Everything posted by Genady
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The twin Paradox revisited
How can I know what the arguments are?
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Question about planetary gravity
Thank you. Yes, this is clear. I want to point out that I did not ask, which other effect would make the planet spherical. My question was, and then,
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Question about planetary gravity
Perhaps, I did not understand the question, then. Agree with this. It answered mine.
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Question about planetary gravity
Yes, the resulting shape is not necessarily spherical, because of effects of other factors. The electric charge is a factor that make The gravity of the planet is also a factor that tends to make it spherical. In a situation that the planet is made, say, of a fluid or a thin dust, and it does not rotate, does not experience tides, etc., it will become spherical if electrically charged. Or it will fall apart, if the charge is too strong. However, material and shape of the parts, tectonic movement, etc., mentioned in the posts above, can make it take other shapes. Thus, "tend." The same with micelles, whose actual shape depends on other factors as well (my emphasis): I've asked about another physical effect that could affect the process described in OP. Electric charge would affect this process. Other effects, already mentioned, would too.
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Question about planetary gravity
It is an answer to this ^^^ question. If a planet is electrically charged, all parts will push away from each other, and the planet will tend to be spherical.
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Question about planetary gravity
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Question about planetary gravity
A hint:
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The speed of light and causality
They wouldn't. w, not c. edit: x-posted with @Lorentz Jr
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How far into the future do we care? And why?
I don't know how it relates to the previous exchange, or to the OP for that matter, but I'm ready to answer the questions: No, for a simple reason: I don't have a fb or any other social media account. The only online socializing I have is SFn.
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The speed of light and causality
I think they will not. It has already happened. Nothing in our environment moves faster than c/w/z, but until SR we believed that causality speed is unlimited.
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How far into the future do we care? And why?
Excuse my limitations, but I don't know what you mean in these statements.
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The speed of light and causality
Causality is not defined by the speed of light. It is defined/limited by a speed equal to some number, c, whose numerical value depends on the units of distance and time. Light propagates in vacuum with the same speed c, just as any massless particles, and gravitational waves. The causality and the speed of light in vacuum are correlated, but they do not cause each other.
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How far into the future do we care? And why?
About half a dozen. I am who I can be.
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How far into the future do we care? And why?
But close...
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Two massive objects traveling in time
I would say this is more or less a correct statement. Where do you think it's wrong, @Genady? Have I missed something? I think that you, knowing what it should mean, interpret it as a more or less correct statement. I think that in QM a particle generally does not have a definite position, and this is not the same as locations extend through space. (Similarly, not to have a definite color is not the same as being rainbow-like.) OTOH, if being extended means having a wave function in position space, then this wave function is determined, and it does not have varying degrees of probabilities.* I know that you know all this - I try to explain why I see this statement... in fact, not even wrong. *unless it's a mixed state, but OP didn't mean this, I'm sure
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How far into the future do we care? And why?
Thank you. I have many choices.
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How far into the future do we care? And why?
I'm too, and my attitude is similar to yours in spirit (no pun intended), except I'm allergic to alcohol and generally don't watch movies, so I'd find something else to do in the meantime.
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Two massive objects traveling in time
Yes, I think so.
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How far into the future do we care? And why?
And if they find such a way, then some people will hit the mountain and others will land with the parachutes and will be eaten by bears.
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Two massive objects traveling in time
Do you have a reference to this statement?
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The Two Light Beam Simultaneity Conundrum
This is a direct opposite to the truth. In the 1905 paper where Einstein has introduced SR (einstein_electrodynamics_of_moving_bodies.pdf (umd.edu)), he has started with this exact problem: Then he has solved this problem by including the time taken for the light to travel from position to position in the definition of simultaneity:
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Question about planetary gravity
Aren't static, charged BH perfectly spherical, too?
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How far into the future do we care? And why?
A bigger problem that this parable does not mention is that soon a businessman will come with a big fleet and will kick the fisherman out of business. Then the fisherman will have to work for the businessman and will not have time to sleep late, etc.
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Question about planetary gravity
No problem, although it's a bit complicated. I assume you mean ethnicity rather than ethics. My grandparents on the father's side ran away from pogroms in Belorussia and eventually settled in Baku. My father was born in Baku. My mother's family, including my mother, ran away from advancing German army in Ukraine, in the WWII. They too settled in Baku, after running around for some time. All the great-grandparents were Jewish, but starting with the grandparents, none were religious. My grandparents spoke Yiddish and Russian. My mother spoke Ukranian and Russian. My father, some Azeri and Russian. My first language was Russian, although I remember some words and phrases in Azeri. So, I'm not sure what is my ethnicity. Also, Baku, at least at that time, was a very cosmopolitan city. [Perhaps, the later part of this thread should be moved to The Lounge forum.]
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Question about planetary gravity
I remember learning about Sabir in school. Also, Sabir street in Baku. I have been to Shamakhy, Sabir's birthplace, but not because of that, but rather on a tour to Shamakhy Astrophysical Observatory - Wikipedia. Are you Azeri?