печально я гляжу
Aug. 8th, 2020 12:41 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
juan_gandhiВот тут
https://www.youtube.com/watch?v=QcUey-DVYjk
"излагают гравитацию" на пяти уровнях: маленькой девочке; 16-летней школьнице; студентке младших курсов; аспиранту; завкафедрой физики.
Маленькая девочка в общем-то вполне врубается в ее уровень, хотя и довольно примитивно; известные мне дети все были гораздо более продвинуты; но в целом же Ей Было Интересно, и в общем-то нормально.
16-летняя, которая планирует стать физиком - уже швах. На половине рассказа ее глаза помутнели (я преподаю, так я вижу это сразу), глядеть она стала не в глаза астрофизику (женщине), а, извините, на ее грудь, и элементарных разъяснений она ни хера не поняла. По мне так контент был для третьего класса (советской школы).
Студентка, якобы физик, при этом китаянка - ну это был абсурд. Внимание она не ослабляла, китаянка все-таки. Но эта физика у нее на уровне седьмого класса (советской) средней школы. Ужас. Т.е. задачи на всякое там бросание шарика под углом она, по-моему, не решит.
Аспирант-физик, занимается нейтронными звездами. В черной дыре, говорит, space-time breaks down. Но это ладно; так-то вполне нормальный физик, но оба уже перешли на язык, "понятный народу".
https://www.youtube.com/watch?v=QcUey-DVYjk
"излагают гравитацию" на пяти уровнях: маленькой девочке; 16-летней школьнице; студентке младших курсов; аспиранту; завкафедрой физики.
Маленькая девочка в общем-то вполне врубается в ее уровень, хотя и довольно примитивно; известные мне дети все были гораздо более продвинуты; но в целом же Ей Было Интересно, и в общем-то нормально.
16-летняя, которая планирует стать физиком - уже швах. На половине рассказа ее глаза помутнели (я преподаю, так я вижу это сразу), глядеть она стала не в глаза астрофизику (женщине), а, извините, на ее грудь, и элементарных разъяснений она ни хера не поняла. По мне так контент был для третьего класса (советской школы).
Студентка, якобы физик, при этом китаянка - ну это был абсурд. Внимание она не ослабляла, китаянка все-таки. Но эта физика у нее на уровне седьмого класса (советской) средней школы. Ужас. Т.е. задачи на всякое там бросание шарика под углом она, по-моему, не решит.
Аспирант-физик, занимается нейтронными звездами. В черной дыре, говорит, space-time breaks down. Но это ладно; так-то вполне нормальный физик, но оба уже перешли на язык, "понятный народу".
Завкафедрой физики из NYU. Смотрит а астрофизика как на говно. Ну, этим разговором я насладился! Не знаю, как вы, я не физик. Но я насладился. Квантовая гравитация! (в изложении для лохов типа меня)
Но трехмерная голография!
И тут мы открываем матрицу: https://t.co/UMAeTFyEkT?amp=1
Хорошо эта астрофизик сравнила гравитацию с температурой.
Такие дела.
Re: Full mass-energy equivalence
Date: 2020-08-11 08:14 pm (UTC)But m0 for a photon is zero, right?
Therefore m will be zero too, right?
Re: Full mass-energy equivalence
Date: 2020-08-11 08:39 pm (UTC)(But v is c, so it is not so simple)
Re: Full mass-energy equivalence
Date: 2020-08-11 08:47 pm (UTC)... only if the photon does not move.
When photon moves -- it has mass (m, not m0).
So gravity interacts with the mass of a moving photon.
> v is c, so it is not so simple
Hmm, right.
But then what's the point to use this uncertain formula [m = m0 / sqrt(1 - v2/c2)]?
Re: Full mass-energy equivalence
Date: 2020-08-11 09:38 pm (UTC)Gravity-photon interaction
Date: 2020-08-11 09:45 pm (UTC)If gravity does not interact with the photon, then why does a photon have different behavior around bodies with higher masses (higher gravity)?
Re: Gravity-photon interaction
Date: 2020-08-12 06:17 am (UTC)If the gravity interacted with light in Newtonian way, you would need the mass of a moving photon. However, supposing its mass is nonzero, you should get it decelerate, when receding from a body with mass. This makes v not equal to c, denominator is no longer zero, the mass of photon computes to zero, and the Newtonian gravitational force acting on light turns to zero.
Why does the light appears to interact with massive bodies after all - that's the sign a new explanation is needed. One that doesn't depend on the mass of photon.
no subject
Date: 2020-08-11 08:45 pm (UTC)no subject
Date: 2020-08-11 08:51 pm (UTC)> you know some physics?
Yes.
I never claimed that my memory has 100% recall.
no subject
Date: 2020-08-11 09:15 pm (UTC)Hypothetical past predictions
Date: 2020-08-11 09:26 pm (UTC)So this is about you confusing "memorizing" vs "recall".
And about you not understanding that "evaluating" is an important component of understanding.
Re: Hypothetical past predictions
Date: 2020-08-11 10:48 pm (UTC)Rigid analysis
Date: 2020-08-11 11:02 pm (UTC)It is "all or nothing" for you.
Re: Rigid analysis
Date: 2020-08-11 11:42 pm (UTC)Knowing how the relativity term works is the most basic thing in relativity. I have not carefully read your long discussions on star evolution and how the space-time works. This could've been a medium-level stuff, if it were right, okay. It can be difficult sometimes to tell right from rubbish when people write stuff in social media, when they use vague language, sometimes do sarcasms, and there are always inaccuracies, blind spots, and no solid structure in the conversation. So I refrained from making comments on that part.
But now when I see that you literally have zero understanding of the most basic equation in special relativity, well, I am ready to make a judgement. Hear me! You have no understanding of special relativity: zero, nil, nada, nyet. Hence, you are not qualified to discuss general relativity.
There are different levels of understanding, sure, and yours is the complete and utter absence of it. And it's even amusing to a degree how a mature person can keep on going trying to justify his failure or somehow re-frame it as someone else's fault. Amusingly, I don't think you are even trolling us here, do you? You literally believe what you are saying, you actually believe that your opinion has some weight and you have some credibility in this subject, as well as in many others. Seriously, I've met a few people with skewed perception of their own abilities, it's not totally uncommon, but from this moment you probably lead my personal chart.
Troll vs anti-troll
Date: 2020-08-12 03:02 am (UTC)That only confirms that your ability to differentiate between different levels of knowledge - is quite weak. You struggle to even understand the concept of partial knowledge.
> It can be difficult sometimes to tell right from rubbish when people write stuff in social media
When I analyze your writings - most of the time I have no problem to classify your statements into "rubbish" vs "right" baskets.
> you literally have zero understanding
That is clearly "rubbish" basket.
> I am ready to make a judgement
That is correct.
However your judgement is rubbish.
> You have no understanding of special relativity
That is, clearly, rubbish.
> Hence, you are not qualified to discuss general relativity.
What you wrote here is triple rubbish, because:
1) I was qualified to discuss general relativity the first time I heard about general relativity (and my knowledge about general relativity was, actually, close to zero).
2) "Hence" cause-effect connection is rubbish, because lack of knowledge does not automatically disqualify from discussion.
3) I actually understand basic concepts of general relativity, and my understanding of general relativity is well above 99% of understanding of general population.
> yours is the complete and utter absence of it
It looks like you do misunderstand what "complete absence" mean.
> trying to justify his failure
What "failure" are you talking about?
> you are even trolling us here
I have advanced anti-troll skills.
This is my time to shine, because I communicate with a troll.
> You literally believe what you are saying
Correct. I do not like to lie and do not like to hide.
> you actually believe that your opinion has some weight
Correct.
> and you have some credibility in this subject
Correct.
However I suspect that you misunderstand word "some" (similar to how you misunderstand word "complete absence"), so you, probably, do not understand your own statement correctly.
> I've met a few people with skewed perception of their own abilities
Just for your information: all people have skewed perception of their own abilities, because evaluating people's ability is quite complex.
> you probably lead my personal chart
Yay!
Re: Troll vs anti-troll
Date: 2020-08-12 03:30 am (UTC)Физика или не физика, а что за фигня, каждый раз разговор об абстракциях переходит на разговор о твоей личности. Меня это как-то смущает. Что-то тут не так в нашей вселенной.
Re: Troll vs anti-troll
Date: 2020-08-12 06:26 am (UTC)