Recent content by Andru10

I am satisfied that the measurements are time-like. Thank you all!

Well all UPs lead to a relationship like that. You are correct, but I'm trying to relate to the principles of QM, principles which are assumed to be correct (in the Copenhagen interpretation). One principle states that observables are operators in the complex Hilbert space and another states...

I am familiar with time-like and space-like intervals, but I considered the 2 measurements to not be causally linked and therefore space-like. Also, that version of the UP has been proven... the operators for position and momentum do not commute.

I think I understand now. Because of the Lorentz transforms, the values measured for position and momentum will, in the frame of reference in which the measurements are simultaneous, be such so that Heisenberg's uncertainty relation is satisfied.

The uncertainty principle says that you can't simultaneously measure position and momentum with arbitrary precision. So you can measure one at a time t1 and the other at a time t2 with t2 > t1, thus not measuring both simultaneously, but relativity tell us that there exists a frame of reference...

Are there any known metrics in which black holes do not have the Schwarzschild radius? Specifically, I'm interested in whether it's possible for a black hole to have an event horizon which is not of the form: constant * mass.

Thank you, this cleared things up for me :)

The Voyager probes are traveling at non-relativistic speeds, at the edge of the solar system where the gravitational field is about 0 so we could consider them a rest frame. If so, from my calculations using the formula for time dilation: \tau(t) = \frac{c}{g} \operatorname {arsinh} \left(...

Yes, but it's so weak, it's negligible compared to the electromagnetic force. It's negligible compared to all of the other forces. Even the weak nuclear force is 10^25 times stronger. The EM force is 10^36 times stronger than gravity.

Gravity is produced and affects anything with mass, so yes, atoms too. In General Relativity gravity isn't regarded as a force but as the geometry of space-time itself. Mass and energy (which are equivalent) curve space-time, and this curvature is gravity.

I never said the video was real, I also believe it to be fake. I'm just saying that it's possible ... barely. You'd need a really big transformer to get 700 A. The normal ones (for charging batteries) get saturated when a very high voltage or current is applied... and even those transformers are...

I have calculated that 100 parallel wires, each with a current I passing through them, with length 1m, will generate a magnetic field strong enough to lift 1 kg up to 0.5 m ... if I is 700A, which is indeed absurdly high. I deduced this from the fact that mirror charges will appear when current...

The difference is that the magnet has a fixed magnetic field not strong enough so that the electromagnetic force can overcome gravity. In case of the coil however the magnetic field is proportional to the intensity of the curent. So if we create a high enough current it's possible that the...

What about a coil of wire over a metal surface ? Applying alternating current to the coil will create a magnetic field, and won't the induced Eddy currents in the metal surface repel the coil and make it levitate ? (I remember seeing this on one of the electro-magnetism courses MIT has on youtube)

Isn't the repulsive nature of the strong nuclear force just a manifestation of the Pauli exclusion principle ? At least that explains why 2 neutrons can't stick together.