Recent content by alphawolf50

Aaahhh, you're running nginx as a cPanel plugin... I see it now. I didn't get the distinction between "nginx admin" and regular old "nginx". Too bad :-(

I like! Next on the list: enable SSL :-) Guessing by the PTR record in DNS, physicsforums.com is already on a dedicated IP address... Just get one of the free SSL certs out there installed, and no longer will everyones' login credentials be passed "in the clear". A company called StartSSL...

I think I get the general idea of what you fine fellows are saying. Nearly everything I know of quantum mechanics comes from watching the Science Channel, and one program used a coin-tossing analogy to describe entanglement. It left the impression that, while each toss was random and you...

Are you saying entanglement is only good for one observation? If Alice sees "clockwise" on her first observation, she knows that Bob is counter-clockwise -- but if she observes her particle a second time she knows nothing of Bob's particle?

Would it work better if I said "Bob and Alice each take a snapshot of spacetime from their unique frames of reference" ? I was attempting to rephrase what you said about designing coordinate systems where Bob is at rest, but apparently it was a poor rephrase :) The circle I'm talking about is...

Hi JesseM, That makes sense. I had forgotten about the inertial/non-inertial reference frames. I just want to paraphrase what you said to make sure I actually understood :) Since Bob is accelerating, his frame of reference is non-inertial. But if we were to take snapshots of the...

Hi Drakkith, Technically, everything we see with a telescope is "the past", specifically because the speed of light is finite :) But, yes, I believe you are correct if you're saying we can't see *further* into the past by moving our telescope away. However, in the context of the Andromeda...

Thanks, Hurkyl. So basically this paradox requires you to have some manner of instantaneous "remote viewing" of Andromeda, rather than relying on light to travel across the universe and let you know what has happened?

Can we "use" the Andromeda Paradox? Perhaps the term I should be using is "relativity of simultaneity"... anyway :) Usually I see the Andromeda Paradox stated in terms of a stationary observer and another who is moving toward the galaxy. I did find one source that said the reverse effect...

The opposite, "heating" with no temperature change is observed quite frequently, though most don't notice. Melting ice can absorb a lot of "heat" -- but just as the ice was 0 degrees C before the state change, the water is 0 degrees after. As long as the heating is slow and even, the ice/water...

Ummm... Yes they do, in the case of Single Wire Earth Return transmissions systems, which was the topic of this thread.

NEC standard is no more than 25 ohms resistance to ground. I realize this isn't the same as "resistance through the earth", which changes depending on moisture and mineral content along the path, but it at least gives you a starting point. Like OmCheeto said, yes, you can do it with DC -- in...

From the link: This baffles me -- how can radiation from a cold object cool another object? I'm familiar with laser cooling, but this sounds like a different animal. I haven't seen the setup, but I would venture to say they've got the causality reversed. IE, the mirrors are isolating...

Your friend is wrong :) If there are two ships, A and B, and they are traveling at .75c relative to a stationary observer C, then both A and B believe they are approaching the other at .96c. The formula is: v=\frac{w - u}{1 - wu/c^{2}} in other words (btw, since we're using "natural...

Simple, you add any amount of particles that are above 0K, and you've added an arbitrary amount of thermal energy to the space. On the other hand, if you fill that space with particles at 0K, it has the same thermal energy as it did before. "Heat" is a noun synonymous with thermal energy...