what is relativistic speed?

Answer 1

The speed at which YOU the observer are moving.
When you approach the speed of light this becomes important because to an independent observer it seems that the faster you go the more time slows and your dimension on the line of travel decreases as your mass increases. To you nothing changes, but to others it does. It all depends on your frame of reference.

This has been proven experimentally with atomic clocks on an airplane and the space shuttle. After a flight around the world the clocks in the air and space were slower than the clocks running on the ground.

ANY forward speed can be said to be approaching the speed of light; some speeds are just greater than others.

Relativistic speed is a concept developed by Einstein with his theory of Special Relativity: http://en.wikipedia.org/wiki/Introduction_to_special_relativity

Answer 2

Relativistic Speed

Answer 3

It's perceived speed seen or sensed by one person or machine when measuring another person or machine.
If you drive by me at a fast velocity, I would see you for a split second only through a narrow opening. You would also in turn see me for a split second. Yet, with such a view, who was really speeding? Either you were driving fast and I was still, or the world moved by fast and you were still. Hence the term, it's all "relative."
These perceptions are what Einstein studied, along with gravity. In time, formulas were created to help explain these "relative" situations.
Of course, most people have used "relativistic speeds" for light speed travel. Seems to me an improper use of the term.

Answer 4

It's any speed that is so fast that you need to use the equations of relativity to get an accurate answer.

For "normal" (slow) speeds, the equations of relativity give answers that are almost identical to the "classical" (pre-relativity) equations. So in "normal" cases it's considered OK to use the classical equations--which is nice, because they're easier.

But at faster speeds, you get noticeable differences between the classical equation and the relativity equations. The relativity equations give the more accurate result in that case.

So, how fast is that? Responder faesson says that relativistic speeds are 90% of c or greater, but this is way off. For example, if you traveled at "only" 1 percent of the speed of light for one day, your watch would lose 4 seconds due to the effects of relativity. So 1 percent of c would definitely be considered a relativistic speed (as would, of course, anything higher).

Answer 5

Speeds that become significant compared to the speed of light. value of the equation 1-(v²/c²) for everyday speeds is so close to 1.00000000000 that relativistic effects are not (usually) seen. But as V² (velocity squared) approaches C squared (speed of light squared ) when V= .01 of C
V²/C² = .0001 and things can begin to become relativistic.
(especially since some "special relativity" equations use √(1-v²/c²) and √(.0001) = .01
at V = .5C 1-v²/c²= 1-.25 = .75 and √0.75 ~ .85 and significant deviations from Classical Newtonian Physics will be observed.

Answer 6

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RE:
what is relativistic speed?

Answer 7

the world of motion hasn't really changed much since the days of Newton. that is, when you move slowly, its pretty hard to tell.

when you move above about 90% of the speed of light, though, relativistic effects are much easier to measure.

so anything > 90% of c is relativistic speed.

Answer 8

A speed approaching that of light.

Answer 9

Speed that approaches the speed of light.