Einstein

I don't think typical physics books are helpful with causality violations or instant velocity, so asking here is appropriate, even though we are not being helpful. To me instant velocity suggest infinite speed = get there in zero time. Albert Einstein says that is impossible but what does he know, but a lot of extremely complex math.
One reason we don't like violations of causality is half of your 8 friends might be descendents of the grandfather killed by a time traveler. Your friends would disappear/poof. Your memories of them would likely be gone also, but you might wonder why you have only 4 friends. Neil

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neil wrote:

I don't think typical physics books are helpful with causality violations or instant velocity....

In fact, they are helpful with some of what has been discussed here, including causality, but only if you read a lot of them and work your way up to modern physics, particularly quantum electrodynamics, which is impractical for someone with a more casual interest. In addition to remembering the subject from my own education, just doing a Web search for "causality violations" turns up a lot of straight scientific papers. However, if you want to understand things at and beyond the frontiers of physics, it is actually a good idea to learn elementary physics. It is tremendously easier to think about this particular topic in general after learning the basics. Also, instantaneous velocity is actually an often used term in physics. It means the velocity of some object at a particular moment.

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Thanks Brandon. That explains instantaneous velocity. Dr Edwards hopes to use an electrodynamic motor to get the space elevator to GEO orbit and beyond. Have you any idea how that relates to quantum electrodynamics? Neil

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Brandon9000 wrote:

... but why can you not buy a high school Physics book and learn about the subject that you are apparently so curious about?

With all due respect to the idea of book learning, some people learn much more from discussion than they do from reading. In my case, I find that I not only gain by asking questions but also by answering them.

Granted that I do a fair amount of research, but having a specific question to focus on, and having someone who is interested in the answer, makes it MUCH easier for me to wade through countless sources of information to find an answer. I find that I'm more motivated to learn something when there is someone else to share the knowledge with.

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neil wrote:

Thanks Brandon. That explains instantaneous velocity. Dr Edwards hopes to use an electrodynamic motor to get the space elevator to GEO orbit and beyond. Have you any idea how that relates to quantum electrodynamics? Neil

I wouldn't think that it would. Typically, though, causality violations, which you had referred to, arise in quantum electrodynamics.

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rosborne979 wrote:

With all due respect to the idea of book learning, some people learn much more from discussion than they do from reading. In my case, I find that I not only gain by asking questions but also by answering them.

Granted that I do a fair amount of research, but having a specific question to focus on, and having someone who is interested in the answer, makes it MUCH easier for me to wade through countless sources of information to find an answer. I find that I'm more motivated to learn something when there is someone else to share the knowledge with.

Fair enough, but I would suggest that learning high school physics makes all subsequent thought and discussion of physics a lot easier and more productive, at least it did for me. It took mankind a long, long time to figure out how to frame problems in a certain way, and use nomenclature in a certain way, and it is well worth assimilating. To me, the difference between never having studied physics, and taking the high school course, is much greater than the difference between having taken only the high school course and having taken five or more courses.

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