problems in E=mc* which explains the paradox of how light behaves in relation to gravity and its mass. Light has no "resting mass", but does have motion, and can be bent by gravity, therefore it must have some kind of mass. On your Virginia roads, we've neglected to note that E=mc* dictates that light speed causes an increase in mass. Einstein argued that the laws of physics in a laboratory under uniform gravity are identical to those in a laboratory undergoing an acceleration, and thereby developed the idea of gravitation as spacetime curvature. He found that the gravitational field, like the electric field, should also have mass. Gravity, too, will be a source of gravity; distorted space contributes to its own further distortion. Einstein reached his new theory of gravitation -- his general theory of relativity - in which gravity is a spacetime distortion. Yet he never did develop a unified theory, as gravity is not integrated with electricity, nor is the weak force and the strong force fully explained. So our children must know that we don't understand how the electricity in our neurons will behave in that lightspeed spaceship - and therefore cannot answer the question. Thanks for picking up on that question I left and giving me the opportunity to talk about what Einstein and Stephen Hawking, et cetera don't know.
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