Relativity 2: Superluminal Motion

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Consideration of the appearance of an object moving away from you and moving toward you taking into consideration the delay caused by the finite speed of light.

You can experiment with some of these ideas here:
http://www.wiu.edu/users/jdd109/stuff/relativity/LT.html
For further discussion, see http://groups.google.com/group/sci.physics.relativity/browse_thread/thread/79...

Category:

Science & Technology

Tags:

• Principle
• Special
• Relativity
• Superluminal
• Motion
• Speed
• of
• Light

[good4usoul]

1. true. 2. true. 3. true. The speed of light can be determined from the wave equation derived from Maxwell's equations. And Maxwell's equations are determined relative to a "stationary" point.

[as23we12]

Hi,

I dunno if you are still checking these but.....

Question. A photon emitted in a direction travels in that direction at the speed of light.....True? If emitted from an receding object...the light remains at C. We don't measure photons moving at half C toward us do we. In the case of an object receding at half the speed of light, photons emitted in our direction would be detected by us moving at the speed of light.

...Is this true?

I have another question if it is.

[good4usoul]

Hi. true, true, true. I guess that didn't post as a response. I put a link in the sidebar to a demo I've been working on. It might help.

[as23we12]

Thanks for taking the time to reply...I appreciate it.

How is direction tied to momentum? Particularly with regard to photons?

I'm having trouble with matter/energy. I keep coming up with only matter and momentum.

As I define energy...I just get matter and momentum.

It almost seems as though energy is a contrivance. A way of describing the effect of momentum.

I could use some help.

[good4usoul]

All I can think to tell you right now is that Units on energy is kg*m^2/s^2; That is mass *velocity squared. Units on momentum is kg*m/s; that is mass * velocity. On photons, you multiply Planck's Constant times the frequency, and Planck's Constant has units of momentum all by itself, if I recall correctly. Now that I think about it, I'm not sure a transverse water wave has a momentum or not. But electromagnetic wave does have momentum. Any of that help?

[good4usoul]

Thanks!

[ragragdoll]

Clear simple explanation, thank you.

[as23we12]

Sure does!

Once again, thanks for taking the time to reply. I appreciate it.

You're obviously one of the good guys.

[johnwally]

I love watching you trying to explain whats going through your head ,it makes me feel better about me feeble attempts ,you do a good job