The h Bar

user228700

16:07

@blue What's high school, then?

SBM

High School

Anonymous

@Kaumudi.H 11 and 12.

user228700

I see.

SBM

I'm in HighSchool

Anonymous

@SBM 12?

user228700

16:08

Middle-school was 6th, 7th and 8th in my school and 1-5 was primary.

SBM

Yes

12th has just begun

Anonymous

@SBM CBSE?

SBM

ISC

Anonymous

@Kaumudi.H Oh, we used to call 1-2 as transition and 3-7 as primary..

Anonymous

It actually differ state to state

Anonymous

16:10

@SBM Nice to see you here :-)

user228700

3 to 7 was primary?! Jeez.

SBM

Yes

Anonymous

@Kaumudi.H Hehe. I find it a bit strange too :-)

Anonymous

@SBM So, what subjects you have?

Anonymous

PCB or PCM?

SBM

16:11

PCM Computer English

Anonymous

@SBM Engineering? =P

SBM

Yes

user228700

Ah, the new squad is assembling: Swapnil Das, Fawad, SBM...

Anonymous

@Kaumudi.H Ahhh, yet another JEE guy...lol

Anonymous

We need to warn him about the prevalent hate against JEE in this room =P

Anonymous

16:14

@Kaumudi.H Yes, the next batch is coming up!

Anonymous

omg....@0celouvsky bad news!

user228700

Haha, @0celouvsky: U're doomed, man.

Anonymous

h bar ki hawa me JEE hai sahib...hamari saanse toh rokh loge...lekin iss hawa ko kaise rokoge ?

Anonymous

lol

user228700

x'D That's excellent!

Yashas

16:16

@SBM JEE Preparation

user228700

I'mma star that seeing as there are at least 6-7 of us here who do speak Hindi.

user228700

@blue: Neat edit :-P

Anonymous

I'm laughing maniacally now

Anonymous

=D

user228700

:-)

user228700

16:21

I hope @0celouvsky doesn't feel like we are hijacking this chat! :-) It's all in good fun, mate.

ACuriousMind

@blue What does that mean?

Fawad

@ACuriousMind it's shayiri made by him.

ACuriousMind

Interesting, but not an answer to what that means :P

Fawad

@ACuriousMind it's difficult to convert,hope @blue can do it for you

Anonymous

16:43

@ACuriousMind "It means JEE is in the air. Our breaths can be stopped but how will you block the air"? . It is a modification of a dialogue from a famous movie =P

Anonymous

@Fawad Not really a shayiri =D

ACuriousMind

I see, thanks :)

Sir Cumference

17:05

@0celouvsky @BernardoMeurer Wait wth happened to obe

chat.stackexchange.com/users/258016/obe

He changed his name to "fml" and now his Physics SE profile is gone

"Page Not Found"

Koolman

@blue Kya baat

Waah Waah !!!

Anonymous

@Koolman bows

Koolman

lol

Sir Cumference

@Koolman How was the JEE btw?

Koolman

Which movie

Anonymous

17:15

@Koolman wut? which one?

Koolman

@SirCumference It is on 21may

Sir Cumference

@Koolman Wait huh?

Koolman

and jee main was good

Sir Cumference

Ooohhh

That's good to hear :)

Koolman

@blue Thay dialogue

Anonymous

17:16

@Koolman That is not even a dialogue =P

Koolman

@SirCumference actually the main exam is jee advance

@blue then you made it

Anonymous

@Koolman yep

Koolman

salute

Jaime Gallego

@Sir chat.stackexchange.com/transcript/message/36473755#36473755

Sir Cumference

Woah wtf

@JaimeGallego Was that before or after he changed his name to "fml"?

Jaime Gallego

17:23

After. We confirmed it was him afterwards.

Sir Cumference

That was out of nowhere...

Anonymous

fml is an abbreviation for "f*** my life". That's.....alarming!

Anonymous

I hope he is alright.

Sir Cumference

Well he was kind of upset the days before, about "not being good at anything"

Anonymous

@SirCumference He is suffering from depression perhaps. Someone should try to contact him.

Sir Cumference

17:25

I don't know if anyone other than @0celouvsky has his contact info

@Kaumudi.H What'd he say? .-.

It sounds so cool to be bilingual

Anonymous

@SirCumference I explained it. Scroll down a bit...

Sir Cumference

Oh...I can't read

Anonymous

46 mins ago, by blue

@ACuriousMind "It means JEE is in the air. Our breaths can be stopped but how will you block the air"? . It is a modification of a dialogue from a famous movie =P

user228700

@SirCumference I'm not bilingual, man. I can read and write English, Hindi and Malayalam. While I can't read or write Tamil, I can certainly speak it.

Anonymous

@Kaumudi.H Tetralingual :D

user228700

17:31

Sort of, yes :-)

Sir Cumference

@Kaumudi.H Multilingual is even better

I've been planning to learn a new language. Any suggestions?

Anonymous

@SirCumference For what purpose?

Sir Cumference

Which language to learn

user228700

@blue Oh what the heck! I was under the impression that you'd written that yourself!

Sir Cumference

@blue For fun. I like learning new ones. :)

Anonymous

17:32

@Kaumudi.H Really? =P

Anonymous

I thought you'd know it

Sir Cumference

So far I'm semi-fluent in Spanish, and I already know English

user228700

@blue No, I didn't know for I don't watch Bollywood movies.

Koolman

How can we find speed of stationary wave from its equation

Anonymous

@SirCumference Are you interested in South Asian languages ?

Sir Cumference

17:34

@blue Those sound particularly difficult...

user228700

@blue ...which is why I said "That's excellent" -_-

Anonymous

@SirCumference They are, indeed! But you'll be able to understand the lyrics of many nice songs :-) Otherwise no use learning them....

Sir Cumference

True. Is Hindi tough to learn?

Anonymous

@Kaumudi.H Atleast give me some credit for modifying it to fit the situation =P

user228700

@blue What modifying? U changed one word!

Koolman

17:36

Try to learn SANSKRIT (the best language)

Anonymous

@Kaumudi.H Well. More than 1 word =D

user228700

It might be deemed as the best language but it's practically useless for an American to learn.

Sir Cumference

@Koolman Yeah right after I get hieroglyphics down ;)

Anonymous

@Kaumudi.H You can take back your "that's excellent" comment :-)

Sir Cumference

In seriousness I'm considering German, Russian, and the Romance languages, but I'm open to something entirely different

user228700

17:39

And bro, don't ask us if Hindi is tough to learn; we've all (presumably) learned it from our childhood. You should ask an American who has learned Hindi.

Koolman

How can we find speed of stationary wave from its equation @blue @Yashas

Sir Cumference

@Kaumudi.H Ok, better question: is it really different from English?

user228700

@blue Eh, no need :-)

Anonymous

@Koolman $w=2\pi f$ and $k=2\pi/\lambda$

user228700

@SirCumference In all sorts of ways, yes!

Anonymous

17:40

and v is f times lambda...

Sir Cumference

Oof, I'll look into it

@blue LaTeX plz

Anonymous

@SirCumference I'm lazy..

Sir Cumference

@blue Two $s...

user228700

@Sir: Have u been reading the book?

Sir Cumference

@Kaumudi.H Once I get through my tests, I will. :/

It arrived at the worst time

Koolman

17:41

Thanks @blue

user228700

They're still not over?! What the heck!

Anonymous

@Kaumudi.H who is saying ^

Anonymous

lol

user228700

:-P That's different.

user228700

(Somehow)

0celouvsky

17:42

@SirCumference wot

Sir Cumference

Oh wait...

You said you had Mafia's contact info, not obe's...

D:

0celouvsky

I have both

Mafia did not respond

and obe wants to be left alone

Jaime Gallego

@SirCumference Russian culture is indeed quite interesting.

My only knowledge of Cyrillic is... well, I was once so bored in the shower I started to use a shampoo bottle as a Rosetta stone.

True story

Anonymous

@JaimeGallego How does one get "bored" in the shower? I'm suspicious... :D

Jaime Gallego

Oh goshdarn it

The instructions were both in Russian and Spanish

Anonymous

17:49

I like the Russian accent

Anonymous

Don't understand any of it, though..

0celouvsky

@ACuriousMind That...seems obvious. But they say the proof involves the functoriality of the mapping $A\mapsto (B,\phi)$, where again $\phi:A\to B$ is the canonical embedding.

Sir Cumference

@JaimeGallego Puedo ayudarte con el español

Jaime Gallego

Incidentally, I am Spanish :D

Sir Cumference

Oh wow, really?

¿De donde eres?

Jaime Gallego

17:55

De Madrid, España

Sir Cumference

@JaimeGallego ¿Como aprendias el ruso?

(no sé si mi gramática está bien. Estoy todavía aprendiéndolo)

Jaime Gallego

No he aprendido mucho de momento, la única anécdota era esa

0celouvsky

@Slereah yo

how would I make a box with an x inside

in tex

Anonymous

Anyone knows how to read/write Chinese language here?

dmckee

@0celouvsky \node[rectangle]{x}; in a tikz environment. But I doubt that is what you mean.

0celouvsky

18:09

Koolman

@blue you can ask DHMO

0celouvsky

@blue @DavidZ lived in china

Jaime Gallego

You can write \fbox{$\times$}

Anonymous

I'm curious as to how they manage to learn the 3000 or more characters in the Chinese language...it would be soooo difficult for a child to learn!

0celouvsky

smarter children

Anonymous

18:15

Most languages have less than 100 alphabets

Anonymous

@0celouvsky No wonder =P

Anonymous

Chinese characters

Chinese characters are logograms used in the writing of Chinese and some other Asian languages. In Standard Chinese, and sometimes also in English, they are called hànzì (simplified Chinese: 汉字; traditional Chinese: 漢字). They have been adapted to write a number of other languages including: Japanese, where they are known as kanji, Korean, where they are known as hanja, and Vietnamese in a system known as chữ Nôm. Collectively, they are known as CJK characters. In English, they are sometimes called Han characters. Chinese characters constitute the oldest continuously used system of writing in the...

Anonymous

My goodness, that's cool ^

Anonymous

Just one letter words for almost everything

Anonymous

18:17

I think they have some pattern which makes it easier to remember

DanielSank

I'm confused, are we speaking Russian or Spanish today?

Or Chinese?

Anonymous

@DanielSank It's a hodgepodge today =D

0celouvsky

@DanielSank Deutsch

DanielSank

@0celouvsky nein

Русский работает на телефоне!

HsMjstyMstdn

@dmc

oops

dmckee

18:26

Not for me, then?

0celouvsky

why are you spying?

HsMjstyMstdn

@dmckee, is there something inaccurate with Wrichik's answer in this question ?

1

Q: Why the work done on a charge is calculated from infinity?

Why the work done on a charge is calculated from infinity to a point, Why not from one particular point to other.

I seem to disagree with the second sentence of his second paragraph. He seems to suggest that the potential of a point is the potential difference between infinity and that point. While that happens to be true, it's inaccurate as a matter of definition, right ? One must first define potential before one can define potential difference.

Anonymous

"See, infinity is the place that is considered to have no charges, and is at 0 potential all the time." The first sentence can be a bit misleading.

dmckee

I don't think much of it is useful, but I'm not aware than any of the statements therein are demonstrably wrong.

HsMjstyMstdn

I agree that none of his statements are demonstrably wrong but isn't it untrue that we name the potential difference between infinity and a point as the potential of the point ? While it is equivalent, it isn't the definition of "potential", which is the work against the electric field you did to get that unit positive charge there.

Or am I being overly pedantic

dmckee

18:33

Aside: Careful with your words, here. The original question is about energy (we know because it is about work). Potential all by itself (i.e. not "potential energy" but just "potential") is a parameterization of the energy that would exist if a charge/mass was in a a certain place.

@HsMjstyMstdn Now back to the meat. When you say "the work to get the charge/mass there" you are already assuming that it came from somewhere. And when you find that the work only depends on the two places and not the path (so that a potential energy can be defined), there is already a notion of difference built in.

With the point charges formula it is very easy to not worry about the "where did it come from" but because you just wave your hands and say "way over there". But the notion is still lurking in the background.

I my answer I made that explicit by making the usual form the limit of a more general form where the "from where" is specified.

HsMjstyMstdn

Yeah, I should say electric potential. But somehow "Actually, we are measuring the potential difference between infinity and the required point." still rubs me wrong...

But I guess I'm harping on which definition comes from which here. I see your point.

Anonymous

4

A: Electric potential vs potential difference

What is the difference between "electric potential" and "potential difference"? What is the difference between age and age difference? If $\text{age}(person)$ is the function so that $\text{age}(you)$ is your age, $\text{age}(mom)$ is your moms age and $\text{age}(dad)$ is your dads age, then...

Anonymous

Saying potential difference is just fine imo.

0celouvsky

19:48

@BalarkaSen Are you around?

Secret

in Mathematics, 1 hour ago, by Meow Mix

You can measure how good they are by dividing the noodles per day by the proofs per day, and you'll get noodles per proof, an accurate measurement

in Mathematics, 48 mins ago, by Fargle

A comath student is a machine for turning cotheorems into coramen, but I don't know if the morphism is iso.

in Mathematics, 15 mins ago, by Secret

Cauchy Ramen Theorem Let an open pot of ramen. The ramen is soft enough and ready whenever it can be stirred and when stirred, it rotates without interruption in the pot

0celouvsky

@BalarkaSen Consider $\omega$ a closed 1-form on $R^2-\{0\}$ with $\int_{S^1}\omega=0$. Is $\omega$ exact?

Secret

in Mathematics, 14 mins ago, by Astyx

There is always ramen which sits at its original position in the ramen pot, no matter how it is stirred

0celouvsky

I'm thinking one should be able to deform that $S^1$ line integral to be around an arbitrary path

But the algebraic topology doesn't work out

Julian Rachman

Hello physics chat. I have a simple question if you don't mind answering it.

soinc.org/sites/default/files/uploaded_files/…

^ I do not know how to solve #18

If one of you could help me out that would be awesome :)

David Z

21:22

@blue If you're still interested: much the same way English speakers manage to learn to write thousands of words. Most Chinese speakers take until the end high school to learn that many characters. (BTW most Chinese words are two characters nowadays)

rob

@JulianRachman Do you know how to find that object's absolute magnitude using the HR diagram?

Julian Rachman

22:15

No. Could you walk me through it?

@rob

Qmechanic

22:31

-1

Q: How much energy is released from the splitting of a single hydrogen atom?

My question is a fairly simple one that I cant seem to find on Google: How much energy, in both technical and laymans' terms, is released from the splitting of a single hydrogen atom?

homework-and-exercises atomic-physics hydrogen

Unclear what's been asked? Starting with whether OP asks about atomic or nuclear physics.

0celouvsky

@Qmechanic It's so old, why bother?

Bernardo Meurer

22:48

@dmckee PLEASE BE HERE

I have to deliver something in 10 minutes

and I have some allocation bugs i cannot fix

PLEASE BE HERE

@Yashas maybe

dmckee

@BernardoMeurer I'm here. But ... 10 minutes isn't much time.

Bernardo Meurer

@dmckee OKAY ONE MOMENT

github.com/bemeurer/prog

The project01 folder

Lines 510-519

I think I'm being stupid when reallocating that pointer

How can I do this correctly?

github.com/bemeurer/prog/blob/master/project01/main.c

fuck

wait

I forgot to push

0celouvsky

@BernardoMeurer :/

dmckee

I;ve got to warn you that I am not familiar with the libraries you are using.

Bernardo Meurer

@dmckee There

@dmckee Those libraries are uninportant to the issue at hand. The fail is happening because of an integer array

Basically I want to reallocate board and board_history

From a function

dmckee

22:57

If (a) the original board was already pointing to some arrays of the sort you're doing in line 511 and (b) the reallocation made the board smaller, then you are not releasing some of the original allocation. Memory leak city.

Bernardo Meurer

@dmckee So I must free everything and do calloc instead of realloc?

Would that work?

dmckee

Similar comments apply to the board history.

@BernardoMeurer Well, you would need to free the ones that aren't going to exist after the size change. Again this only applies if things are getting smaller, and I can't tell that without more digging.

Bernardo Meurer

@dmckee Would freeing the whole thing and using calloc work?

I will try

dmckee

@BernardoMeurer It won't save any data, but at least you shouldn't leak.

Bernardo Meurer

I don't mind the data

WORKS

FUCK

1 minute late

FUCk

dmckee

23:02

That's why a lot of people prefer to work in managed languages.

Bernardo Meurer

Lol

dmckee

Though I think that working close to the metal, at least a little, should be part of every programmers education.

Bernardo Meurer

Well, now I lose 1.5 marks

w/e

Time to implement some more functionality

dmckee

There is an rather elitist only line that goes "I you can't drive a stick you can't drive.".

I'm of the opinion that people who can't deal with pointers are incomplete programmers.

But I work pretty hard on not dealing with pointers any more than necessary.

Bernardo Meurer

::looks at quadruple pointer in shame::

dmckee

23:04

Encapsulate. Encapsulate. Encapsulate!

Partition some of that junk off behind an opaque type.

Bernardo Meurer

Can't do that

prof prohibited typedefs and structs

for no reason anyone seems to understand

dmckee

Those kinds of restrictions can have there place. But usually in more limited assignments than this.

Bernardo Meurer

It's stupid to tell us to make a game without struct and typedefs

All it does is throw the student into having to perform dark magic

dmckee

Hmmm ... I have to say that I'm used to seeing "force them to confront [aspect of the language or programming structure]" by prohibiting the better way" rules in more focused assignments.

Bernardo Meurer

Meh, I don't like them

It's teaching us to do something in a context where something else is appropriate

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