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NASA Thrust Equation gets destroyed.
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oniongrass |
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Not sure who's trying to prove what here, but conservation of momentum applies to solids, liquids, gases, plasmas ... every state of matter. Total momentum is conserved unless an external net force is applied. That's why rockets work.
Quoting: oniongrass Fluids move due to pressure gradient force. The pressure broke apart the soda can and physically pushed it. If there is nothing to push she. The gas moves to low pressure, there is no opposite force 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. 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.
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