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REPORT COPYRIGHT VIOLATION IN REPLY
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Message Subject
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NASA Thrust Equation gets destroyed.
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Poster Handle
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Anonymous Coward |
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Post Content
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Your problem is that you're thinking of force.
F = ma is what Newton said. So one could conclude that with no external force, there's no acceleration. But he was wrong in the case of masses that change. That conclusion would be wrong.
Actually it's
F = dp/dt = ma + v dm/dt
so with no external force, momentum is conserved. And that's why rockets work. Because of the nonzero v dm/dt term.
Quoting: oniongrass So Newton was wrong? Do you have any evidence of this? Yeah, here are two proofs. (1) Look at any modern physics textbook that deals with rocketry. Or just look up "conservation of momentum" and see that it's considered a fundamental principle of physics. (2) Rockets work. Dude that’s not proof To prove this science to some dotards, we'd have to shoot them into space.
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