Recent content by pesto

Thanks again. Fixed my post too :).

Woah! Back to the old drawing board. Thank you for the explanation. I though u \oplus v or "s" was the velocity of objectB relative to the observer!

Does the u \oplus v means the velocity of the emitter relative to the observer plus the velocity of the photon relative to the emitter? If I could try your patience for one more stupid question, what's a plus sign with a circle around it? Just a sign for adding vectors or what? Thanks again.

Thank you. That's handy.

Fredrik, what equation is that? Does it have a name I can google? :)

Hi keepitmoving. Mind if I take a crack? You said you heard that "the photon moves relative to every observer at c". It does. The key phrase is "relative to the observer." The photon, relative to the observer, from the frame of reference of the observer, is c. The photon, from the frame of...

Thank you very much.

Would it be proper to say then that "From my frame of reference, the photon is traveling faster than C relative to the emitter" while the emitter is moving opposite the direction of the photon, or is the distance is greater than c x time as far as we can take it? I know it's a semantics...

Good hint turin. dance_sg you're on the right track thinking of trigonometrey to find the sides...whaddya know about angles?

Thanks for posting. Can't believe I got it wrong, I thought the temperature would stabilize :/.

Sorry to interject so late, and please let me know if my questions are unwelcome, but did I read correctly that an outside observer would not be able to see the creation of a black hole, but an observer inside the gravitational field would? This would be essentially the same situation as...

All of the above, with the addition of information about the device itself, where it came from, who runs it, what they're doing with it. I'd also love to see more information on how the muons are created. Thanks for the great link, and sorry if I posted in the wrong place.

Hi everyone. I was just watching a show called Time on Discovery science where our host takes us to the Alps and shows us a device which counts muons created by light rays hitting the atmosphere. I tried googling for it but came up with nothing, so I was wondering if anyone here might know where...

Do I have this right? The observers will measure different frequencies, but they will also measure different wavelengths. However, the wavelength * frequency will always = c. This is not the case for sound, which, as Janus pointed out, would equal the speed of sound - the speed of the train...

Best of luck and thanks for the input.