Speed affecting time

General discussion about Celestia that doesn't fit into other forums.
Mikeydude750
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Post #21by Mikeydude750 » 28.03.2004, 21:28

adamnieman wrote:
t00fri wrote:The much harder (but feasible part) concerns the distortions of the field of view of the observer as well as the (Doppler) shifts in colors. The whole 3d geometrical structures will be distorted depending on direction and value of the observer speed. This has massive implications on the rendering of almost everything within Celestia. Another consideration is optimized coding efficiency in order to avoid slowing down effects...

If it could be done, it would be a fantastic teaching aid (as I'm sure Frank would attest). Teachers could populate a patch of empty space with trains, barns and grids (the staples of special relativity education) and let their students experience relativistic effects for themselves. Perhaps the value of the speed of light could be modified by the user to experiment with more managable values. In the Mr Tompkins books, George Gamow imagines what it would be like to cycle down the street if the speed of light was just 20mph or so.

(Barns are used in problems involving Lorentz contraction. You run, at relativistic speed, through a barn with a door at each end holding a pole that is longer than the barn itself. As soon as the end of the pole reaches the door it is opened, and as soon as the other end of the pole crosses the threshold the door is closed. For a moment from the barn's reference frame, both doors are closed simultaneously. Thus the pole, which we know is longer than the barn, fits into it 8O. When we try this from the pole's reference frame, the two doors are never simultaneously closed :wink:. )

Adam
Jesus, no wonder most people are confused by physics...it's not often when you can fit something longer than a barn inside it without bending it ;)

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t00fri
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Post #22by t00fri » 28.03.2004, 22:00

Mikeydude750 wrote:Jesus, no wonder most people are confused by physics...it's not often when you can fit something longer than a barn inside it without bending it ;)


:wink:

Well, in science understanding is usually not "served for free on a silver plate"...

In other words, it usually takes a lot of "sweat", before one can see some light at the end of the tunnel.

Sorry, but that's about the best "wisdom" I can offer in this context... :roll:

Bye Fridger

granthutchison
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Post #23by granthutchison » 28.03.2004, 22:05

Mikeydude750 wrote:Jesus, no wonder most people are confused by physics...it's not often when you can fit something longer than a barn inside it without bending it
There's no paradox, though ... it's just that things which appear simultaneous to someone standing in the barn don't appear simultaneous to someone running with the pole.
The guy in the barn sees a short pole and the rear door closing before the front door opens (so the pole fits in the barn). The guy with the pole sees a short barn, but in his reference frame the front door opens before the rear door closes (so the front of the pole is out of the barn before the rear of the pole has entered it). Each observer is quite happy with the internal consistency of his experience.

Grant

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t00fri
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Post #24by t00fri » 28.03.2004, 22:54

granthutchison wrote:
Mikeydude750 wrote:Jesus, no wonder most people are confused by physics...it's not often when you can fit something longer than a barn inside it without bending it
There's no paradox, though ... it's just that things which appear simultaneous to someone standing in the barn don't appear simultaneous to someone running with the pole.
The guy in the barn sees a short pole and the rear door closing before the front door opens (so the pole fits in the barn). The guy with the pole sees a short barn, but in his reference frame the front door opens before the rear door closes (so the front of the pole is out of the barn before the rear of the pole has entered it). Each observer is quite happy with the internal consistency of his experience.

Grant


Right...

Clearly, this kind of example also illustrates that one has to be careful not to violate causality when "playing" relativistic "(mind) games"!

In particular, people who want to "ride on photon beams" (i.e. (incorrectly) want to Lorentz transform to the photon's rest system) will have to watch out...

Bye Fridger


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