« first day (2366 days earlier)      last day (2556 days later) » 
00:00 - 10:0010:00 - 14:0014:00 - 16:0016:00 - 21:0021:00 - 00:00

ACuriousMind
ACuriousMind
12:00 AM
@BalarkaSen Is it I'm trying to suppress Aztec SE? :P Go ahead, what do you think?
 
peterh
peterh
@BalarkaSen nahuatl is the name of the language and it still spoken by around 2million speakers in middle America. It is probably few to start an SE site, also the nahuatl wiki is very small. Btw, they use Latin script.
 
Balarka Sen
Balarka Sen
@peterh Now there's an Aztec language enthusiast!
I knew there were some undercover Aztec experts out there somewhere
@ACuriousMind That you don't want unfounded speculations about motives of other people posted, clearly
 
peterh
peterh
@BalarkaSen I think in an ideal world everybody would know 2-3 languages simply because it has permanent positive effect to the cognitive skills :-) this is why I like small, dying languages
 
ACuriousMind
ACuriousMind
@BalarkaSen That is clearly founded speculation.
 
Balarka Sen
Balarka Sen
@ACuriousMind No, you are making an unfounded speculation about my motives now.
When I speculated that, I did not intend it to have any foundation.
 
Anonymous
12:04 AM
#BalarkaTrolls^
 
peterh
peterh
@ACuriousMind Ok, I will be more factual. Although I think saying what is my impression from the actual deeds of a person or a group of persons isn't an unfounded speculation if I can adequately explain it by facts
 
Balarka Sen
Balarka Sen
@blue These are my best 5:30 AM trolls. I think I have successfully made ACM commit an unfounded speculation.
 
ACuriousMind
ACuriousMind
@BalarkaSen That's...an interesting epistemological problem :P
 
Balarka Sen
Balarka Sen
I had a brief vision of you racking through pages of Kant, trying to solve this dilemma.
 
ACuriousMind
ACuriousMind
I would not turn to Kant to solve any dilemma, now that's unfounded speculation!
 
Balarka Sen
Balarka Sen
12:10 AM
Touche.
(Or shall I say, Touch\'e)
With that, I'm off to sleep
 
Emilio Pisanty
Emilio Pisanty
12:25 AM
You can even nest them. For a somewhat realistic example: cd `dirname \`which ls\`` = cd to the directory where the "ls" binary is located. (i.e. cd /bin since it's /bin/ls) [edit: phew, escaping that markdown is HARD] — MSalters 16 hours ago
lolz
gotta love that last bit
though actually, no it's not that hard
cd `dirname \`which ls\``
(as opposed to cd dirname `which ls`)
 
0celouvskyopoulos
0celouvskyopoulos
I'm dizzy
Too much analysis
 
Pichi Wuana
Pichi Wuana
12:56 AM
Hello
 
Anonymous
1:28 AM
@PichiWuana Hi
 
Koolman
Koolman
2:59 AM
@paracetamol link ?
 
Yashas
Yashas
@paracetamol I'm not from Bengal
 
Koolman
Koolman
And I am also not from there .
 
0celouvskyopoulos
0celouvskyopoulos
I am.
আমি বাংলার থেকে এসেছি
@SirCumference
আপনি আমার শিক্ষক হতে প্রস্তুত
 
Sir Cumference
Sir Cumference
@0celouvskyopoulos না আমি না
 
0celouvskyopoulos
0celouvskyopoulos
Oh really
 
Yashas
Yashas
3:15 AM
 
Anonymous
@0celouvskyopoulos My goodness :D
 
Yashas
Yashas
that doesn't look like Hindi
 
Anonymous
You wrote it perfectly :P
 
Anonymous
Google Translate is working properly it seems
 
0celouvskyopoulos
0celouvskyopoulos
@Yashas That guy sounds like a jerk
 
Yashas
Yashas
3:19 AM
:D
 
Bernardo Meurer
Bernardo Meurer
@dmckee What kind of stress causes a professor to do all his material in Comic Sans?
 
Sir Cumference
Sir Cumference
@BernardoMeurer Woah
 
Anonymous
 
Anonymous
When you start showing plastic behaviour @BernardoMeurer
 
Anonymous
That's the necessary stress :P
 
Yashas
Yashas
3:25 AM
 
Bernardo Meurer
Bernardo Meurer
It's crazy
@Yashas I will! After I pass the class :P
 
Anonymous
Make sure you don't reach fracture point :D Or else you won't be able to give the exam :P
 
Bernardo Meurer
Bernardo Meurer
Why is the acceleration of gravity lower on the equator than on the north pole (assuming a perfectly spherical earth)?
 
Sir Cumference
Sir Cumference
@Yashas I'm in the minority who actually likes comic sans
 
Bernardo Meurer
Bernardo Meurer
@SirCumference If by minority you mean monster...
 
Sir Cumference
Sir Cumference
3:27 AM
It's like chalkboard writing
 
Anonymous
@BernardoMeurer Due to the $w^2R$ component of the centripetal/centrifugal force...whatever you call it....
 
Bernardo Meurer
Bernardo Meurer
3:49 AM
@blue Ah, I see
If I try and compute the coriolis force for the earth
will $v$ be its linear velocity?
 
Anonymous
Here is good lecture on Coriolis force:youtube.com/watch?v=UEPThmlk9As
 
Anonymous
 
Anonymous
@BernardoMeurer
 
Anonymous
@BernardoMeurer I don't understand what you mean by $v$
 
Anonymous
Remember that Coriolis force is not a real force
 
Anonymous
4:33 AM
@Yashas On which site is the result being declared?
 
Anonymous
On the official site nothing is updated
 
Yashas
Yashas
5:07 AM
You have to wait.
 
Anonymous
@Yashas I am waiting.
 
Anonymous
They haven't updated anything -_-
 
Yashas
Yashas
Their office just opened 30 mins ago lol
 
Anonymous
All the newspapers said by 10 o clock the results would be out....
 
Yashas
Yashas
.
I don't want the results to be out -,-
 
Anonymous
5:09 AM
lol,why? :P
 
Anonymous
You'll get good marks only :)
 
Yashas
Yashas
I don't want to know :P
 
Anonymous
Did they announce any bonus marks?
 
Yashas
Yashas
nope
 
Anonymous
wtf
 
Yashas
Yashas
5:11 AM
they did not even announce the answer key
-,-
 
Anonymous
6 questions were wrong
 
Yashas
Yashas
We are in India :P
then somebody will rage and move the court
They will publish the results
Last time my high school exam board gave half the marks in practicals
and it screwd my rank
they fixed it later
and that is why you see 0.1 or 0.02 in closing ranks
 
Anonymous
If they don't give bonus I'll go to their office in Delhi and shoot them :P Won't even bother to move to the court, lol
 
Anonymous
Oh I forgot, I don't have a gun :P
 
Anonymous
@Yashas They did publish an answer key I think
 
Anonymous
5:15 AM
But that had many mistakes
 
Yashas
Yashas
That was the wrong one
before it was challenged
 
Anonymous
Yeah^
 
Yashas
Yashas
Where is the announcement that JEE results will be released today?
other than newspapers
it could be a hoax
some newspaper publishes and others copy :P
 
Anonymous
Yeah, all the newspapers made a joint hoax to fool us. Possible :D. But April fool day is over.....
 
Yashas
Yashas
They copy each other.
 
Anonymous
5:20 AM
They showed on NDTV also...
 
Anonymous
And all the news channels
 
Anonymous
Maybe someone hacked into their server and deleted all the results :P That's why....
 
Anonymous
@Yashas Check this site. How did they get the screenshot? :O
 
Anonymous
Okay in 2016 it was published at 5pm.
 
Yashas
Yashas
@blue fake
 
Anonymous
5:28 AM
@Yashas Yeah, I guess so. So I think it will be at about 5 pm.
 
user228700
6:16 AM
@blue Yep. Around 4-5.
 
user228700
Morning, everybody!
 
Anonymous
@Kaumudi.H How do you know?
 
John Rennie
John Rennie
Morning!
 
Sir Cumference
Sir Cumference
6:38 AM
Anyone here speak Spanish?
 
John Rennie
John Rennie
 
Sir Cumference
Sir Cumference
@JohnRennie Wrap your head around the fact that "nada" can mean either "nothing" or "anything"
 
DanielSank
DanielSank
I have a PhD in physics and I've never understood Coriolis force o_O
 
John Rennie
John Rennie
@SirCumference :-) But then English isn't with its illogicalities too.
 
Yashas
Yashas
The first time I saw Coriolis force was in the polar coordinates equation of acceleration for rotating objects
you get some magic term when you differentiate the velocity and it took a while to figure that out
 
Sir Cumference
Sir Cumference
6:53 AM
@JohnRennie Yup. English is easily the most confusing language I've ever seen...speaking as a native
It takes from so many languages
 
John Rennie
John Rennie
@SirCumference which is precisely what makes the English language such fun to play with.
 
Yashas
Yashas
I find English exam harder than Physics/Chem/Math exam.
too much literature to read
 
John Rennie
John Rennie
Though no doubt that applies to many languages. It's just that English is the only language I know well enough to understand all the nuances.
 
Yashas
Yashas
I doze off
 
Slereah
Slereah
What's a good name for QFT as it is done for the most part
Like perturbative QFT + quantization rules + renormalization, etc
As opposed to AQFT or other rigorous schemes
 
John Rennie
John Rennie
6:56 AM
@Slereah HFTB
Hope For The Best :-)
 
Slereah
Slereah
Gibbons (the physicist, not the ape) has a nice list of rough rules for that
It's basically a Hilbert space, a spacetime, a set of field operators, wave equations that the operators satisfy, commutation relations, rules for constructing a Fock space and rules for renormalization
 
Naveen Balaji
Naveen Balaji
Hey guys! Please help me out on this one, if you got time.
3
Q: On reducing complex ODE's to Bessel's form

Naveen BalajiI am trying to reduce the following ode to bessel's ode form and solve it: $$x^{2}y''(x)+x(4x^{3}-3)y'(x)+(4x^{8}-5x^{2}+3)y(x)=0\tag{1}$$ I tried to solve it via the standard method,i.e., by comparing it with a generalised ode form and finding the solution from then on. The general form (as giv...

differential-equations bessel-functions frobenius-method
 
Sir Cumference
Sir Cumference
> If you liked it then you should have moved a mass inside its Roche limit.
New favorite quote
 
Anonymous
@DanielSank You're joking, right? =P
 
Anonymous
@SirCumference Cool one :D
 
Anonymous
7:10 AM
@Yashas That's just another pseudo accn like the centrifugal force
 
Anonymous
It's good to think of it as: You stop the earth from rotating (imagine) and yet you see all the objects moving in the same way w.r.t to the earth
 
Anonymous
So a Coriolis force must be taken in account just like the Centrifugal force
 
Anonymous
Imagining it that way helps a lot :)
 
Sir Cumference
Sir Cumference
@JohnRennie Dialects are neat too. "One man's trash is another man's rubbish"
 
DanielSank
DanielSank
@blue Why would you think that?
 
Anonymous
7:14 AM
@DanielSank After seeing your 10k+ rep it is hard to believe :P
 
Anonymous
And your anwers on the site
 
Anonymous
Some of the answers are simply superb
 
Sir Cumference
Sir Cumference
Wait...is the proverb "One man's trash is another man's treasure" also a thing in other countries?
Because "trash" is usually a north american word
 
user228700
@blue Uh, I wrote Main last year as well.
 
Anonymous
@Kaumudi.H Oops :P
 
user228700
7:17 AM
Jeez. 0celouvskyopoulos?!?!
 
Sir Cumference
Sir Cumference
I thought there was a limit to how quickly you could change your name
He's changing his every other week
 
Anonymous
Ocelopotus would be better :D
 
paracetamol
paracetamol
^ Wasabi
...sounds nice :3
 
John Rennie
John Rennie
@SirCumference 0cilleting?
4
 
paracetamol
paracetamol
:D
@JohnRennie I was going to say he was "vacillating", darn...that never occurred to me XD
 
John Rennie
John Rennie
7:22 AM
I suppose it should reall be 0celloting - I got the e in the wrong place.
 
paracetamol
paracetamol
^ To late ;)
 
user228700
@JohnRennie Ah, count on you to bring in the puns! :-P
 
John Rennie
John Rennie
@Kaumudi.H second lowest form of humour :-)
 
Sir Cumference
Sir Cumference
@paracetamol Gotta ask, why'd ya name yourself after a medication?
 
Anonymous
He causes a headache....
 
Anonymous
7:24 AM
The image is a relief
 
paracetamol
paracetamol
@blue 0:)
 
John Rennie
John Rennie
@SirCumference Ah, I thought for a moment you were referring to Rennies.
 
paracetamol
paracetamol
32 secs ago, by blue
He causes a headache....
 
Sir Cumference
Sir Cumference
@JohnRennie Oh dang. I missed my opportunity for a pun
@paracetamol Ok.
 
paracetamol
paracetamol
O_o?
 
John Rennie
John Rennie
7:26 AM
@SirCumference sadly no relation, or I'd be a lot richer than I am.
 
Sir Cumference
Sir Cumference
Is there a way to just transfer the info from a textbook into my brain?
 
paracetamol
paracetamol
@SirCumference I find Pharmacology and Biochem. interesting. Also, they keep pinging me as "@para" at The Periodic Table, so "@paracetamol" sounded fine ;)
 
user228700
@JohnR: Laptop is doing just fine, BTW :-)
 
John Rennie
John Rennie
@Kaumudi.H Good news. Well ish - I was having fun trying to figure out ways to circumvent the Indian customs in case i had to send a replacement.
@SirCumference yes, but it involves mincing both
 
user228700
Haha :-) No, there is no need of a replacement. This one is just fine <3
 
Sir Cumference
Sir Cumference
7:29 AM
@JohnRennie I think I'll just build a machine to transfer book data into audio form
Much easier to follow
Won't be up at 3:30 am
 
paracetamol
paracetamol
@JohnRennie "Circumventing" Indian Customs isn't a big deal I do it all the time ^_^
 
Phase
Phase
I wish sleep learning wasn't nonsense
 
John Rennie
John Rennie
In general though ... Suppose I want to send some random Hindustani some electronic gadget. I could put it on ebay at a very low buy it now price then get them to buy it. Then I'd printout the ebay listing as proof of the value. That would bring the import duty down.
 
Anonymous
@SirCumference That's why I stopped using books. Books take a long time to be read. Use university lecture courses.
 
Anonymous
They are far easier to grasp
 
Sir Cumference
Sir Cumference
7:31 AM
@blue Yeah but sometimes the lectures take hours and don't cover what I need to know atm
 
John Rennie
John Rennie
@paracetamol Details?
 
paracetamol
paracetamol
^ Will you tell on me? ;)
 
Anonymous
@SirCumference Ah, well that depends on the course you subscribe for :P My ones cover my syllabus perfectly :)
 
Anonymous
Then I just do the problem sets
 
John Rennie
John Rennie
@paracetamol Naturally I will shop you to the Indian authorities for the vast reward they offer :-)
 
Sir Cumference
Sir Cumference
7:32 AM
@blue I'm doing galaxy formation right now and I need to remember what Fourier transforms had to do with it
This book is absoultely useless
 
user228700
@JohnRennie Ah yes yes :-)
 
Sir Cumference
Sir Cumference
I guess I'll speak with the prof
 
paracetamol
paracetamol
@JohnRennie Handful of roasted peanuts = "Vast reward"? I guess you aren't that rich ;D
 
John Rennie
John Rennie
@paracetamol I am genuinely interested to know how I can send stuff to friends in India without the customs slapping a large import duty on it.
 
Sir Cumference
Sir Cumference
Oh, that reminds me. Any idea how to pronounce "Chandrasekhar"?
 
user228700
7:33 AM
@JohnRennie Hey, it wasn't so bad last time, was it?
 
Anonymous
Can't you sell it on amazon or ebay ?
 
Anonymous
The Indian will buy it
 
John Rennie
John Rennie
@Kaumudi.H that's a short memory you have :-)
 
paracetamol
paracetamol
@JohnRennie Oh...my list just includes firecrackers (precursors and such...)
 
John Rennie
John Rennie
@Kaumudi.H It was like having your toenails pulled out - very slowly :-)
 
user228700
7:34 AM
Right, of course. But the duty wasn't too bad, was it?
 
John Rennie
John Rennie
@paracetamol if you've found a way to smuggle explosives into India I strongly recommend you don't publish it here ;-)
 
Sir Cumference
Sir Cumference
@JohnRennie Sorry, can I ask you a quick question?
 
John Rennie
John Rennie
@Kaumudi.H only because I lied about the value and managed to lie convincingly :-)
 
user228700
@SirCumference The video that u linked before does it well.
 
John Rennie
John Rennie
@SirCumference yes of course
 
user228700
7:35 AM
@JohnRennie Ah, yes!
 
paracetamol
paracetamol
@JohnRennie Who said I was smuggling explosives into India?
 
Sir Cumference
Sir Cumference
@JohnRennie I'm done with cosmology for now but I'm still confused — gravity can't affect the peculiar velocities of any galaxies in a universe that perfectly upholds the cosmological principle, right? Then if it has no effect on such a universe, why would it cause a collapse in a closed universe?
 
John Rennie
John Rennie
2 mins ago, by paracetamol
@JohnRennie Oh...my list just includes firecrackers (precursors and such...)
 
paracetamol
paracetamol
^ It goes both ways ._.
In and out ;P
 
John Rennie
John Rennie
@paracetamol I doubt exporting explosives is viewed much more favourably :-)
 
paracetamol
paracetamol
7:38 AM
@JohnRennie By the way, Indian firecrackers are excellent. I mean, sure, there's a chance you'd get your hands blown off, but you definitely get a "bang for your buck" ;)
^They're ridiculously loud :D
 
Phase
Phase
Idk how much customs in India is, but I recently had to pay like 100 quid for customs from Korea
 
paracetamol
paracetamol
O_O
 
John Rennie
John Rennie
@SirCumference In an isotropic homogeneous universe no inhomogeneities can develop. That is certainly true.
 
paracetamol
paracetamol
@Phase What the heck were you even moving?
 
John Rennie
John Rennie
@SirCumference But that doesn't mean the density cannot change - it just means that the change needs to be isotropic and homogeneous as well.
 
Phase
Phase
7:40 AM
Wasn't even that big, I guess it was delicate / electronic although it didn't have batteries so idk.. It was annoying
It was an arcade stick
 
John Rennie
John Rennie
@SirCumference And that's exactly what the FLRW metric describes.
 
Sir Cumference
Sir Cumference
@JohnRennie So gravity can contract space (i.e. decrease the scale factor)?
 
John Rennie
John Rennie
@SirCumference Well you need to be careful about the word gravity.
 
Sir Cumference
Sir Cumference
@JohnRennie That thing caused by mass, energy, momentum, etc.
 
John Rennie
John Rennie
The point is that a time independent isotropic homogenous universe does not satisfy the Einstein equation.
 
paracetamol
paracetamol
7:42 AM
Russian...fancy language, that ._.
 
John Rennie
John Rennie
@SirCumference The Einstein equation tells us that an isotropic homogenous universe is necessarily time dependent.
 
Slereah
Slereah
@JohnRennie it does, it's the Einstein universe!
 
Sir Cumference
Sir Cumference
@Slereah Which is unstable
 
Slereah
Slereah
Or any maximally symmetric spacetime
 
John Rennie
John Rennie
@Slereah OK, OK, no cosmological constant allowed
 
Slereah
Slereah
7:44 AM
But our universe has one!
 
John Rennie
John Rennie
In any case the time independent solution is unstable to any perturbations.
 
Sir Cumference
Sir Cumference
Yeah
 
Slereah
Slereah
Please don't perturb the universe
 
Sir Cumference
Sir Cumference
My biggest confusion is how gravity works here. If it can decrease the scale factor and thereby cause recessional velocities to be $< -c$, why don't we notice objects seemingly attracting faster than light?
If that makes any sense
 
John Rennie
John Rennie
There are two components to determining the evolution of the universe i.e. the time dependence of the metric - (1) the dynamics and (2) the initial conditions.
 
Sir Cumference
Sir Cumference
7:47 AM
right
 
John Rennie
John Rennie
The initial conditions for the FLRW universe are that it is expanding.
Kind of obvious really since it started at a singularity - it could hardly be contracting :-)
 
Sir Cumference
Sir Cumference
@JohnRennie And the dynamics are, for example, the value of $\ddot{a}$?
 
John Rennie
John Rennie
Anyway that means it was expanding everywhere so all relative velocities were +ve, and as you say they will be greater than $c$ if you're farther away than the horizon.
@SirCumference Yes. Initially $\dot{a} \gt 0$ and $\ddot{a} \lt 0$
 
Sir Cumference
Sir Cumference
@JohnRennie Hmm...but isn't $\ddot{a}$ determined by the initial values of $w$ and $k$?
 
John Rennie
John Rennie
As we approach the singularity $\ddot{a} \rightarrow \infty$ so we don't really have an initial condition in the sense of values for $\ddot{a}$ etc at $t=0$.
But the density and equation of state of the stuff in the universe determines the subsequent evolution of $a(t)$.
I wouldn't say it was determined by the initial values of $w$ and $k$ because they in turn depend on the densities and equations of state of the stuff in the universe.
 
Sir Cumference
Sir Cumference
7:54 AM
K
 
John Rennie
John Rennie
I can't remember where we came in with this now ...
 
Sir Cumference
Sir Cumference
@JohnRennie Gravity and the scale factor
 
John Rennie
John Rennie
OK - gravity. All comoving observers are in free fall so they feel no gravitational force. Where then is your gravity?
 
Sir Cumference
Sir Cumference
Right, that makes sense
There shouldn't be any effect of gravity
 
John Rennie
John Rennie
The answer is that in order to keep a fixed proper distance from some comoving object you need to accelerate, and the force you feel as a result is the gravitational force.
 
Phase
Phase
7:56 AM
Gravity is just an artifact of reference frames anyway isn't it? It's a fictitious force I think
 
John Rennie
John Rennie
Because if you don't accelerate your distance to the comoving object will change in time in proportion to $a(t)$
 
Sir Cumference
Sir Cumference
@JohnRennie Oh!
Wow, that actually makes sense
So wait, I might either be extremely tired or understanding this correctly
Wait, no, I think I made some nonsense realization
 
John Rennie
John Rennie
@Phase Careful - there is nothing fictitious about the force my chair is currently applying to my bum!
 
Joshua Lin
Joshua Lin
but everything is fictitious
its all just in your head
 
John Rennie
John Rennie
@JoshuaLin I refute him thus
 
Sir Cumference
Sir Cumference
8:02 AM
@JohnRennie Wait, in order to keep a fixed proper distance? Why would that happen in an expanding universe? The proper distances should be increasing, right?
It's 4am, excuse me if my brain isn't working
 
user228700
@SirCumference Ah, still having trouble sleeping, are you?
 
Sir Cumference
Sir Cumference
@Kaumudi.H Yep. Maybe I should rename myself "melatonin" in the same fashion as @paracetamol
 
John Rennie
John Rennie
@SirCumference Right now I am keeping a fixed proper distance from the centre of the Earth. In order to do this I need to accelerate. Specifically I need to accelerate at 1g, and that acceleration is provided by the surface of the Earth.
 
user228700
@SirCumference I second this idea.
 
paracetamol
paracetamol
@Kaumudi.H I "second" it too ;)
@SirCumference Go ahead @Pies ;)
 
John Rennie
John Rennie
8:04 AM
@SirCumference if I were to stop accelerating, e.g. by jumping off a cliff, I would feel no gravitational force and my proper distance to the centre of the Earth would be time dependent.
Does that make sense so far?
 
Sir Cumference
Sir Cumference
Right, I would need to accelerate away from earth
 
John Rennie
John Rennie
The direction of the acceleration is away from the centre of the Earth yes. Remember that it's possible to accelerate and still remain motionless.
2
Q: How can you accelerate without moving?

Mike DoonseburyI know this question has been asked in other forms, generally regarding the balance of forces. This time I want to focus on motion. I've got a laser accelerometer on my desk. It tells me that I'm accelerating at 9.8 m s-2. For the first experiment I'm travelling in space. I pick a nearby sta...

relative-motion
 
Sir Cumference
Sir Cumference
Well we would be motionless relative to Earth
 
user228700
@JohnR: Send me a cycle. Oh how I long to go cycling around these parts ._.
 
user228700
(Kidding. Please don't)
 
John Rennie
John Rennie
8:08 AM
@SirCumference anyway, the same applies to an FLRW universe. If I do not accelerate then my proper distance to other comoving observers changes with time in a way proportional to $a(t)$. Yes?
 
Sir Cumference
Sir Cumference
@JohnRennie Yeah
 
John Rennie
John Rennie
@Kaumudi.H I thought you had a pushbike?
@SirCumference so if I wish to stay a constant proper distance from some comoving reference point I must accelerate.
 
user228700
Ah, but I'm not home, remember? :-)
 
John Rennie
John Rennie
I could do this by firing my rocket engine, or I could put a (very long!) rigid object between me and the reference point then stand on the object.
 
Sir Cumference
Sir Cumference
@JohnRennie Yes. I guess my head's working better
 
John Rennie
John Rennie
8:11 AM
@Kaumudi.H ah of course. I wonder if Amazon do emergency pushbike shipments :-)
 
user228700
:-) Two years ago, someone let me borrow theirs and it was the most wonderful few afternoons. This place is quite beautiful.
 
John Rennie
John Rennie
It's about 100 rupees to the pound sterling isn't it?
 
user228700
I went all the way up to a whole other town--up a hill and all, by the side of a vast wheat field.
 
Yashas
Yashas
1 UK pound = 83 INR I think
 
user228700
Spotted a herd of peacocks and everything!
 
paracetamol
paracetamol
8:13 AM
@JohnRennie Quit rubbing it in! ಠ_ಠ
 
John Rennie
John Rennie
Is the collective noun for peacocks a herd?
 
Sir Cumference
Sir Cumference
@JohnRennie Well, I can accept that gravity causes the scale factor to decrease. But, say we're an observer. Directly in front of us is an astronaut, and directly in front of the astronaut is a black hole.
 
user228700
Nope. Just Googled it and it's muster / pride.
 
Balarka Sen
Balarka Sen
I frequently use pack of people.
 
Sir Cumference
Sir Cumference
Would the astronaut seem to approach the black hole faster than $c$, from our point of view?
 
Anonymous
8:14 AM
@BalarkaSen I use bunch of people
 
Balarka Sen
Balarka Sen
That's technically the right word.
 
Anonymous
My English teacher says it's wrong :P
 
Balarka Sen
Balarka Sen
I stole it from Burroughs. "a baying pack of people" is a famous quote.
Meh who cares @blue
 
user228700
My grandpa won't even let me use his scooter ._.
 
John Rennie
John Rennie
@SirCumference depends what you mean by speed. If you mean the coordinate velocity i.e. $dr/dt$ where $r$ is our radial coordinate and $t$ is our time then no the infall speed peaks at about 2/3$c$ then falls to zero as the astronaut approaches the event horizon.
 
Yashas
Yashas
8:16 AM
@BalarkaSen Relatives and parents who are worried about quarter mark.
 
Balarka Sen
Balarka Sen
 
John Rennie
John Rennie
This has been discussed in lots on questions on this site.
 
Balarka Sen
Balarka Sen
@Yashas Clearly you shouldn't use bunch in exams. A group of people should be fine.
"bunch" is perfectly ok when talking English and not writing exams :P
 
John Rennie
John Rennie
rabble?
 
Yashas
Yashas
I just guessed the JEE Main result page even before it was officially out lol
 
John Rennie
John Rennie
8:18 AM
A rabble of physicists
 
Anonymous
I just remember I need to learn English antonyms and synonyms for bitsat :/ Ugh!
 
paracetamol
paracetamol
@JohnRennie It's not (necessarily) a riot ;D
 
Sir Cumference
Sir Cumference
@JohnRennie Huh...but clearly I'm misunderstanding something. If gravity can cause the scale factor to decrease on the largest scales, and thereby cause recessional velocities to be $< -c$, then why wouldn't the answer to my question be "yes"?
 
paracetamol
paracetamol
@blue Try Baron's for SAT ._.
 
Anonymous
@paracetamol BITSAT
 
Anonymous
8:19 AM
Not SAT
 
Yashas
Yashas
Brought to you by National Informatics Centre

JEE APEX BOARD SECRETARIAT
JOINT ENTRANCE EXAMINATION (MAIN) - 2017 RESULT
Access denied, pl. click here to visit the site http://results.gov.in
fail
 
Balarka Sen
Balarka Sen
JEE main results come out today?
 
Yashas
Yashas
but this will be the result link when it is officially out
 
John Rennie
John Rennie
@SirCumference it's just terminology. To me gravity means a gravitational force. If there are no gravitational forces there is no gravity.
 
paracetamol
paracetamol
@blue I HEARD YOU THE FIRST TIME. The book in question, also has a list of phrases and whatnot, try getting your hands on it ;P
 
John Rennie
John Rennie
8:20 AM
Spacetime curvature and gravity aren't the same thing just with different names.
 
Yashas
Yashas
@BalarkaSen Yes
 
paracetamol
paracetamol
We use it for the JIPMER test ._.
 
John Rennie
John Rennie
Anyway i have to get back to work. See you all in a few hours.
 
Sir Cumference
Sir Cumference
@JohnRennie All right, thanks
Imma head to sleep. 'Night guys
 
Balarka Sen
Balarka Sen
lol get screwed. good luck though.
 
paracetamol
paracetamol
8:21 AM
@JohnRennie o/
 
Anonymous
@paracetamol I have the book. I just don't feel like reading :P I learnt a few new words yesterday like "brainwave" and "marooned"
 
Yashas
Yashas
@paracetamol We use it for Collegeboard SAT :d
 
Anonymous
I am too lazy
 
Anonymous
I'm indolent
 
paracetamol
paracetamol
Sigh
 
Anonymous
8:21 AM
Ah, I'm learning synonyms
 
Anonymous
I'm indolent :P
 
Anonymous
Yipee
 
Balarka Sen
Balarka Sen
@blue My favorite word is "axaxaxax mlö"
 
paracetamol
paracetamol
@blue No you're impotent impertinent
 
Anonymous
@BalarkaSen lol, what's that?
 
Balarka Sen
Balarka Sen
8:23 AM
IIRC it means "to moonate"
 
Anonymous
@paracetamol -_-....
 
Balarka Sen
Balarka Sen
That is to say, the adjective for when the moon rises.
 
Anonymous
What does this mean "A perplexed person needs classification"? It was in the book. Didn't understand!
 
paracetamol
paracetamol
It means he's gotta be tickled ._.
 
Anonymous
What does classification mean in this context? :P
 
paracetamol
paracetamol
8:24 AM
Tickles @blue
 
Anonymous
8:35 AM
@paracetamol I'm looking for some insults to hurl at you from my new english book...but they seem to have put in only the nice words :/
 
Anonymous
Ah, finally I found one: "salacious"
 
Phase
Phase
That's harsh, what's up? Feeling blue?
 
Anonymous
@Phase Lol, I'm trying to learn new English words for an upcoming test
 
Phase
Phase
Just random words?
 
Anonymous
No, a list of 500 new words
 
Phase
Phase
8:39 AM
oh
Rote learning is so boring though
 
Anonymous
Which are frequently asked in the test
 
Anonymous
@Phase Yeah, that's why I'm learning the bad words first :P They are easier to learn
 
Phase
Phase
Well, good luck with the test
 
Slereah
Slereah
8:52 AM
So I ordered the particle data group book 3 months ago
Still no news!
 
Phase
Phase
9:02 AM
Well yeah I imagine it's just got a lot of data in it, if you want the news you should buy a newspaper [upside down question mark]
 
Slereah
Slereah
9:13 AM
It's not the first time I try to order it
It is slightly mysterious how you're supposed to do it
you can't actually buy it
Send an email to the people in charge
Hopefully they'll tell me how to get that bloody book
 
00:00 - 10:0010:00 - 14:0014:00 - 16:0016:00 - 21:0021:00 - 00:00

« first day (2366 days earlier)      last day (2556 days later) »