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Archived threads in /sci/ - Science & Math - 189. page
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Is there a reality beneath spacetime?
>>
>>8278853
Is there a question in between bread?
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>>8278853
That image is just a model, we are not sitting on a sheet of "spacetime"
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>>8278920
>8278910 this

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Hey /sci/ I've been wondering about what particles are and all I find on the internet is what I learned in high-school. What are particles actually like? What is an electron, are they physical things?
>>
Each particle is unique. Electrons are very different from protons who are very different from neutrons.
>>
>>8278706
Irreducible representations of some lie algebra
>>
We know they are spherical, and each kind of particle has different parameters:
>mass/energy
>spin
>charge

>electrons
>protons
>neutrons
>photons
>neutrinos
>tachyon
for starters

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Monica Lewinsky has a sort of noticably roundish squarish jaw as opposed to a more normal pointed jaw.
I dated a girl who had a square jaw, and she ended up being cheating slut who had fucked up daddy issues.

Xena Princess Warrior is a sort of masculine female character who also has a square jaw.
Sigourney Weaver the protagonist of every movie in the Alien franchise also had a square jaw.

Is there some science I can look at on women with square jaws, and other information I can gather about people based on their jaw or other facial features?
>>
>>8278686
If you don't breed with women with square jaws your sons will be jawlets that will NEVER learn.
>>
>>8278686
What the fuck OP?
>Physiognomy
>>
>>8278692
So I googled Physiognomy and found a wikipedia article calling it a pseudo-science and a bunch of other sites associating it with stupid old-timey racists, but then are all these scientific studies posted on non-partisan sites and partisan sites of both ends that all purport some kind of connection between physical characteristics and personality traits all just part of an uber-racist mega conspiracy?

http://www.livescience.com/6169-guy-trustworthy.html
http://groups.anthropology.northwestern.edu/lhbr/kuzawa_web_files/pdfs/Kuzawa%20et%20al%20PNAS%202010.pdf
http://archive.is/Ryxl
http://nymag.com/news/features/33520/
http://www.ncbi.nlm.nih.gov/pubmed/10410197
http://www.salon.com/1999/11/04/size/

Ofcourse...

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>engineering pleb here
I am in love with my Physics 1 professor
>woman
>young
>somewhat good looking
>looks like she doesn't want to be there teaching us plebs Newtonian mechanics
>"i am a PhD. in physics"
>"yeah, yeah, we hate biology"
>boasts about how physics is the best field
I looked...
>>
I used to bother my physics 101 and 102 professors after class with all kinds of inane pleb physics based questions thinking they'd like me and that I'd be making a connection with them. Looking back at it I realize how cringey it all was and how much they probably hated me.
>>
>>8278662
the whole (a+b)(a-b) = b(a-b) destroys the concept because it messes with zeroes, which distorts the final answer.
>>
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>a scientist hating an other field of science
>any good

Is it belived that looking/falling into a Black hole you'd be able to see all of / end of the Universe ?

Sounds like some bullshit theory. I know that you should be able to see the universe as a sphere shape where the gravity is bent but not into the future or anything, that sounds like pure BS
>>
>>8278626
The idea is that because of relativity time for you passes extremely slowly relative to the rest of the universe.
>>
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>>8278626
>Is it belived [sic] that looking/falling into a Black hole you'd be able to see all of / end of the Universe ?
[citation needed]

Why don't you provide more details on your ideas in order to make this a worthy discussion
or come back to >>>/x/.
>>
Wow i would be all over that mom's toes

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What would be the best textbook for teaching myself calculus? Thank you
>>
Spivak or Stewart
>>
Manga Guide to Calculus
>>
Ignore people who say anything like Rudin, they have no idea what they're talking about.

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Would it be possible to get your teeth to such a cold temperature that they would shatter upon drinking a hot cup of coffee?
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>>8278546
yes
>>
No OP, the laws of physics don't allow it. /s

Fucking mong
>>
>>8278559
>>8278584
baka gaijin
/thread /s /t /u /v /... /$- \frac{1}{12}$

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Were they really bipeds, or just glorified chimpanzees and miocene apes?
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Fun fact : If we didn't decide to stand up and walk on two feet while evolving, and kept walking on our hands and legs, we wouldn't have most of our health problems today, including prostate, spine problems, increased risk of heart problems, etc...
>>
>>8278511
>implying evolution is decision-based rather than environment and mutation-based.
>>
>>8278511
I get the spinal and bone stuff, but what proof is there for prostate and heart problems?

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>For this thread we just despite the fact, that electronic charges would just rip this whole thing apart.

What would a kilogramm of electrons look like? Which color would it have, would it act similarish to a liquid, a solid or a gas? Would it be a "seethrought" material? Density? Have fun!
>>
>What would a kilogramm of electrons look like?
Like a lot of empty space since electrons don't like sticking together
>>
>>8278468
They would diffuse immidiately so you probably cannot see them
>>
That's a fuckload of electrons m8

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Hello /sci/, any of you bois into Îto Calculus?

I'm especially interested in the Heston model and stochastic integrals. If you've got any good resources on this, please post them here.
>>
I'm a bit curious as well about how /sci/ bros into calculus.

My masters thesis topic pivoted from being about plant ecology (lame/boring) to focusing on physics modelling (interesting/based) which I'm keeping my head above water on, even though I've never taken a physics class and I barely squeaked through Calc 2 (~7 years ago when I was a dumb nihilistic kid - I'd do much better now that I actually care about learning).

I could really use some kind of thoroughly distilled undergrad-level primer book to drill the basics of this stuff into my head.
>>
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>>8278414
Mathematica has some nice tools for SDEs. Here's what the equations on the "Heston model" Wikipedia page look like with parameters that I pulled out of my ass.
>>
>>8278414
I used to do a lot of studying of that stuff back when I went through a mathematical finance phase. Unfortunately I've lost all of my notes from that.

Ultimately though they're basically just integrals of random processes. It's seeing what you'd get assuming the process follows a certain distribution. A CDF is essentially the distribution of the Ito integral of the random process that is distributed according to the corresponding PDF.

Pag.16.

Let $\{E_{i}\}$ be a sequence of subsets (indexed set of subsets) of $X$ ($E_{i}\subset X$ for all $i \in \mathbb{N}=\{1,2,...\}$). We define $E^{*}$ as the set of points $x \in X$ which belong to $X$ for infinitely many values of $i$. Similarly we say that $x \in E_{*}$ if $x \in E_{i}$ except for a finite number of $i$s (i.e. we have $n \in \mathbb{N}$ such that $x \in E_{i}$ for all $i>n$). It follows that...
>>
>>8278063
Let $\{E_{i}\}$ such that (s.t.) $E_{1}\subset E_{2}\subset E_{3}\subset ...$. Then we prove that $\cup_{i=1}^{\infty}E_{i}=E^{*}=E_{*}$. We start from $\cup_{i=1}^{\infty}E_{i}=E^{*}$: if $x \in \cup_{i=1}^{\infty}E_{i}$ then $\exists i\in \mathbb{N}$ ($\cup_{i=1}^{\infty}E_{i}=\cup_{n \in \mathbb{N}}E_{i}$) s.t. $x \in E_{i}$. But $E_{i}\subset E_{i+n}$ for all $n \in \mathbb{N}$ hence $x \in E^{*}$....
>>
>>8278064
Let $\{E_{i}\}$ s.t. $E_{1}\supset E_{2}\supset E_{3}\supset ...$. Then we prove that $\cap_{i=1}^{\infty}E_{i}=E^{*}=E_{*}$. We start from $\cap_{i=1}^{\infty}E_{i}=E^{*}$: if $x \in \cap_{i=1}^{\infty}E_{i}$ then $x \in E_{i}$ for all $i \in \mathbb{N}$ hence $x \in E^{*}$. If $x \in E^{*}$ then $x \in E_{i}$ for inf. many $i$. Suppose there is an $i$ s.t. $x\not \in E_{i}$...
>>
If anyone of you guys is interested I can dumb down more of this book and upload the latex code on github or somewhere else.

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Can /sci/ recomend me an undergrad level book on differential equations avaiable in pdf with link please? Thanks.
>>
>>8277915
>what is libgen
>>
>>8277915
Nice tits.
>>
>>8277920
Sort of rude, but thanks.

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How can we marsform Terra?

It's only fair!
>>
>>8277770
We'll build a wall and make Terra pay for it.
>>
>>8277776
77777 get
>>
First we need to get rid of the magnetosphere.

Then we can lose the atmosphere to solar winds.

It will also be necessary to reduce mass, e.g. by sending SpaceX rockets out of the solar system.

Painting the surface red is also a good step in the right direction.

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Are physics majors welfare queens?
>>
>>8277731
No. Only statistics majors who make these silly charts. :-D
>>
>>8277925
No statistics major would ever use a pie chart
>>
Ok. These memes are retarded and old now. Not all physics major go on to do research in physics. Similarly, not everyone with a comp sci major goes on to grad school to work in machine learning or actual computer science.

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Can you do good science wwithout mathematical models?
>>
>>8277737
So Darwin was a bad scientist?
>>
>>8277737
So Tesla was a bad scientist?
>>
/sci/ will probably insist that you can't, but in fact you can. But it would limit the scope of questions that you can address.

What are the health risks of vaping, the same as smoking, or not as bad as smoking? WORSE than smoking? Does anyone even know??

Talking points:
Is inhaling hot vape smoke harmful to the lungs? What is it made of?
Is Nicotine itself harmeful to the body?
Are there any regulations that currently dont exist but need to exist for vaping?
>>
>>8277705
Isn't it just water and nicotine?
Or are there other dangerous chemicals lurking within the smoke of vape
>>
>>8277705

Vaping also has a tendency to increase ones arrogance and condescension which can result in getting them beaten up
>>
>>8277705
>What are the health risks of vaping, the same as smoking, or not as bad as smoking? WORSE than smoking? Does anyone even know??
There was some noise about the flavoring being a carcinogen, but nothing seemed to come of that.

>Talking points:
>Is inhaling hot vape smoke harmful to the lungs? What is it made of?
Nicotine and flavoring, as far as I know.

>Is Nicotine itself harmeful...

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How can I know if I'm smart enough to be a proficient and profitable programmer? I'm thinking of jumping into Java but I'm afraid of hitting a wall.
>>
>>8277672
How old are you OP ? You don't have to be good at maths to be a programmer. You just need to understand how code work and how to do thing.

If you just want to code, it's okay. Only PhD need to be extremly good at mathematics to create new algorithm / computer structure.

We have to stop this BS with maths = computer sience, only a smal amount of people need it. The rest can live without.

Sincerly, a computer scientist doing a MBI.
>>
>>8277678
Btw, to be a good programer, you just need to like what you're doing and pratice, again and again. I started by studying Computer Networking but I did learn HTML CSS and PHP by myself. It's not great-great, but I'm doing far better than most people that learn it in school because thay just learn it to learn it.

Love what you do, do it well.
>>
>>8277678
>You don't have to be good at maths to be a programmer

sure, if you wanna be a monkey

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HOW DO YOU SOLVE THIS

Fuck you /sci/ you cuks post this shit and don't post how to solve
>>
is 4
>>
50 + a + b = 180
10 + 40 + b + a = 180
???
profit
>>
>>8277661
>he can't solve a system of two equations with two unknowns.

I really hope you are underaged because if not you're basically a retard.

>>8277677
This guy has it.

A new semester is nearly upon us.

>>
pass all my exams and have a 4 month break.
>>
>>8277579
Learn how to solve ODE's, Neural nets and Image Processing.
>>
>>8277579
Get physically, psychologically and financially well enough to pass a few courses this winter.

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Then check this proof out!

useful in statistical mechanics and quantum chemistry
>>
>Hopetal
What's wrong with you? Is Hôpital.
>>
>>8277557
Stop trying to hurt my feelings. Joke's on you because it's not going to work!
>>
>>8277545

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Wtf I love linear algebra now
>>
>not submitting to linear-chan
>>
Yeah, the series is pretty great
>>
>>8277508
>3b1b is pretty great
ftfy

If every initial condition of the universe is known, could anything truly be random?
>>
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woah damn bro you are a really deep thinker
>>
>>8277221
no
>>
>>8277221
I was wondering something similar.

If we have a unified theory and a set of formulas for that.

Could we predict what was the state of a person that lived 200 years ago and copy that inside a computer?

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What practical use is chemistry besides making meth?

I'm taking it as a dual major just to make my resume look better.
>>
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make coffee
>>
Just about everything you touch was at least consulted by a chemist. They have their filthy hands on everything physical.
>>
>>8277158
I can guarantee you that at least 20 things in your room contain chemicals that come from that factory in Ludwigshafen.
Chemistry is massive money because chemicals are in literally everything.

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Lets say I put a tank over a fire, the tank is filled with air.

The fire is 1000 degrees.

Will the temperature in the tank ever exceed 1000 degrees?
>>
>>8277107
Depends on how well the tank radiates heat. If its a perfect insulator then there is no limit on how hot it can get inside
>>
>>8277129

For this experiment the tank is a perfect insulator.

So even though the heat of the flame will stay at 1000 degrees the heat in the tank can rise above that?
>>
>>8277169
Yes of course. The heat will never stop rising

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whats the formula for relating exponents?

if u=y^-3 and y=u^3, then what is u when y^-4?
>>
if u = y^-3 and y=u^3 then u*y^4=u^3
so u^2 = y^4.

so u^-2 = y^-4
>>
$y^{-4} = (y^{-3 }) ^ { \frac{4}{3} }= u^\frac{4}{3}$
>>
>>8277079
This doesn't make any sense, because quite obviously $u^2 = y^{-6} \neq y^4$

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Has /sci/ ever built a DIY spectrometer before?

I'm looking to do so using some of the basic build principles from the Open Lab Spectrometer project, but rather than using their webcam-based design, I'm looking to use a linear CCD array with an Arduino as a microcontroller so I can get some actual shit done with it. Arduino aside, I am aiming for a total build cost less than $100. I am mostly wondering if it's possible to get high-quality optical mirrors without going over-budget. I'm looking for a concave one for light focusing, and another... Comment too long. Click here to view the full text. 12 replies and 3 images submitted. Click here to view. >> >>8277043 >>8277043 > tarduino oh boy >> File: 1305LFW01f1.jpg (38 KB, 375x299) Image search: [iqdb] [SauceNao] [Google] 38 KB, 375x299 >>8277049 Should I use something else? I'm all ears on suggestions on the electronics; this will be my first project of this sort. >> >>8277043 >>high quality optics >> cheap Pick one What part of the spectrum? You can buy a handheld spectrometer for$250:
https://www.consumerphysics.com/

I think it is pretty shit though

Here's another one:
http://paxinstruments.com/opensource-spectrometer/
But it almost exclusively works in the visible range

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Alright /sci/, thought experiment time!

Imagine you have two space stations built about 400,000 miles apart in the emptiest region of their galaxy. Between them, despite the nearly impossible odds, they have managed to build a thin rod composed of some unfathomable material that is unbreakable and completely rigid. The rod is connected on either end to a lever and a contact point that will light up a small light bulb in the other station's module.

One day Space Station A shoots a laser towards the other station and in that same instant pulls the lever to activate...
>>
If the lever is infinitely rigid, it would turn on the lightbulb faster than the speed of light. Which is why objects can't actually be infinitely rigid and unbreakable.
>>
>>8276901
The atoms in the rod can only interact as fast as the speed of sound. So the force you applied pulling the lever has to travel across the entire rod at 340m/s (or whatever the speed of sound is) before the switch at the other end feels the force.
>>
>>8276933
>The atoms in the rod can only interact as fast as the speed of sound

what

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Just finished A-level maths and I'm looking to strengthen my maths. Any books or website recommendations for a mathematician with an A-level ability?
>>
>>8276712
http://4chan-science.wikia.com/wiki/Mathematics
http://4chan-science.wikia.com/wiki/Math_Textbook_Recommendations#High_School
>>
>A-levels
>hard
lol Americans...
>>
>>8276712
>A-level maths

The fuck does that even mean?

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Are any /sci/entists paranoid about being killed by a time traveler?
>>
>>8276667
>>8276667
I don't believe in that kind of time travel.

I only believe in the kind of time travel where you can only travel back to the point the time travel machine was activated.
>>
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why would anyone time travel into the past? this world sucks, a glorious bright future awaits
>>
>>8276672
I don't believe in car I only believe in trains. You can't drive without a rail!

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So I see a lot of different information about these people. Some places don't seem very reliable and there's tons of conflicting information.

Things like whether they
>used manganese dioxide to make fire
>had the ability to make complex sounds for communication

Does anyone know anything or have reliable sources for this kind of thing?

Sorry if this is more appropriate for /his/.
>>
They didn't have blond hair like that.
I fucking hate retarded artists doing reconstructions they have no idea about.
>>
She looks like shakira
>>
>>8276702
Source? Why couldn't they be blonde?

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