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Is light speed attainable for space craft from Jupiter's magnetic field is a joke?

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sr241
#1
Nov8-12, 08:28 AM
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I heard that light speed is attainable for a space craft from Jupiter's magnetic field and by Lorentz force. in this concept electric charge is turned on in a space craft orbiting Jupiter and Lorentz force caused by Jupiter's high magnetic field causes space craft to rotate around Jupiter faster and faster; when light speed is attained electric charge is turned off and space craft shoots through space at light speed.

my question is this; is any velocity higher than Jupiter's escape velocity is possible to attained by the above said concept?

I strongly feel that after attaining escape velocity of Jupiter, space craft will shoot to outer space: am I correct?
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FalseVaccum89
#2
Nov8-12, 08:46 AM
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Quote Quote by sr241 View Post
I heard that light speed is attainable for a space craft from Jupiter's magnetic field and by Lorentz force. in this concept electric charge is turned on in a space craft orbiting Jupiter and Lorentz force caused by Jupiter's high magnetic field causes space craft to rotate around Jupiter faster and faster; when light speed is attained electric charge is turned off and space craft shoots through space at light speed.

my question is this; is any velocity higher than Jupiter's escape velocity is possible to attained by the above said concept?

I strongly feel that after attaining escape velocity of Jupiter, space craft will shoot to outer space: am I correct?
Bud, SR forbids *all* travel through space at or faster than the local value of C. Put another way, you can never go as fast or faster than light through a given medium.

Escape velocity from Jupiter does not equal escape velocity from the sun.
Drakkith
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Nov9-12, 11:33 AM
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Quote Quote by FalseVaccum89 View Post
Put another way, you can never go as fast or faster than light through a given medium.
Sure you can. Cherenkov radiation is a direct result of particle traveling faster than light through a medium. The key is that nothing can ever exceed c, the speed of light in a vacuum, and nothing with invariant mass can ever reach c.

FalseVaccum89
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Nov9-12, 11:54 AM
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Is light speed attainable for space craft from Jupiter's magnetic field is a joke?

Quote Quote by Drakkith View Post
Sure you can. Cherenkov radiation is a direct result of particle traveling faster than light through a medium. The key is that nothing can ever exceed c, the speed of light in a vacuum, and nothing with invariant mass can ever reach c.
Intriguing. . . Your comment spurred me to do some more digging, and it appears that virtual photons (per QFT) don't even have to travel at c over short distances.

Quote Quote by Richard Feynman
...there is also an amplitude for light to go faster (or slower) than the conventional speed of light. You found out in the last lecture that light doesn't go only in straight lines; now, you find out that it doesn't go only at the speed of light! It may surprise you that there is an amplitude for a photon to go at speeds faster or slower than the conventional speed, c."[4] These virtual photons, however, do not violate causality or special relativity, as they are not directly observable and information cannot be transmitted acausally in the theory. Feynman diagrams and virtual photons are usually interpreted not as a physical picture of what is actually taking place, but rather as a convenient calculation tool (which, in some cases, happen to involve faster-than-light velocity vectors).
Thanks for setting me straight!
Drakkith
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Nov9-12, 01:43 PM
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Quote Quote by FalseVaccum89 View Post
Intriguing. . . Your comment spurred me to do some more digging, and it appears that virtual photons (per QFT) don't even have to travel at c over short distances.
Hmmm...it may be better to leave virtual particles out of any talk of the speed of light, as things tend to get...confusing if you bring them up anywhere but the QM forum. Well, not even then, as things still get confusing.


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