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 black-holes
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1h
comment Flirting with a large black hole event horizon
"So lets say we set a spaceship in orbit around a black hole, with the centre of the ship having a peripress on the event horizon of the black hole." There is no such orbit AFAIK.
1h
comment According to Ohm's Law, shouldn't there be a zero electric potential within a capacitor since the current is 0?
@Goldname, capacitors do not obey Ohm's 'Law'. A device that obeys Ohm's law is an ohmic device. Ohm's law is not a specific case of voltage, it is a specific case of a voltage - current relationship.
Feb
6
comment Time Dilation and the direct opposite
I'm voting to close this question as off-topic because "their a comic speed of decay at the point you come to complete stop in the x y z space time"
Feb
4
comment Interpretation of time dilation
There is no inertial reference frame with speed $c$ in any other inertial reference frame. Put another way, an entity with speed $c$ in an inertial reference frame has speed $c$ in all inertial reference frames. Thus, "if you travel at the speed of light", you have no inertial reference frame with which to make observations. So, it makes no sense to claim "you observe no time passing!"
Jan
31
comment Why isn't a Photon justified in concluding that it is at rest and everything else is moving past it at c?
"Which part did I overlook?" - that there are no inertial reference frames with relative speed $c$. By the Lorentz transformation, an object with speed $c$ in an inertial reference frame has speed $c$ in all inertial reference frames, i.e., there is no inertial reference frame in which a photon is at rest.
Jan
28
comment Expectation value of a state eigenvalue
I'm voting to close this question as off-topic because the premise of the question is false. Is the expectation value always an eigenvalue?
Jan
25
comment Input Resistance vs Output Resistance
@LiamA, in many cases, the input resistance is a function of the load connected to the output terminals and, similarly, the output resistance is sometimes a function of the source connected to the input terminals. However, I'm not sure what you mean by your last sentence. The are a number of approaches to measuring input and output resistance that can be found with a quick Google search. For example, one can place a variable resistor in series with a voltage source, adjust the resistor until the voltage across the input terminals is 1/2 the source voltage and then $R_{var} = R_i$
Jan
25
answered Input Resistance vs Output Resistance
Jan
24
answered How does Newton's 3rd Law work in this scenario? Why is my reasoning wrong?
Jan
24
comment Why doesn't an electron's charge rip the electron apart?
"what keeps an electron from being divisible" - if the electron is a fundamental constituent of reality, then the answer must be the law of non-contradiction.
Jan
24
answered Annihilating coherent state
Jan
24
comment How can the position of charge be determined without EM waves?
How can the position of any entity be determined without interacting with the entity?
Jan
17
comment Why do scientists measure fundamental constants so precisely?
"Can you give examples, where such accuracy is important?" - the measurement proposal results in a grant?
Jan
16
comment How does the uncertainty principle make sense of the fact that momentum for massive particles depends in part on position?
First, one must come to grips with, if one can, that quantum particles do not, in general, have either definite momentum or definite position. It's not that the particle's position is uncertain, i.e., definite but not exactly known, it's that the particle doesn't have a definite position (unless you subscribe to the Bohmian formulation) and similarly for momentum
Jan
14
comment What came first, the Universe or the Physical laws that govern the Universe?
"If universe came first and created physical laws for itself" - I have grave doubts that this expresses anything meaningful.
Jan
12
awarded  black-holes
Jan
9
comment Using wormholes to see out of the visible universe
"but what if we aimed our telescope at a wormhole?" - the warranty is voided?
Jan
9
comment Aircraft - static take off - how is this possible?
"For instance, it's not that hard to wheel-spin a stationary car" - for an aircraft, unlike a car, the wheels are not directly driven.
Jan
8
comment Quantum Mechanics/Physics Textbook
Wouldn't a better home for this be chat? It's a fact that this isn't a conceptual physics question and this (the main site) is not a physics forum.
Jan
7
comment Special relativity-measuring a lorentz contraction as reference frame changes
Short answer: the balls are not released at the same time in the ground reference frame.