The h Bar

Bernard Meurer

02:00

@Obliv Badly but enthusiastically

@ChrisWhite We should play someday

It runs on Linux <3

ACuriousMind

@0celo7 Proudly.

0celo7

@ACuriousMind I dunno how you do it

I'd be embarrassed

ACuriousMind

What's there to be embarrassed about?

0celo7

oh boy

Bernard Meurer

Being a nerd is cool if you can spin it

0celo7

02:04

@ACuriousMind I'm sorry for you.

ACuriousMind

Why?

Obliv

@0celo7 I'm a firm believer that one can be both cool and a nerd.

0celo7

@ACuriousMind AH

Obliv

I think Feynman falls under this category.

Bernard Meurer

@ACuriousMind I'm mad at you btw; I had almost forgotten

0celo7

02:06

I HAD AN IDEA

ACuriousMind

@BernardMeurer ?

0celo7

maybe I have to pushforward the stuff

OH MY GOD

Bernard Meurer

@ACuriousMind You didn't love me back

ACuriousMind

@BernardMeurer You'll have to be more precise

Bernard Meurer

@ACuriousMind Pff, you know what I'm talking about

0celo7

02:07

@BernardMeurer ACM always knows why you're mad at him, don't let him tell you otherwise.

ACuriousMind

@BernardMeurer Oh. I don't add people on FB I haven't met in real life.

Bernard Meurer

@ACuriousMind Yeah just step on me now

break my petty soul

ACuriousMind

You want to found a cupcake satanist religion, your soul is pretty broken already I'd say

3075

lol

0celo7

@ACuriousMind Damn son

Bernard Meurer

02:09

AND YOU WERE MY PARTNER

ACuriousMind

@BernardMeurer Yes, my soul is fractured into a thousand glittering pieces :)

Bernard Meurer

This could be us Bjorn

0celo7

cool

oh @ACuriousMind

the "noob" comment

ignore it

@ACuriousMind you know the part in FC3 where you kill Vaas

wtf happened there

ACuriousMind

drugs, I think

0celo7

I feel like the devs were high when they made that section

ACuriousMind

02:13

Have you burned the ganja fields yet? :D

0celo7

yes

I appreciated the Skrillex

(the song that plays is Make it Bun Dem by Skrillex and some other dude)

did that song make it into the German version?

ACuriousMind

Dunno, I play almost all games in English

0celo7

@ACuriousMind yes but won't certain games have e.g. swastikas removed because you bought them with a German IP?

ACuriousMind

Oh, that, yes

0celo7

Skrillex & Damian "Jr. Gong" Marley - Make It Bun Dem [OFFICIAL VIDEO]

►

can you even play that?

ACuriousMind

02:17

nope, blocked :D

0celo7

@ACuriousMind lol at the CIA guy's comment: the flammenwerfer, from krautland

ACuriousMind

It werfs flammen.

0celo7

I'll flamm your werfs

I need to get some future house podcasts

@ACuriousMind can you listen to this?

3075

@0celo7 you didn't know what drum and bass was.

0celo7

@3075 huh?

dmckee

02:30

@Obliv The energy is transferred to other channels. Sound, light, heat, permanent deformation of either body. In general one has to work very hard at the macroscopic scale to insure that energy remains in kinetic channels, diversion to other modes is the default.

0celo7

@3075 the thing I linked is future house

a variant of deep house/big room

but like deep house/big room I only like a track here and there

not the genre as a whole

mb I'll give the big room playlist a try

w0w

dmckee

Concerning the typesetting of differentials, there is rather a lot said in

147

Q: What's the proper way to typeset a differential operator?

I can't seem to find any consensus on the right way to typeset a differential operator, whether it is: in a standalone context: as part of a derivative: as part of an integral: In all of these cases, I have seen them sometimes italicized like variables (as in the second and third examples ...

My answer points to the physics package which defaults to upright but can be set to do it the weird math way.

3075

@0celo7 listen to liquid dnb.

0celo7

@dmckee hmm, I use physics

Did I get that from you?

dmckee

@0celo7 No idea. I only started using it last semester.

0celo7

02:34

@3075 link me one good song

Obliv

@dmckee Thanks but I was talking to @ACuriousMind and came to the conclusion that in very point-like rigid bodies where deformation is hardly considered as well as friction, the loss in KE is a consequence of the mathematical quantity of KE.

0celo7

damn the big room electro playlist is banging

3075

@0celo7 fine.

@0celo7 youtube.com/watch?v=JBT5HNxj_To

0celo7

...how did you get the impression that I like chill music

Obliv

@dmckee $\sum KE_i \ne \sum KE_f$ when the masses are combined since $\frac{m_1{v_{1_i}}^2}{2} + \frac{m_2{v_{2_i}}^2}{2} \ne \frac{(m_1+m_2){v_f}}{2}$

3075

02:37

@0celo7 oh right.

Obliv

@dmckee whoops. meant to square the last velocity.

3075

we discussed this before.

0celo7

@Obliv F-

Obliv

@0celo7 D: why f-?

0celo7

@Obliv you missed a square

you got a worker killed

Obliv

02:38

so harsh..

0celo7

SOMEONE DIED

Obliv

NOT MY FAULT WE ALL MAKE MISTAKES

dmckee

@Obliv Sure, if you assume they bodies stick you can't conserve both kinetic energy and momentum and you must conserve momentum in an isolated system (generally assumed when talking about collisions).

0celo7

BUT WHEN YOU MAKE THEM PEOPLE DIE

dmckee

But for an isolated system you must also conserve energy, which means that have a diversion of kinetic energy into another channel is also mandatory.

0celo7

02:40

@3075 I like big room/deep house/future house because it makes me feel like I'm floating

rap is just fun

3075

@0celo7 and why do you want to be floating?

dmckee

Generally we ignore than in introductory treatments, but if you ask how/why the kinetic energy isn't conserved that is the answer.

0celo7

hardsyle is...well, dunno why I like it

and hardcore is generally shit, but awesome

Obliv

@dmckee Oh.. So that expression doesn't describe a physical system entirely? Is it the loss from the expression + whatever else is lost due to heat/deformation/etc?

3075

hardcore

0celo7

02:41

@3075 ...

Obliv

@0celo7 Maybe making mistakes in math matter more to a nuclear engineer, I'm just a selfish physicist :p

@0celo7 *physics student. Can't call myself that until I'm done with school.. ;(

dmckee

@Obliv Well, it's just sweeping the question of what happens to the energy under the rug. That's not really a problem as long as you know the question is lurking in the background.

0celo7

@Obliv Hah, I'm too dumb to work on anything that might get people killed

old school hardcore

dmckee

@0celo7 Hey. Life critical stuff is scary. Even have millions of dollars at stake is scary. But life-critical is very scary.

0celo7

@dmckee what?

I'm saying it's scary enough that I don't want to work on it

3075

02:43

@0celo7 first half sounds like the a.i. in starcraft o_o

dmckee

It's perfectly reasonable to shy away from stuff that people's lives depend on.

0celo7

@3075 I think it was an anthem

they all have a little talk in them

3075

lame.

dmckee

And if you are going to get into that business you want to do a long apprentiship under people who already know the business.

0celo7

@dmckee can you imagine me doing anything other than R&D

that's typically not life critical

middle school hardcore

dmckee

02:45

You presume I can imagine you doing R&D. ;D

MOre seriously, R&D does occasionally involve decisions that people's lives rest on. But more often it's just a lot of money at stake.

0celo7

@dmckee what

dmckee

I was present when we came close to a mistake that could--in principle--have destroyed a US$30million detector system.

3075

@0celo7 have any daycare hardcore?

0celo7

@3075 yes.

Ni5mo - 1 HOUR HAPPY HARDCORE MIX!!

►

Note: I do not listen to happy hardcore.

Obliv

@dmckee I'm still confused as to where that lost energy goes. Like if $(a-b)^2 < a^2 - b^2$ where does the $-2ab$ go? Does it have to go anywhere? If E is conserved then surely it is transformed into something. I'll have to explore the mathematical proof more tomorrow. Going to go to sleep night guys o/

0celo7

02:49

@dmckee I was present when we almost ruined a \$50,000 furnace. Does that count?

@Slereah Yup, Visser is stuck in a USPS wormhole.

According to Amazon it's expected by 8PM on the 29th of March.

dmckee

@Obliv It goes into non-kinetic channels. That's the whole point. The thing that is conserved is energy, not kinetic energy. Different types of energy can take up the slack.

user116211

I'm reading French's Newtonian Mechanics..... I got a line:

dmckee

@0celo7 Not bad for your first year on the job.

0celo7

@dmckee Get a copy of Arnold yet?

dmckee

If you stick with it you'll have bigger scares.

0celo7

02:52

@dmckee I was the one who pushed the final button!

Really, it was the grad student's fault

He's the one who wanted the synthesis to take place at 1800C!

Not my fault the furnace crapped out and blew the fuse

dmckee

@0celo7 Nawh. I was going to look at a copy up at [nearby major university] while I was on break, but I got to talking with [older faculty member] there and ran out of time to go by the university.

0celo7

@dmckee Does your school not have a MyCopy subscription?

I love my $25 paperbacks

dmckee

@0celo7 This. Even though we act casually most of the time there is a hierarchy and the guy in charge has to take the fall.

user116211

> For Newton, this was a dynamical result, expressing the basic properties of the force law.

dmckee

@0celo7 Don't know. Haven't heard of it.

0celo7

02:54

@dmckee I'm assuming you're not on campus right now?

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

@MAFIA36790 do you have a paperback edition?

user116211

> But for Einstein, the fact that all objects fall toward the Earth with the same acceleration $g$, whatever their size or state, implied that this must be in some truely profound way

dmckee

@0celo7 Not now. Night class ended more than an hour ago.

user116211

> a kniematic or geometric result, not a dynamic one.

user116211

Now, can anyone tell me, how gravitation is not a dynamic phenomenon?

user116211

02:56

I'm not getting that.

0celo7

I love how SW present the equivalence principle

user116211

@Sᴋᴜʟʟᴘᴇᴛʀᴏʟ Yes.

0celo7

they say that since the acceleration does not depend on mass, the trajectories of particles are like those of geodesics

so Einstein concluded spacetime is a manifold

years and years of labor in two sentences

user116211

@0celo7 So, is it what French called geometric?

0celo7

@MAFIA36790 Yes.

GR is simply the geometry of a Lorentzian manifold

user116211

02:59

So, gravitation is not force as said by Newton?

0celo7

So while I spend many of my days doing "GR" I'm really just doing Lorentzian geometry (shout out to all my homies, STAR BOARD LET'S GOOOOO)

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