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Physics Meta

7:11 AM

Q: What does "people reached" mean?

I can't elaborate but what does this these words "people reached" mean? For example:- 15k people reached.

discussion

More Anonymous

7:52 AM

Any experts on GR?

was seeing an old question of mine ... I was hoping someone could enlighten me?

Physics Meta

8:32 AM

Q: Why am I not allowed to ask a question?

I do not understand why should I be barred from asking questions despite having asked some question with very good reputations.

discussion support

Slereah

@MoreAnonymous shoot

KEVIN N

9:35 AM

This is indeed a very long question but if you could take your time to answer or briefly look at this problem, it'll be very helpful to me.

Q: How do Forces actually Work?

I've been surfing the web for quite a while, finding the answers I would need, but couldn't find a convincing one. First of all I need to remind you that this a very long/continuous question, so please kindly take your time. I'll provide some illustrations to make things easier and more pleasant ...

newtonian-mechanics classical-mechanics atomic-physics interactions molecular-dynamics

Captain Bohemian

10:09 AM

does a usual mobile phone with the function of connecting to internet have the function of scanning?

1 hour later…

PM 2Ring

11:17 AM

Hey @JohnRennie I just linked your answer about nuclear shells here. I'm sure your answer will help the new OP, but the questions themselves aren't very similar, so I didn't vote to dupe-close.

I found this but I don't think annav's answer is very helpful.

John Rennie

@PM2Ring thanks :-)

PM 2Ring

@JohnRennie No worries! I love that answer. :) I see that Poutnik has now posted a correct answer, but it's a bit terse, although he may be planning to flesh it out.

3 hours later…

More Anonymous

2:44 PM

@Slereah basically this:

Q: Fluid in spatially enclosed universe and some additional assumptions?

Background In general relativity I was wondering about the following Universe: Imagine a spatially closed universe containing only a perfect fluid: $$x'_i =x_i + L_i $$ where $i =1,2,3$ one of the spatial components. Now, the perfect fluid in thermal equilibrium has the stress energy tensor: ...

thermodynamics general-relativity stress-energy-momentum-tensor

Any idea what the Lagragian would be ... Also shd one assume the desnity is also a funciton of volume and temperature

thermomagnetic condensed boson

3:00 PM

can soemone with a solid knowledge in solid state physics answer the question at physics.stackexchange.com/questions/360204/… ? I am really eager to get where the asker went wrong

Abcd

@JohnRennie Are you there

John Rennie

@Abcd hi

JMac

3:22 PM

Anyone know why Chris would have deleted this answer physics.stackexchange.com/a/487146/127931 I understand why he sent the comments to chat; but I really don't understand why he deleted my answer as well...

ACuriousMind

@JMac I've undeleted it, since it looks like a misclick to me.

John Rennie

3:38 PM

arxiv.org appears to be down ...

PM 2Ring

3:51 PM

I got into a long comment discussion about the CMB, and the surface of last scattering, which mutated into this chat room. It seems to have died down now, but I get the feeling that the OP is still unconvinced, and clinging to their misconceptions. The discussion started getting repetitive, which is never a good sign.

ACuriousMind

@JohnRennie Works for me, but front page says: "21 Jun 2019: Attention Users: there may be a brief service disruption on Sunday, June 23 due to maintenance by our network provider."

PM 2Ring

But I'd appreciate it if anyone else could take a brief look at it, to make sure I didn't make any blunders. Of course, I might have some misconceptions about this stuff. ;) But I think I've got it fairly correct.

John Rennie

@ACuriousMind ah, it's back! :-)

PM 2Ring

At one stage the OP said he wanted @JohnRennie to adjudicate, so if you could make a comment in that room it'd be really helpful. But please don't feel obliged in any way!

John Rennie

@PM2Ring i'm reading it now ...

PM 2Ring

3:56 PM

@JohnRennie Much appreciated!

John Rennie

in Discussion between PM 2Ring and user157860, 2 days ago, by user157860

No, BB theory says that there was a possibly infinite uuniverse with all energy-matter concentrated in a very tiny place. Then the space started expanding at c and later at more than c and part of the plasma is the observable universe. There is no surface there is matter and radiation pushing away at c+. All radiation emitted in billions of years is moving away from us and every point.

Ah, the old "Big Bang happened at a point" misconception.

PM 2Ring

@JohnRennie Yes, but I think I addressed that. I guess I should've linked to your canonical answer for support.

John Rennie

@PM2Ring it looks to me as if the OP still doesn't get it. You've done your best, but sometimes you need to give up and walk away.

PM 2Ring

@JohnRennie Thanks.

I don't feel like it was a waste of time, though. And I may be able to recycle some of that stuff at a later date. :)

3 hours later…

More Anonymous

6:37 PM

@PM2Ring in my experience its usually it's a good idea to supplement these discussions from posts the site ...

dmckee

::sigh:: I don't think there is any "nice" way to tell someone that they've never shown any facility for judging the "reasonable"-ness of physics arguments.

Jokela

7:24 PM

@dmckee Everything is ok as long as we remain on usage of words. The history knows too much bad examples about "arguments" which are defensed by force. So Peace! Max Planck phrased it perfectly; “A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.” ...so why even bother?

PM 2Ring

7:46 PM

@dmckee Agreed. Criticizing a core argument from a mainstream theory by saying "that's insane", or "that's unscientific" borders on the Argument from Incredulity. Or steps over the border. ;)

Sebastiano

Q: Several explanations for a question of an exercise of electomagnetism

If in a flat capacitor, formed by two circular armatures of radius $R$, placed at a distance $d$, where $R$ and $d$ are expressed in metres (m), a variable potential difference is applied to the reinforcement over time and initially zero, a variable magnetic field $B$ is detected inside the capac...

electromagnetism capacitance maxwell-equations

@Qmechanic Good evening, Mr. Moderator. I wanted to know if my question needs to be modified or if it is not clear. I always hope it will be appreciated and to get an answer. My question is the previous added.

1 hour later…

Hotlab

8:56 PM

wow this is some elitist shit

PM 2Ring

@Hotlab What is?

FWIW, that "proton decay" question I linked a while ago is now on the HNQ

10 hours ago, by PM 2Ring

Hey @JohnRennie I just linked your answer about nuclear shells here. I'm sure your answer will help the new OP, but the questions themselves aren't very similar, so I didn't vote to dupe-close.

PM 2Ring

9:32 PM

@knzhou You may wish to respond to this question which concerns an answer you wrote in 2016