The h Bar

i had this dream last night where a cat had broken into my apartment and was living inside a cupboard without me realizing it and kept shitting everywhere when i wasn't home.

i think i got rid of it though

ACuriousMind

@JohnRennie the compiler already exists, fortunately, I'm just stealing its work ;)

skullpatrol

@JohnRennie give it a shot?

John Rennie

@skullpatrol the world does need another compiler. There are too many of them already :-)

loocsieulb

@BalarkaSen

Balarka Sen

Beautiful

skullpatrol

4:58 PM

classic

John Rennie

@ACuriousMind the thingabout a complex IT project is you have to try and assemble a mental map of all the bits to understand how it ll fits together. It can be remarkably hard for a big complicated project. Working on a really big project like Kodi I've found it took me days and days to attain that nirvana momet.

At the moment I'm trying to rewrite the mathematical model for doing calculation of equilibria in reactor cooling systems and nirvana is some way off yet!

Secret

5:13 PM

in Mathematics, 1 min ago, by Abhas Kumar Sinha

I'm trying to understand space-time

in Mathematics, 1 min ago, by Abhas Kumar Sinha

and timetravel

Balarka Sen

rip in cringe

Eric Silva

@BalarkaSen is this what physics is

Balarka Sen

Yes

Anonymous

I'd advice him to contact Deepak Chopra

Balarka Sen

LOOL

skullpatrol

5:17 PM

Deepak the quack?

Anonymous

He'd be a great heir to that throne for sure ;)

Anonymous

@skullpatrol I didn't know Deepak quacks

skullpatrol

If it walks like a duck and talks like a duck...

bolbteppa

All the 'convenient choice' coefficients in string theory are so frustrating

O.Rares

does anyone knows how to get the dissipated energy on a rezistor if the intensity is 4 ?

the answer is sqrt(2)*64/5 but I couldn't figure out what is the formula

John Rennie

5:25 PM

What is the intensity? That is, what quantity do you mean by intensity?

Light intensity? As in a light dependent resistor?

O.Rares

the current intensity

John Rennie

4 amps?

O.Rares

yes

John Rennie

Power dissipated is just $W = I^2R$

Where I is the current through the resistor and R is the resistance

Anonymous

@BalarkaSen Do you know about the max stable distribution stuff....Gumbel, Weibull, Frechet etc? I had some question about convolution of distributions to form max stable distributions

O.Rares

5:28 PM

it says the dissipated power after 2 seconds and on graph at 2 second is 4 amps

Balarka Sen

@Blue I'm afraid not. @Eric is the functional analyst

Anonymous

It's not functional analysis. Just statistics :P

Anonymous

Maybe they overlap

O.Rares

@JohnRennie so strange then.Thanks for help

loocsieulb

@Blue that's not funny

John Rennie

5:30 PM

@O.Rares you'll need to give us a bit more information. For example you are referring to a graph and I have no idea what the graph shows.

loocsieulb

deepak specializes in quantum healing

he needs to contact JD i think

Balarka Sen

@Blue Oh I see, no idea

O.Rares

@JohnRennie is just a linear graph with time and intensity and the problems says that if we apply the graph to a resistor what will be the dissipated power after 2 seconds

and at 0 seconds there are 0 amps and at 2 second there are 4 amps

John Rennie

@O.Rares I wonder if it means the total energy dissipated in the first two seconds. You'd get that by integrating the power with respect to time.

Anonymous

@BalarkaSen I was reading some pretty cool stuff about probability distributions today. Mainly the Levi $\alpha$ stable distributions and the generalized Central Limit theorem for infinitely divisible distributions.

Anonymous

5:36 PM

The convolution of probability distributions is apparently very helpful in predicting rare events like earthquakes and avalanches (basically if you linearly rescale random variables with identical probability distributions they tend to the max stable distributions...and there are only three types of them in classical mechanics). We could talk about that someday, I was quite surprised on learning the huge applications of this area of statistics :) Meanwhile lemme ask my question on MSE :P

Anonymous

The guassian is apparently an extreme case of the levi alpha stable distributions where the odd cumulants vanish....and there's tons of applications of that too

O.Rares

@JohnRennie Yes,the total energy dissipated. Is it possible to get the power only from the intensity ? If not I think the problem is missing some details

John Rennie

Well the power is $I^2R$. From what you say the current is given by $I = 2t$ where $t$ is the time in seconds e.g. at $t = 2$ seconds the current is 4 amps.

That means the power is $W(t) = 4Rt^2$

Integrate that to get the total energy dissipated as a function of time and we get:

$E(t) = 4/3 R t^3$

O.Rares

Thanks a lot,hope that it will help me tomorrow

Slereah

almost had a grease fire

Well, i had a grease fire

Fortunately it extinguished

Another day alive

John Rennie

5:49 PM

You burned John Travolta?

bolbteppa

Yikes, get that special blanket for those things

Eric Silva

@BalarkaSen i would never call myself one but ok

Anonymous

Hi @EricSilva, haven't seen you here before

Eric Silva

hello, yeah i came here on a whim

Anonymous

Well, welcome to the physicist's bar :P

Eric Silva

5:59 PM

lol thanks

ACuriousMind

@Blue Should be the physicists' bar, unless you mean to imply there's only one physicist left here ;)

Anonymous

@ACuriousMind Actually that's true. There's only one physicist left here....and that's JR :D

Anonymous

And whether he is a physicist is debatable (he's a good-at-everything physical chemist)

Anonymous

:P

John Rennie

I'm retired. These days I'm a layabout not a physicist :-)

0celo7

6:09 PM

@BalarkaSen if Eric is a Functional Analysis what am I

Fucking autocorrect

Mithrandir24601

@Blue I'm a physics PhD student... Does that count? (I think we've talked about this before...)

Anonymous

@Mithrandir24601 shoo shoo...you engineer

Anonymous

:P

Mithrandir24601

@Blue :P

Balarka Sen

@0celo7 you're a PDE

there is only one physicist and his name is John Duffield

John Rennie

6:15 PM

The phantom unstarrer strikes again

Anonymous

That was unstarred by a mod

John Rennie

Let us not discuss those who have departed the mortal (chat) realm

albeit temporarily.

Balarka Sen

yes, let us take a moment of silence

both for his departure and for his potential arrival

Anonymous

lol

Slereah

Can we be mean again when he comes back

John Rennie

6:18 PM

As a room owner I couldn't possibly condone that

0celo7

@BalarkaSen the heir of Einstein

@JohnRennie I put a lot of spinach in stroganoff last night

It’s a magic leaf

John Rennie

That seems an odd thing to do

0celo7

Makes everything better

Slereah

no, the coca leaf is magical

Spinach is pretty ordinary

Balarka Sen

@0celo7 bestowed with the kingly title "the Evidence"

John Rennie

6:21 PM

I would have thought spinach in a stew would rapidly turn into a green sludge

Balarka Sen

Show me the evidence - Richard Dawkins repeat

►

0celo7

@JohnRennie I didn’t cook it in there for 10 minutes!

Put it in for a minute and then served

Along with broccoli and carrots

You’d be allergic to my food

Slereah

6:49 PM

what is the maximal structure group for a bundle anyway

Is it $\operatorname{Diff}(E)$ or $GL$

Or is it basically the same thing

i dunno

CooperCape

ola

Slereah

tips hat

CooperCape

winter bash ended a while ago.

::feels sense of deja vu::

0celo7

7:10 PM

@Slereah GL

Slereah

Are all fiber bundles with the same total space, base space, fiber and structure group isomorphic?

I guess I should specify the smallest structure group possible

Otherwise you could do both the tangent bundle and trivial bundle with GL

loocsieulb

@CooperCape wait why

DanielSank

Hey, @ACuriousMind, is it true that Germans think that eating reheated spinach spells instant death?

CooperCape

7:25 PM

@loocsieulb chat.stackexchange.com/transcript/71?m=42214758#42214758

ACuriousMind

@DanielSank I have never heard of that

loocsieulb

7:53 PM

@CooperCape same

Cows

Heading to the gym. Today is leg day :(

docscience

8:09 PM

Cows, so whos legs you watching?

loocsieulb

wot

docscience

... at the gym

oops the cows went home, well to the gym

Physics Meta

0

Q: Should existing vote tally ever be considered when voting?

It seems obvious--the choice to upvote or downvote a question or answer should be based solely on the content. But it's sometimes difficult to ignore what appear to be unfair tallies. I sometimes have an urge to "cancel" what appears to be a mean downvote on a question or an answer that has no ...

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