|MadSci Network: Physics|
I am sorry that I have been unable to find out what a DST is. Unfortunately, when you perform a search for DST on a web search engine you get hundreds of hits, but DST is a very common acronym, and I could not find anything about a reactionless drive mechanism. If you search for reactionless drives you do find some web sites that refer to things that sound like the DST you refer to. Web sites to check out are: http://www.open.org/davidc/ http://www.spacedrives.org/ I looked at these and could not figure out how they were supposed to work. I very much doubt that Newton’s third law would be violated by any of these devices. These devices seem to be ordinary mechanisms that involve complex rotating parts Conservation of momentum is very well tested. In order for such a fundamental law to be broken you would probably need to have conditions that were very extreme in some respect. For instance, at very high energies the laws of physics that we know may be shown to be incomplete. Every know and then are entire view of what is possible changes. Einstein was able to show that our basic concepts of space and time fell apart when relative velocites got to be comparable to c, the speed of light. However, for velocities small compared to the speed of light, the special relativistic effects of Einstein are very small, and Newton’s laws of motion are very nearly exact. When velocities are not limited to being small compared to the speed of light, Einstein’s generalization of Newton’s laws still require conservation of momentum. So while it may be that momentum is not always conserved, it certainly appears that in the corner of the universe we inhabit, with the energies that are accesible to us, and with the four fundamental forces that we have found, momentum is conserved. I hope this has been of some help.
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