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user116211
3:17 AM
WoW! So many nominations; I never expected!!
 
user116211
There is JD too ;P
 
user116211
I'm not seeing Lumo @0celo :(
 
user116211
My first choice was ACM; and he is running; that's good....
 
user116211
There is @knzhou too!
 
user116211
New faces...
 
user116211
3:28 AM
Hey, I can't upvote a comment; am I the only one who can't upvote the comments? I'm not getting it ;/
 
0celo7
0celo7
@DanielSank It was a trainwreck.
 
Danu
Danu
Ah so you agree @0celo7
 
0celo7
0celo7
Yes
I don't know what happened there
 
user116211
Man, Alfred's nomination profile is the best ;P
 
DanielSank
DanielSank
@Danu It's less worship than "don't insult a group of people who risk their lives in service of the country".
 
Danu
Danu
3:33 AM
@DanielSank ...the implicit assumption being that that is something to be applauded
@0celo7 wasn't it rather standard Trump?
 
0celo7
0celo7
@Danu No.
That's not the man who got my vote in the primary.
 
Danu
Danu
Oh yes it is
And you will bear the shame for the rest of your life hehe
 
0celo7
0celo7
Same person, sure, but you know what I mean.
@Danu I don't feel any shame.
 
Danu
Danu
I know I'm just poking fun
 
0celo7
0celo7
If you think that's something to be ashamed of, we're not friends anyway.
@Danu Ok ok.
I have a lab report to write.
Cheerio
 
DanielSank
DanielSank
3:35 AM
@Danu Recall that my entire worldview is essentially natural selection...
 
Danu
Danu
Bold claims. For the record, I do think it's something to be ashamed of, but I don't think this must necessarily impact other aspects of how we relate to one another
@DanielSank eh... Ok?
 
DanielSank
DanielSank
I am not pro-war at all, but I understand the survivability of a biological system that defends itself.
 
0celo7
0celo7
@DanielSank I don't think the US has done much "defending itself" in the past few wars.
 
user116211
knzhou's nomination profile seems more about the others than him ;P
 
Danu
Danu
Also surviving is not at stake
 
DanielSank
DanielSank
3:37 AM
@MAFIA36790 Perhaps.
@Danu Let's talk about something else before we get into an argument.
I'd like to discuss this topic, but physics chat is not the right venue.
 
HDE 226868
HDE 226868
FYI @MAFIA36790 et al. - There's a dedicated election chat room available. I'd highly recommend it, so the main room doesn't get taken over with election chatter . . . which may have happened a lot in previously elections on SE.
2
 
user116211
@HDE226868 Ah! sure.
 
Danu
Danu
Alright. I'm heading out anyways. Cya @DanielSank, @0celo7
 
user116211
@HDE226868 @JohnRennie and other room owners, please super-star it.
 
DanielSank
DanielSank
Could we instead super-star a more obvious link?
Let's try:
^ Someone star that?
 
HDE 226868
HDE 226868
3:43 AM
@DanielSank Pinned. Though I'm not sure who pinned my message; it wasn't me. Seems there are ghosts about.
 
user116211
Wait, wait, can a user other than a room-owner pin a super-star?
 
user116211
I didn't know that ;P
 
0celo7
0celo7
@HDE226868 Please give me an hour suspension so I do this damn lab report
@MAFIA36790 HDE is a mod for some reason
 
DanielSank
DanielSank
@HDE226868 Nice.
 
HDE 226868
HDE 226868
@0celo7 Time management is a skill you need to learn.
 
0celo7
0celo7
3:45 AM
@HDE226868 I can time manage just fine, it's just painful.
 
user116211
@0celo7 I know that he is a mod; but I didn't know that super-star can be pinned by someone other than a room-owner.
 
HDE 226868
HDE 226868
@MAFIA36790 I'm a mod on other SE sites; mods have universal chat mod privileges.
 
user116211
@HDE226868 Ah!
 
HDE 226868
HDE 226868
Mods can do everything ROs can, and more.
 
user116211
@HDE226868 gotcha.
 
HDE 226868
HDE 226868
3:46 AM
Now I need to sleep, and reduce the number of people distracting 0celo7 by one. Good night/day/afternoon/morning/teatime, all.
 
user228700
@vzn Uhh, I meant to ask whether or not the term "centripetal force" is used to refer to forces that cause uniform circular motion(in that only the speed of the body in question changes). After doing some more reading, I've found that this is indeed the case. So, a force other than the centripetal force causes the change in speed of the body?
 
user116211
@0celo7, do it peacefully, I'm not bothering you; but I have questions to ask on ordered semi-group. Would wait.
 
user228700
@vzn And no, she doesn't have any new perspectives on that yet.
 
user116211
@DanielSank: Can't we have a comment link from the election page?
 
user116211
I can't upvote, I can't share a comment ;(
 
user116211
3:49 AM
@KaumudiHarikumar yes. Centripetal force only makes the velocity vector rotate around the axis.
 
0celo7
0celo7
I'll just delete my account.
 
user116211
@0celo7 NOOOO!!
 
user228700
@MAFIA36790 So some other force must be present to cause the speed of the body to change..? But I read that the centripetal force is a net force? Hm.
 
0celo7
0celo7
@MAFIA36790 Don't try to save me.
 
user116211
@KaumudiHarikumar No, that's correct.
 
user228700
3:51 AM
@MAFIA36790 What is?
 
user116211
@KaumudiHarikumar The total force is this:
 
user228700
@MAFIA36790 So which force causes the speed of the body to change? Centripetal force us supposed to be directed radially inward at all times, right?
 
user116211
@KaumudiHarikumar I was writing; see, I'm not the Flash...
 
user228700
@MAFIA36790 Oh crap, I didn't notice the colon at the end of your previous message. I'm sorry. Please go on.
 
user116211
$$\begin{align}\mathbf F &= m\mathbf a~,\\ &= m(\mathbf{a_r} + \mathbf{a_\theta}),\\ &= m\left(\dot v~\mathbf{e_\theta}-\underbrace{v\dot \theta~\mathbf{e_r}}_\textrm{centripetal acceleration}\right)\,.\end{align}$$
 
user116211
3:59 AM
@KaumudiHarikumar $m\mathbf{a_r}$ is the force responsible for changing the magnitude of velocity vector.
 
user116211
@0celo7 Of course, I would have saved you if I could help in your lab report T__T
 
user228700
@MAFIA36790 But if the acceleration has these two components(which, I believe it does), then they should add to give a net acceleration in a direction other than radially inward, no?
 
user228700
And if this is the case, the statement "the centripetal acceleration points radially inward" would no longer hold true...
 
user116211
@KaumudiHarikumar Does it really matter which direction the net force is acting? Of course, it won't be radially inward for this means $-\mathbf{e_r}\,.$ This only happens when $\dot v= 0$ i.e., the case concerned is uniform circular motion.
 
user218912
@0celo7 do you know how the $(-i\omega_k)$ term appears in the second expression here
 
user116211
4:05 AM
@KaumudiHarikumar You are coming to a wrong conclusion.
 
user218912
am I being dumb
 
user116211
@IceLord He is busy in his lab-reports; don't disturb him or he would delete his account :(
 
user218912
oh
 
user116211
@KaumudiHarikumar Centripetal acceleration always acts radially inward i.e., $-\mathbf{e_r}\,.$
 
user228700
@MAFIA36790 Well, yeah, I mean, it matters to me because I'm trying to understand it...
 
user228700
4:09 AM
@MAFIA36790 OK. Then what about the fact that centripetal force is a net force? If this force is always radially inward, why is there a tangential acceleration component?
 
0celo7
0celo7
@IceLord Very.
 
user116211
@KaumudiHarikumar I didn't get the question.
 
user228700
@MAFIA36790 You agreed with me when I asked about the validity of the statement "The centripetal force is a net force", correct? According to N2L, the net acceleration of the body is in the direction of the net force. If this is the case, then why is there a tangential component of the acceleration, given than the centripetal force always acts radially inward?
 
user116211
@KaumudiHarikumar I'm not seeing where I nodded with that statement.
 
user116211
Centripetal force is the net force only when the circular motion is uniform.
 
user228700
4:14 AM
@MAFIA36790 Right, OK.
 
user228700
Thanks :-)
 
0celo7
0celo7
> O_O you absolutely cannot be serious.......... you took off two stars because you like a different book better. How did a person as trivial as you survive this long??????
why am I reading amazon reviews of books I own!!!!!!!!
 
user218912
do your lab report.
 
user116211
^
 
user218912
btw I still didn't figure it out xP
 
user218912
4:20 AM
it came out of nowhere
 
user218912
that term
 
user116211
@0celo7 BTW, what sort of review is it other than ranting?
 
user116211
@0celo7 Which book?
 
user218912
I remember I understood it during the lecture
 
user218912
but I forgot now
 
dmckee
dmckee
4:25 AM
@KaumudiHarikumar More widely applicable is "the centripetal force is the net radial force", though that presupposes that you know the center of curvature of the motion so it could lead one into error if you tried to apply it too literally in all cases..
You could also try something along the lines of "the centripetal force is the net force perpendicular to the instantaneous velocity", which I think has a high degree of generality, but isn't so obviously connected to the uniform circular motion context in which we usually introduce the idea.
 
user218912
@0celo7 I figured it out.
 
user218912
thx
 
user228700
@0celo7 You should try "Cold turkey". Google it.
 
user228700
@dmckee Hm. OK. I will think about this. Thanks :-)
 
0celo7
0celo7
@MAFIA36790 Spivak vol 1
I got a copy from a retiring prof
 
user116211
4:36 AM
@0celo7 Differential Geometry?
 
0celo7
0celo7
yes
 
user116211
I have Spivak's Calculus on Manifolds.
 
user116211
I'm eagerly waiting for studying Differential Geometry; might be a year later.
 
0celo7
0celo7
I can't figure out how to label equations in word ARGH
 
user116211
@0celo7 You are using TeX?
 
0celo7
0celo7
4:38 AM
no
word
 
user116211
Arrgh.
 
DanielSank
DanielSank
Hi, everybody.
 
user116211
@DanielSank o/
 
DanielSank
DanielSank
\o
I do love it when you do that.
 
0celo7
0celo7
Word is the worst piece of crap ever made
 
Swapnil Das
Swapnil Das
4:44 AM
hi
 
0celo7
0celo7
unbelievably trash
 
DanielSank
DanielSank
@0celo7 Yes.
@SwapnilDas Hi!
 
user116211
@0celo7 Why are you working on this evil?
 
0celo7
0celo7
@MAFIA36790 Because TeX is more evil.
 
Swapnil Das
Swapnil Das
Oh, you are an experimental physicist? Nice to meet you :)
 
user228700
4:48 AM
@DanielSank Hellow! :-)
 
Swapnil Das
Swapnil Das
Here I've come with a question for you guys. I'm a tenth grader, so really sorry if I sound foolish. I had read one of PSE's member ( a mod?) narrating 'if anyone has undergone the pain of studying GR...' Has anyone of you studied it? Why is it so painful?
 
DanielSank
DanielSank
@0celo7 No way.
@KaumudiHarikumar Hi! :D
 
user116211
@DanielSank I'm a bit surprised on this.
 
DanielSank
DanielSank
@SwapnilDas I have studied GR.
 
user116211
Anyways, engineering:
 
user116211
4:49 AM
0
Q: In a potetiometer experiment when finding the internal resistance of a Dry Cell (not Leclanché), why is the internal resistance varied?

Archit SharmaIn potentiometer,my internal resistance is coming out to be different for different values of SHUNT used. I've tired it many times and each time, the internal resistance seems to be increasing gradually with each reading. Is it due to the heating effects ?

experimental-physics electric-current electrical-resistance
 
DanielSank
DanielSank
@MAFIA36790 Surprised that I think TeX is less evil than Word?
 
user116211
?
 
user116211
@DanielSank No, the otherwise.
 
DanielSank
DanielSank
@SwapnilDas GR is difficult for two reasons, in my opinion:
 
0celo7
0celo7
do I get a say?
 
Swapnil Das
Swapnil Das
4:50 AM
What are those?
 
0celo7
0celo7
@DanielSank oh, I am interested
 
DanielSank
DanielSank
@SwapnilDas Those what?
 
Swapnil Das
Swapnil Das
Points
 
user116211
I initially used the tag electrical-engineering; but then I removed it.
 
0celo7
0celo7
the two reasons, clearly
 
user116211
4:51 AM
@0celo7 go on.
 
user228700
I was wondering, does any of u know/have the link to a nice proof of the equation $v=r$x$\omega$ (all vectors)? I've looked for it everywhere and I haven't found anything useful :/
 
0celo7
0celo7
@KaumudiHarikumar erm, how is $\omega$ defined again?
 
Swapnil Das
Swapnil Das
@danielsank please continue
 
user116211
@KaumudiHarikumar \times
 
DanielSank
DanielSank
Anyway, the two reasons:
1. The mathematics required usually is not already known by the physics student when he/she learns GR.
2. The thing that we study in GR, the metric of space-time, is of a different kind than anything we encounter before studying GR.
 
0celo7
0celo7
4:52 AM
@SwapnilDas I know some GR.
 
user116211
@KaumudiHarikumar wait...
 
user228700
@0celo7 $\omega$ is the angular velocity of the body.
 
DanielSank
DanielSank
Now, item #1 is the main issue. The math itself is not that bad, but physicists use horrible notation and terminology to explain it.
 
0celo7
0celo7
@KaumudiHarikumar sure sure, what's the mathematical def?
 
Swapnil Das
Swapnil Das
Oh
 
0celo7
0celo7
4:53 AM
@DanielSank Is it not that bad?
 
user228700
@MAFIA36790 I found this: physics.stackexchange.com/questions/171159/… but I'm not able to understand it...
 
DanielSank
DanielSank
@0celo7 IMHO it is.
 
Swapnil Das
Swapnil Das
So is it encouraged to have a math degree before studying GR?
 
DanielSank
DanielSank
"A tensor is something that transforms like a tensor" <-- Really?
 
0celo7
0celo7
@DanielSank Ok. We're looking at this from different angles.
 
user228700
4:53 AM
@0celo7 Uh, dunno. Enlighten me?
 
DanielSank
DanielSank
@SwapnilDas No no, not necessary.
 
0celo7
0celo7
@DanielSank Oh, I wasn't thinking that.
 
Swapnil Das
Swapnil Das
I see.
 
user116211
$$\mathbf r ~=~ r\mathbf e_\mathrm r$$

Velocity $\bf v$ is

\begin{align}\mathbf v&=\frac{\mathrm dr}{\mathrm dt}~\mathbf e_\mathrm r+ r\frac{\mathrm d\mathbf e_\mathrm r}{\mathrm dt}\\ &= \frac{\mathrm dr}{\mathrm dt}~\mathbf e_\mathrm r+ r\frac{\mathrm d\theta}{\mathrm dt}~\mathbf e_\theta \;_;\end{align}
 
user116211
\begin{align}\frac{\mathrm dr}{\mathrm dt}&= \textrm{radial component of velocity}\;,\\ r\frac{\mathrm d\theta}{\mathrm dt}&=\textrm{transverse component of velocity}\;. \end{align}


In circular motion the length of $r$ doesn't change and so $\dot r$ and hence the radial component of $\bf v$ for circular motion is always zero.
 
DanielSank
DanielSank
4:54 AM
@SwapnilDas However, no matter whether your study physics, chemistry, math, or computer engineering/science, always you should study math.
Math enables you to move through these other subjects more effectively... more easily.
 
Swapnil Das
Swapnil Das
As a minor?
 
user116211
It's only a matter of transforming the polar coordinates back to cartesian, that you would get the result.
 
DanielSank
DanielSank
@SwapnilDas If you like.
 
Swapnil Das
Swapnil Das
Oh, Ic.
 
0celo7
0celo7
@DanielSank IMO, if you're going to be thorough, the math is bad. Page 1 of a GR book should mention cohomology, since it's a major obstruction to Lorentzian metrics on compact manifolds.
 
DanielSank
DanielSank
4:55 AM
The problem can be that pure mathematics courses study topics that are not necessarily useful for a physicist.
 
Swapnil Das
Swapnil Das
I have similar plans for future. ( Yuk, no chem or CS)
 
user228700
@MAFIA36790 Crap. Polar coordinates? I don't understand :/ What is $e$ supposed to be?
 
DanielSank
DanielSank
@0celo7 o_O
 
user116211
@KaumudiHarikumar $\mathbf e$ is the unit vector.
 
DanielSank
DanielSank
@SwapnilDas Uh, ok so... if you want to do physics, either experimental or theoretical, you need to be good at programming a computer.
 
Swapnil Das
Swapnil Das
4:56 AM
Why so?
 
0celo7
0celo7
Does Witten know how to program?
 
DanielSank
DanielSank
@0celo7 Probably.
@SwapnilDas As experimentalist or theorist?
 
user116211
@DanielSank Then my career is finished before it started ;/ I know nothing of programming....
 
Swapnil Das
Swapnil Das
Theorist :)
 
0celo7
0celo7
As experimentalist, no question
 
user116211
4:57 AM
::sighs::
 
DanielSank
DanielSank
@MAFIA36790 You'll learn.
 
0celo7
0celo7
@SwapnilDas How much math do you know?
 
DanielSank
DanielSank
@0celo7 Not sure what you're saying.
 
user228700
@MAFIA36790 OK this means that I need to go watch that lecture I didn't understand before. Crap, Idk if the proof is even important-it's not given in my textbook for one thing :/
 
Swapnil Das
Swapnil Das
Idk. Math is vast.
 
user116211
4:57 AM
@DanielSank I'm not seeing any programme in the future courses plan that teaches us programming :(
 
0celo7
0celo7
@SwapnilDas I probably know the most about the mathematics of GR in this chat.
@JohnRennie Knows the physics.
 
user116211
@JohnRennie Morning.
 
user228700
@MAFIA36790 What happened?
 
Swapnil Das
Swapnil Das
Morning :)
 
0celo7
0celo7
@SwapnilDas Do you know linear algebra, vector calculus?
 
DanielSank
DanielSank
4:58 AM
@SwapnilDas Ok, suppose you calculate something complicated. Now you want to see if you're right. It's incredibly helpful to be able to do a numerical simulation to check your work.
 
user228700
@JohnRennie: Morning sir! :-)
 
user116211
@KaumudiHarikumar Certainly not you :)
 
John Rennie
John Rennie
Morning. I'm just reading through the moderator nominations ....
 
user116211
@JohnRennie I didn't find your name ;/
 
0celo7
0celo7
@DanielSank I'm not questioning the usefulness of programming for experimental physics.
But I don't think that every theorist needs to be able to program.
 
Swapnil Das
Swapnil Das
4:59 AM
Obviously not. I'm a tenth grader. Those Riemann Zeta function or Euler's Integral pass tangentially off my head lol.
 
DanielSank
DanielSank
@ACuriousMind someone commented on your nomination post saying that you leave disparaging comments. I know that person IRL, so I asked about it. His response:
> Argh, I confused ACuriousMind with <censored>. Comment retracted.
 
0celo7
0celo7
Obviously?
 
John Rennie
John Rennie
@MAFIA36790 I was considering standing if there were no other candidates I approve of, but it looks like that won't be necessary.
 
user116211
@JohnRennie NOOO!!
 
user228700
@MAFIA36790 Phew. OK, I'm gonna skip the proof for now. I'm not familiar w/ polar coordinates and all.
 
user116211
4:59 AM
@KaumudiHarikumar They are quite easy.
 
0celo7
0celo7
@SwapnilDas So what math do you know?
 
John Rennie
John Rennie
@KaumudiHarikumar do physics at uni and you will come to love polar coordinates :-)
 
user228700
@MAFIA36790 That may be but I don't have the time. Thanks for ur help :-)
 
0celo7
0celo7
@JohnRennie I think you misspelled "despise with a passion"
 
user228700
@JohnRennie Looking forward to it then :-)
 
Swapnil Das
Swapnil Das
5:01 AM
High school, tenth and a lil higher stuff. I'll link something
 
user116211
@JohnRennie I was expecting you and ACM; ACM did go for the running... hmmm.
 
Swapnil Das
Swapnil Das
 
user116211
@SwapnilDas bleh.
 
Swapnil Das
Swapnil Das
Here's my account with 'my knowledge math stuff'
 
0celo7
0celo7
@SwapnilDas Well until you learn vector calculus, GR is inaccessible. Some would say you should learn many other things before you learn GR, but it's possible with just background in vector calculus and linear algebra.
 
DanielSank
DanielSank
5:02 AM
@MAFIA36790 Not sure what you mean.
 
Swapnil Das
Swapnil Das
Exactly :P
 
TheGhostOfPerdition
TheGhostOfPerdition
@MAFIA36790 why dont you nominate yourself for the election?
 
Swapnil Das
Swapnil Das
Thanks @danielsank anyway :)
Well one other thing
10
Q: Proving $(ax+by-1)^2 \ge (x^2+y^2-1)(a^2+b^2-1)$

Swapnil Das Let $x$, $y$, $a$, $b$ be real numbers such that $a^2+b^2 \leq 1$ and $x^2+y^2 \leq 1$. Show that $$(ax+by-1)^2 \ge (x^2+y^2-1)(a^2+b^2-1)$$ I am unable to find a solution to this problem. My initial thoughts were to have a trigonometric substitution of variables, but that didn't lead me fur...

inequality
 
John Rennie
John Rennie
@SwapnilDas: did the answers to your question about zero mass give you the info you needed?
 
Swapnil Das
Swapnil Das
Yup, they gave.
But one thing still confuses, is mass a form of energy?
What are lorentzian metrics?
 
John Rennie
John Rennie
5:05 AM
@SwapnilDas yes.
 
user116211
@DanielSank You said I would learn programming. I would definitely want to. But for my university, they give each student a future plan of the courses they offer over the three years. I did check that. There was nothing but conventional physics topics and practical. Only modern thing seems to be electronics. I've not noticed any computer programming lesson. Would I have to learn it separately? That's what I meant.
 
John Rennie
John Rennie
@SwapnilDas Mass and energy are different aspects of the same thing
 
user116211
@TheGhostOfPerdition o/
 
Swapnil Das
Swapnil Das
Hmm. One answer disagrees with the fact, perhaps
 
TheGhostOfPerdition
TheGhostOfPerdition
@MAFIA36790 why not? I'd definitely vote ;)
 
Swapnil Das
Swapnil Das
5:07 AM
Mass is not energy, this is a common misconception. Mass contains energy, but that doesn't mean what you might think. Energy is not a "thing", is a quality of a thing. Like colour. You can hold a blue ball, but you cannot hold "a blue". You cannot hold energy either, there is no such thing as "pure energy" any more than there is a "pure blue". (unless you are a hooloovoo)
 
user116211
@TheGhostOfPerdition Why should I? I'm not so much matured enough to be a mod. Maybe I would think about this in the future.
 
Swapnil Das
Swapnil Das
This is what an answer says :(
 
user116211
@TheGhostOfPerdition The thing is not about the vote. I'm not competent enough for such a serious post.
 
user116211
Moderatorship is not a bed of roses, after-all.
 
TheGhostOfPerdition
TheGhostOfPerdition
@MAFIA36790 hehe true that !!
 
user116211
5:08 AM
Yes, I will be quite active in review queue as far as I think and would do my job as an editor.
 
Swapnil Das
Swapnil Das
Poll question. Physics problems: Should they be solved fast or slow? (research excluded)
 
John Rennie
John Rennie
@SwapnilDas That's plain wrong. The theory that tells us exactly how mass and energy are related is quantum field theory, and that makes it abundantly clear that the two things are equivalent.
 
Swapnil Das
Swapnil Das
Thank god. Pop Sci isn't always wrong, I suppose.
Yes and please people here have some views on the poll question ^^
Should Physics be slow like math? Or should it fast?
 
NeuroFuzzy
NeuroFuzzy
@SwapnilDas yes, very interesting question. I'll think about it and get back to you with the answer in a week.
:D
 
Swapnil Das
Swapnil Das
:D thanks for your time.
 
user116211
5:12 AM
@SwapnilDas: I would say better study the maths first; there are many important topics which you want to cover before starting actual physics. Be ahead of contemporaries. You would get enough time to study physics. No need to bother about GR and pop-sci books.
 
0celo7
0celo7
@JohnRennie It does?
What part exactly does that?
 
Swapnil Das
Swapnil Das
@mafia36790 I don't even care. Curious mind, that's all.
PhO is the first aim of my life, rest is later.
 
user116211
@SwapnilDas Physics Olympiad?
 
Swapnil Das
Swapnil Das
Yup :)
 
0celo7
0celo7
@SwapnilDas I can tell you how to study GR.
 
Swapnil Das
Swapnil Das
5:15 AM
Wohoo. But I'm still a tenth grader :P
 
0celo7
0celo7
I learned it in 11th grade.
 
user116211
Well, Physics Olympiad is good, IMO. You can be computational. But I don't think it would help you in teaching physics.
 
user116211
@0celo7 I learned QM first in 11th grade ;))
 
0celo7
0celo7
@MAFIA36790 then do my homeworks pls
 
Swapnil Das
Swapnil Das
GR in 11th grade! Seriously!
 
user116211
5:16 AM
@0celo7 I read Feynman! Not Susskind ;/
 
Swapnil Das
Swapnil Das
Did anyone of you take part in IPhO or any PhO?
 
user116211
@SwapnilDas No, But have done some problems.
 
Swapnil Das
Swapnil Das
Wut do you think, should they be solved fast or slow?
 
user116211
@SwapnilDas Depends on the problem.
 
Swapnil Das
Swapnil Das
Hmm.
If they were MCQs then?
 
user116211
5:18 AM
@SwapnilDas MCQs are generally easier than the main problems, but I can't guarantee it.
 
Swapnil Das
Swapnil Das
Because for getting to the IPhO, you need to appear an MCQ exam in my country and then also a subjective one
Ic
 
user116211
@SwapnilDas I'm in your country.
 
Swapnil Das
Swapnil Das
huh? Appeared NSEP?
 
0celo7
0celo7
Word is absolutely garbage
@MAFIA36790 Susskind?
We're using Sakurai
 
Swapnil Das
Swapnil Das
@0celo7 Do you wanna become a theoretical physicist?
 
0celo7
0celo7
5:25 AM
Haha.
No, why would I do that?
 
Swapnil Das
Swapnil Das
You have enough knowledge to be one
What do you wanna become?
 
0celo7
0celo7
I could also be a male stripper
 
Swapnil Das
Swapnil Das
:P
 
0celo7
0celo7
I have roughly the body type of a sorority girl
@BernardMeurer can confirm
 
user116211
@0celo7 oh.
 
user116211
5:30 AM
@SwapnilDas No, but as I said, we used to solve the questions.
 
user116211
@0celo7 I very much love this idea ;))
 
DanielSank
DanielSank
@MAFIA36790 If there are no courses, then you have to learn on your own. For many physicists this self-learning happens when they start doing research, e.g. in graduate school or in their first job.
 
user116211
@DanielSank Ah!! sure.
 
DanielSank
DanielSank
@MAFIA36790 It is worth your time to learn some basic python, for example.
 
user116211
@DanielSank okay.
 
DanielSank
DanielSank
5:33 AM
I am happy to help, of course, but there are so many resources online that probably you don't need it.
 
user116211
@DanielSank Sure ;))
 
user116211
WTH! @DanielSank, they indeed offer a very brief programming course to the students of Applied Physics (and Mathematics) ;/
 
DanielSank
DanielSank
6:05 AM
@MAFIA36790 Can you take the course?
 
user116211
@DanielSank I don't know; they generally don't meddle Basic science students with the applied ones; it is in the 4th or 5th semester that is at the beginning of the third year; though they are not rigid, I'm not sure.
 
user116211
I'm a bit surprised why they discriminate between us and the applied group ;(
 
DanielSank
DanielSank
@MAFIA36790 Foolishness, certainly.
^ That's a joke.
 
user116211
@DanielSank That's true ;/
 
user116211
Anyways, I'm definitely going to learn programming in the future prior to my masters @DanielSank.
 
DanielSank
DanielSank
6:16 AM
@MAFIA36790 Just so you know, one does not simply "learn programming" in the same way that one does not simply "learn math".
Programming is a vast subject.
 
user116211
@DanielSank ohh.
 
user116211
@DanielSank noted.
 
DanielSank
DanielSank
@MAFIA36790 Yes. It's useful to think of coding in the same way as math. Only years of experience, including both study and practice, will give you the wings you need to fly.
 
user116211
great!
 
user116211
I would be talking to my university then if they can allow me in their programming course in the third year.
 
Balarka Sen
Balarka Sen
6:18 AM
But we already know that coding and math are the same thing as homotopy theory, so it suffices to learn Lurie, "Higher Topos Theory".
(/homotopy type theory joke)
 
John Rennie
John Rennie
@KaumudiHarikumar: if we have some force acting on body moving around a point it's always possible to split that force into radial and tangential components, where the radial component is what we usually call the centripetal force. Circular motion is special only because the tangential component is always zero.
 
user116211
Holy crap! I asked the most number of questions in Phys.SE! Maybe I can cross 1000 ;P
 
user116211
@yuggib o/
 
yuggib
yuggib
\o
 
user228700
6:42 AM
@JohnRennie U mean uniform circular motion, right?
 
John Rennie
John Rennie
6:55 AM
@KaumudiHarikumar yes
 
user116211
7:06 AM
Do you know @JohnRennie, how much time a post takes to come in Close Votes review queue when someone votes to close or flags it?
 
John Rennie
John Rennie
7:16 AM
@MAFIA36790 No idea I'm afraid. The review queues are something of a mystery to me. Posts sometimes seem to appear in them at random.
 
user116211
@JohnRennie ohh.
 
user116211
My general notion was that if someone edits a closed post, it would go to Re-open review queue; though most of them go, I've seen someone which doesn't go also. So, yeh; review queue works mysteriously.
 
DanielSank
DanielSank
@MAFIA36790 wow
Everyone has a claim to fame.
@JohnRennie has the highest rep.
You have the most questions.
 
user116211
@DanielSank oh man, I don't think it's a credit though ;)
 
user116211
@DanielSank Anyways, here it is: data.stackexchange.com/physics/query/71706/…
 
user116211
7:26 AM
It's mostly due to I self-study and whenever I face a problem, I jot it down as a query.
 
DanielSank
DanielSank
@MAFIA36790 That's a lot of questions.
 
user116211
It has decreased a bit after I discovered the chat.
 
user116211
@DanielSank Indeed it is.
 
user116211
@DanielSank Oh! BTW, run for the mathematics; and check for the mammoth number of questions asked ;)
 
DanielSank
DanielSank
@MAFIA36790 o_O
 
John Rennie
John Rennie
7:29 AM
@0celo7 a male paint stripper possibly
 
user116211
@DanielSank Did you see that?
 
user116211
It's really a hell lot no. of questions ;P
 
user116211
@JohnRennie I would definitely want to be a cook after my academia career ;)
 
user228700
@MAFIA36790 Holy eff, that IS a lot of questions! :O
 
user116211
@KaumudiHarikumar That made my life easier.
 
user116211
8:02 AM
1
Q: Magnetic field of radially emitted alpha particles by a sphere of polonium

amnaA layer of polonium is deposited n the surface of a sphere of radius R. The metal emits alpha particles. Assume that these particles are emitted radially outward, thus forming a current. Will there be a magnetic field associated with this current?

quantum-electrodynamics
 
user116211
I've no idea but could anyone tell whether the tag quantum-electrodynamics is justified here?
 
John Rennie
John Rennie
8:51 AM
@DanielSank: I don't get what you're asking here‌​. For a massive particle the product of the de Broglie wavelength and frequency is the phase velocity.
 
user116211
Hey @JohnRennie, I just got a hate message.
 
user116211
 
user116211
When do these trolls get that my single vote doesn't close a question ;((
 
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