Mathematics - 2012-10-10 (page 4 of 4)

@JasperLoy actually, 876 that are not deleted. When I mentioned breaking 900, I forgot that the total I see includes deleted posts unless I filter them out.

user19161

@Charlie Wow wow, so many copies of the f word today. =)

John Smith

10:17 PM

I did get a hint response though @oldJohn if you care to see

Charlie

@JasperLoy yeah!when i'mmad i say it!only in english..i rarely say it in portuguese...

John Smith

@JasperLoy Yes, I got a response but accidentally deleted my own question

robjohn

@JasperLoy Do I need to bring out the soap?

John Smith

not sure if it'll let me repost

user19161

@robjohn Ah, I deleted all of mine with score of 0. Hehe. Now and then, I will divide my rep by the number of posts to see the average score. My MSE ratio is quite low.

Old John

10:18 PM

@JohnSmith was it from Robert Israel?

John Smith

It was

user19161

@JohnSmith How did you delete your question if you got an answer?

robjohn

@JasperLoy and some of the rep comes from other sources... bounties, etc

John Smith

@JasperLoy I have no idea

Old John

@JohnSmith I read it a while back - he suggested looking at a different form of the equation, I think

user19161

10:18 PM

@JohnSmith Hmm, maybe you clicked delete and the answer was posted within seconds of it.

John Smith

I did get his equation written down but I don't know how it was deleted

he suggested I use the equation $(z+(b-c)/2)^2 + (a+(b+c)/2)^2 = (b-c)^2/2$

Old John

Yep - that was it

Charlie

@JasperLoy Good Morning Jasper!

John Smith

I have no idea why this form helps though

Old John

I wasn't sure that it helped very much, though

John Smith

10:20 PM

figured some sort of sum-of-squares identity but wasn't able to find any insight

Old John

@JohnSmith me neither

user19161

@Charlie Good evening M!

Charlie

@JasperLoy This what i think every time you say that!

John Smith

it almost looks like an ellipse equation

user19161

@Charlie I am J and you are M, yay!

Charlie

10:24 PM

@JasperLoy AAAAHHHHH!!!!awesome!

@JasperLoy (@Jayesh is JB...) James Bond...

Old John

@JohnSmith It could be a circle in the $x$-$a$ plane - but I don't see how that helps either

counting integer points on circles is still problematic

user19161

@Charlie Justin Bieber.

Jonas Teuwen

@PeterTamaroff Peter.

Charlie

@JasperLoy aw... James Bond is better

user19161

@Charlie No, Justin is better.

Argon

10:26 PM

Back

Charlie

@JasperLoy NO

Argon

We will skip that annoying combustion thing

Charlie

@Argon so Aaron i'm studying here

user19161

@Charlie Analysis again?

Argon

@Charlie ???

Charlie

10:28 PM

@Argon you chemistry thing

i'm envolved

Argon

@Charlie Oh :)

We will for now disregard combustion

user19161

@Charlie envolve?

Charlie

@Argon the iron thing is combustion

@JasperLoy i like it

that's because it is an oxidation too D'oh

user19161

@Charlie Interestingly, although Bond changes, M is usually the same actress.

Argon

@JasperLoy M used to be a guy...

Charlie

10:30 PM

@JasperLoy O.o man... inever stoped to think about it...

serious

Argon

user19161

@Argon Haha, you watch such old movies!

Charlie

@Argon so the magnesium is also a combustion

Argon

@Charlie QED

user19161

Nowadays young people like to watch old movies and old people like to watch new movies.

Charlie

10:31 PM

@Argon have you ever seen this reaction?it's really beautiful!i almost got blind :P

Old John

@JasperLoy narh - I am (fairly) old - and I like old movies

Argon

@Charlie Nope :).

user19161

@Charlie Blinded by love for ...

Charlie

@JasperLoy what?

user19161

@Charlie Intentionally left blank.

Charlie

10:32 PM

@Argon i had laboratory lectures.really nice

Argon

@Charlie We stopped making most of the somewhat dangerous reactions at school as one year, we had an explosion and had to evacuate the school...

Hahahaaaa

user19161

We had to wear goggles. They look so silly.

Charlie

@Argon that's cool!one guy DIED in mine:P

user19161

@Charlie Really?

Charlie

@JasperLoy oh..i like thenm

@JasperLoy really.

user19161

10:33 PM

@Charlie Then you should not smile.

Charlie

tv was there...a commotion

Argon

@Charlie Geez

Charlie

@JasperLoy laugh instead of crying

Old John

In my first year of teaching, a girl came out of the first exam I ever set, had a brain haemorage and died :(

Charlie

@OldJohn O.o

user19161

10:34 PM

@Charlie What? OK, I have a sense of humour so I can get it.

Argon

Scary

user19161

@OldJohn How did it happen?

Old John

@Charlie I felt really bad, but everyone said it ws nothing to do with my exam

@JasperLoy all I knew was that she walked out of the exam, collapsed, and died

Charlie

@Argon i had a teacher a chem teacher who worked somewher else.Then he , to prank put SOLID SODIUM in the children's pool!

user19161

My classmate and cousin both suicided.

Charlie

10:36 PM

@OldJohn oh..that would be ... killed by a meth exam...

@JasperLoy darn :((

@JasperLoy oh my..

@Charlie :)

solid sodium..is Really cool!

user19161

Also, I observe informally that people whose names start with J tend to become nuts more than others.

Argon

10:37 PM

@Charlie I've seen it react in water

Old John

@Charlie I thought it was the opposite when in water :)

@JasperLoy seems logical :)

user19161

@OldJohn Hehe, we are both J.

Charlie

@OldJohn $Na_(s) + H_2O\Rightarrow FUN!$

Old John

and we are both ...

Charlie

@JasperLoy J is my fav letter in english.

Old John

10:38 PM

@Charlie define "fun" :)

Charlie

in portuguese is L

@OldJohn KABOOM

user19161

@Charlie M is my favourite girl on SE...

Charlie

@JasperLoy What do you mean?

@Argon any other issue?

user19161

@Charlie Meaning, among all the female SE users, I like M best.

Argon

@Charlie Soon :)

Fission/Fusion problems

Charlie

10:40 PM

@JasperLoy hmm

I'm M...

user19161

@Charlie Exactly, I was referring to you...

Charlie

@JasperLoy Cute!

@Argon oh

Argon

@Charlie An $\alpha$-particle is equivalent to a $He$ in terms of protons-neutrons, right?

Charlie

@Argon I think so

yup it is

Argon

@Charlie So would I write: $A \to B+_2 {}^4 He$ or $A \to B+\alpha$?

user19161

10:43 PM

You remember all your chemistry @charlie?

Charlie

@Argon yes.

@JasperLoy I like to remember

Argon

@Charlie Which? No. 2?

Charlie

@Argon 1

user19161

I remember there were alpha, beta and gamma.

Charlie

but i think both are right.but more commonly the first i guess

Argon

10:45 PM

@JasperLoy Indeed. $\alpha$ is $He$, $\beta$ is like $e$ and $\gamma$ is just energy

From what I gather

user19161

I think you call it alpha or helium depending on how it is produced.

user19161

So the distinction matters.

Argon

@JasperLoy When is one preferred over another?

user19161

@Argon Well, alpha is emitted under certain conditions, no? Anyway, I have forgotten all this stuff, so don't take me too seriously.

Charlie

@JasperLoy what? example please,sir

Argon

10:47 PM

Chemistry is annoying.

user19161

@Charlie You use alpha when there is radioactive decay, helium otherwise.

Charlie

@Argon it's cool

Argon

$\gamma(\alpha,\beta)$

Lower incomplete gamma function is cooler then incomplete combustion

user19161

So if there is no decay, you can't just call it alpha particle.

Charlie

@JasperLoy are...you...sure...?

Argon

10:48 PM

@JasperLoy Would it be considered to be decomposition?

user19161

@Charlie Well, I think that is common sense, but maybe I am wrong.

user19161

@Argon Hmm, not sure what that means. Anyway, just listen to your teacher.

Argon

@JasperLoy Its a type of reaction.

Let's see... Neutralization reactions react w/ acids and make salts and water...

Charlie

@Argon of course

$NaOh + HCl \Rightarrow NaCl + H_2O$

user19161

I remember my high school exams were mostly 3 hours long. Quite ridiculous, really.

Charlie

10:52 PM

@JasperLoy in my school exams were like one hour

sometimes one hour and forty min

user19161

@Charlie Hmm, Brazil sounds nice. Maybe I will live there one day...

user19161

@Charlie forty

Argon

@Charlie My exams are somewhere between 1 and 3 hours. Depends on the subject

Charlie

@JasperLoy i was right in first place?

user19161

@Charlie forty not fourty, but fourteen not forteen

Charlie

10:54 PM

@Argon in my uni the thing is creepy..you know..some prof give infinity time

user19161

@Charlie infinity

Argon

@Charlie Really? I'm jealous.

Old John

g'night all!

Argon

That's great

user19161

@OldJohn Night!

Argon

10:55 PM

@OldJohn Good night!

Charlie

@Argon once i had a test .started 10h00.I went to 13h30min because i had another test at 14h00

user19161

I think exams should be done in a day. If I have four subjects, I want to take four papers in one day and get it over.

Charlie

yeah

Argon

@JasperLoy That would be a hell of a day!

Charlie

that day i almost starved to death

user19161

10:56 PM

@Argon After hell comes heaven! Endure!

Peter Tamaroff

@JasperLoy You're a masochist.

@JasperLoy Wrong... Hell is eternal!

@JasperLoy Maybe Purgatory?

user19161

@PeterTamaroff Now doesn't that have a sexual innuendo Pedro?

Peter Tamaroff

@JasperLoy Nope.

user19161

@PeterTamaroff Why is your English so good? You can even use "innuendo".

Peter Tamaroff

@JasperLoy The British taught me!

user19161

10:59 PM

@PeterTamaroff I know they like to unbutton one more than the Americans. The guys are more low cut!

user19161

Hehe, this is so interesting. Pedro calls Jonas and Jonas calls Pedro but they end up saying nothing.

Charlie

Let's stop with the sexual harassment here...

user19161

You know what is common between Pedro and Jonas? Each word has five letters.

Argon

What, exactly, is a Hydrogen bond?

Charlie

@Argon oh i know..

it can only be with N,O and F

user19161

11:04 PM

@PeterTamaroff Not the Buddhist hell which is not eternal, though it lasts very long.

Argon

@Charlie Right. Its a dipole-dipole bond, eh?

Peter Tamaroff

@Argon I call that Hydrogen Bridge

@Argon Well, it is a very strong bond.

Stronger than dip-dip

user19161

@PeterTamaroff HB also stands for Holy Buddha!

Argon

@PeterTamaroff Its it a form of dip-dip bond?

Peter Tamaroff

@Argon Yes.

John Smith

11:05 PM

I am going insane lmfao

user19161

@JohnSmith I doubt it.

Argon

@PeterTamaroff Why does it occur?

Peter Tamaroff

But Since $N$ $O$ and $F$ are very electronegative and have small radii, the bond is strong with that one.,

Argon

@PeterTamaroff I see

Charlie

@Argon no..

Peter Tamaroff

11:06 PM

For example, $B$ has the same ENeg as $N$ but it has too big of a radius.

Charlie

dipole is weak

Argon

@Charlie ??? Pedro told me otherwise

user19161

Wow, Pedro remembers all his chemistry!

Charlie

what the hell fuck is going on here?

Argon

@PeterTamaroff Why does the radius change the strength of the bond?

Charlie

11:07 PM

dipole is not hydrogen boud

sec.Dinner

Peter Tamaroff

@Argon The electron clouds wear off the pull of the nucleus

Argon

@Charlie Bye

user19161

@PeterTamaroff nucleus?

Peter Tamaroff

@JasperLoy Sorry!

Argon

@PeterTamaroff Ok, so it is a stong dipole-dipole

user19161

11:08 PM

Proton, electron, neutron. Yesterday, today, tomorrow. 3 is such an interesting number.

Argon

If no net ionic equation exists, does that mean no reaction occurred?

To do multiple alpha/beta decays, do I just take the result of the previous decay and do it again?

Ian Mateus

@Argon No, yes (I think)

Argon

@IanMateus ?

Ian Mateus

@Argon first problem, second problem

Argon

@IanMateus Ok, thanks

If $Po-210$ has an alpha decay twice, followed by a beta decay and an alpha, would we have an $Au-198$?

Ian Mateus

11:33 PM

@Argon Check the charges

Argon

@IanMateus Here's what I did:

$^{210} _{84} Po \to ^4_2 He + ^{206}_{82} Pb$

for the first decay

$^{206}_{82} P \to ^4_2 He + ^{202}_{80}Hg$

$ ^{202}_{80}Hg \to ^0_{-1} e + ^{202}_{81}Ti$

$^{202}_{81}T \to ^4_{2} He + ^{198}_{79}Au$

Ian Mateus

@Argon I think it is ok, I would have done that

Argon

@IanMateus :) Great, thanks

Ian Mateus

Why do you use helium instead of $\alpha$?

Argon

@IanMateus Apparently, they are somewhat interchangeable.

I also used $^0 _{-1}e$ instead of $\beta$

Ian Mateus

11:39 PM

@Argon I noted that. It might be didatic thing, I've seen these things somewhere

Argon

@IanMateus I would think you are correct.

Thanks again.

Ian Mateus

@Argon I know nothing about chemistry, however.

Ok

Argon

@IanMateus Enough for me!

Ian Mateus

@Argon have you seen the differential equation thing related to radioactive decay?

Jayesh Badwaik

@Argon I would prefer you say the complete element name $^4_{2} He$ instead of $\alpha$. $\alpha$ is a relic from the days when the nuclear structure was unknown and we still had to describe rays emitted from various radioactive sources. You can interchange them, but its not really worth it.

@Charlie Try to burn a magnesium ribbon and you would know why it is combustion! Magnesium is sometimes used in firecrackers for the same purpose. :-) @Argon Most of the combustion is (really quick self-supported) oxidation.

@JonasTeuwen You wrote it? Or got it from somewhere? Anyway, nice.

user19161

11:55 PM

@JayeshBadwaik You could not sleep?

Jayesh Badwaik

@JasperLoy Slept for like 3 and a half hours.