Archived threads in /sci/ - Science & Math - 189. page

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Is there a reality beneath spacetime?

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>>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

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?

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Each particle is unique. Electrons are very different from protons who are very different from neutrons.

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>>8278706

Irreducible representations of some lie algebra

>>

We know they are spherical, and each kind of particle has different parameters:

>mass/energy

>spin

>charge

You want to read about:

>electrons

>protons

>neutrons

>photons

>neutrinos

>tachyon

for starters

Anonymous

Female Jaw Science 2016-08-17 23:23:55 Post No.8278686

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Female Jaw Science 2016-08-17 23:23:55 Post No.8278686

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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?

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>>8278686

If you don't breed with women with square jaws your sons will be jawlets that will NEVER learn.

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>>8278686

What the fuck OP?

>Physiognomy

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>>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...

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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.

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>>8278662

the whole (a+b)(a-b) = b(a-b) destroys the concept because it messes with zeroes, which distorts the final answer.

>>

>a scientist hating an other field of science

>any good

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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

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>>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/.

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Wow i would be all over that mom's toes

What would be the best textbook for teaching myself calculus? Thank you

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Spivak or Stewart

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Manga Guide to Calculus

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Ignore people who say anything like Rudin, they have no idea what they're talking about.

Anonymous

Question for /sci/ 2016-08-17 21:49:53 Post No.8278546

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Question for /sci/ 2016-08-17 21:49:53 Post No.8278546

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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

/thread

>>

No OP, the laws of physics don't allow it. /s

Fucking mong

Anonymous

Australopithecines 2016-08-17 21:20:00 Post No.8278499

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Australopithecines 2016-08-17 21:20:00 Post No.8278499

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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...

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>>8278511

>implying evolution is decision-based rather than environment and mutation-based.

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>>8278511

I get the spinal and bone stuff, but what proof is there for prostate and heart problems?

Anonymous

Kinda like Chemistry... 2016-08-17 20:58:56 Post No.8278468

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Kinda like Chemistry... 2016-08-17 20:58:56 Post No.8278468

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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!

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>What would a kilogramm of electrons look like?

Like a lot of empty space since electrons don't like sticking together

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>>8278468

They would diffuse immidiately so you probably cannot see them

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That's a fuckload of electrons m8

Anonymous

ÃŽto Calculus? 2016-08-17 20:21:33 Post No.8278414

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ÃŽto Calculus? 2016-08-17 20:21:33 Post No.8278414

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Hello /sci/, any of you bois into ÃŽto 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.

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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.

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>>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.

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Let [math]\{E_{i}\}[/math] be a sequence of subsets (indexed set of subsets) of [math]X[/math] ([math]E_{i}\subset X[/math] for all [math]i \in \mathbb{N}=\{1,2,...\}[/math]). We define [math]E^{*}[/math] as the set of points [math]x \in X[/math] which belong to [math]X[/math] for infinitely many values of [math]i[/math]. Similarly we say that [math]x \in E_{*}[/math] if [math]x \in E_{i}[/math] except for a finite number of [math]i[/math]s (i.e. we have [math]n \in \mathbb{N}[/math] such that [math]x \in E_{i}[/math] for all [math]i>n[/math]). It follows that...

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>>8278063

Let [math]\{E_{i}\}[/math] such that (s.t.) [math]E_{1}\subset E_{2}\subset E_{3}\subset ...[/math]. Then we prove that [math]\cup_{i=1}^{\infty}E_{i}=E^{*}=E_{*}[/math]. We start from [math]\cup_{i=1}^{\infty}E_{i}=E^{*}[/math]: if [math]x \in \cup_{i=1}^{\infty}E_{i}[/math] then [math]\exists i\in \mathbb{N}[/math] ([math]\cup_{i=1}^{\infty}E_{i}=\cup_{n \in \mathbb{N}}E_{i}[/math]) s.t. [math]x \in E_{i}[/math]. But [math]E_{i}\subset E_{i+n}[/math] for all [math]n \in \mathbb{N}[/math] hence [math]x \in E^{*}[/math]....

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>>8278064

Let [math]\{E_{i}\}[/math] s.t. [math]E_{1}\supset E_{2}\supset E_{3}\supset ...[/math]. Then we prove that [math]\cap_{i=1}^{\infty}E_{i}=E^{*}=E_{*}[/math]. We start from [math]\cap_{i=1}^{\infty}E_{i}=E^{*}[/math]: if [math]x \in \cap_{i=1}^{\infty}E_{i}[/math] then [math]x \in E_{i}[/math] for all [math]i \in \mathbb{N}[/math] hence [math]x \in E^{*}[/math]. If [math]x \in E^{*}[/math] then [math]x \in E_{i}[/math] for inf. many [math]i[/math]. Suppose there is an [math]i[/math] s.t. [math]x\not \in E_{i}[/math]...

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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.

Can /sci/ recomend me an undergrad level book on differential equations avaiable in pdf with link please? Thanks.

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>>8277915

>avaiable in pdf with link please

>what is libgen

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>>8277915

Nice tits.

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>>8277920

Sort of rude, but thanks.

How can we marsform Terra?

It's only fair!

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>>8277770

We'll build a wall and make Terra pay for it.

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>>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.

Are physics majors welfare queens?

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>>8277731

No. Only statistics majors who make these silly charts. :-D

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>>8277925

No statistics major would ever use a pie chart

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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.

Can you do good science wwithout mathematical models?

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>>8277737

So Darwin was a bad scientist?

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>>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.

Anonymous

Are Vapes Safer than Cigarettes? 2016-08-17 14:05:31 Post No.8277705

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Are Vapes Safer than Cigarettes? 2016-08-17 14:05:31 Post No.8277705

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Are Vapes Safer than Cigarettes?
Anonymous
2016-08-17 14:05:31
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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?

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>>8277705

Isn't it just water and nicotine?

Or are there other dangerous chemicals lurking within the smoke of vape

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>>8277705

Vaping also has a tendency to increase ones arrogance and condescension which can result in getting them beaten up

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>>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.

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>>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.

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>>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.

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>>8277678

>You don't have to be good at maths to be a programmer

sure, if you wanna be a monkey

HOW DO YOU SOLVE THIS

Fuck you /sci/ you cuks post this shit and don't post how to solve

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the answer

is 4

>>

50 + a + b = 180

10 + 40 + b + a = 180

???

profit

>>

A new semester is nearly upon us.

What are your academic goals for this semester, /sci/?

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pass all my exams and have a 4 month break.

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>>8277579

Learn how to solve ODE's, Neural nets and Image Processing.

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>>8277579

Get physically, psychologically and financially well enough to pass a few courses this winter.

Anonymous

PROFICIENT IN INTEGRAL CALCULUS? 2016-08-17 12:14:21 Post No.8277545

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PROFICIENT IN INTEGRAL CALCULUS? 2016-08-17 12:14:21 Post No.8277545

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PROFICIENT IN INTEGRAL CALCULUS?
Anonymous
2016-08-17 12:14:21
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Then check this proof out!

useful in statistical mechanics and quantum chemistry

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>Hopetal

What's wrong with you? Is HÃ´pital.

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>>8277557

Stop trying to hurt my feelings. Joke's on you because it's not going to work!

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>>8277545

Are you an undergrad?

https://www.youtube.com/watch?v=kYB8IZa5AuE

Wtf I love linear algebra now

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>not submitting to linear-chan

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Yeah, the series is pretty great

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>>8277508

>3b1b is pretty great

ftfy

Anonymous

A random universe 2016-08-17 07:06:45 Post No.8277221

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A random universe 2016-08-17 07:06:45 Post No.8277221

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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

>>

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>>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?

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.

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>>8277158

Google BASF, now look around around your room.

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.

Anonymous

tank fire 2016-08-17 05:39:48 Post No.8277107

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tank fire 2016-08-17 05:39:48 Post No.8277107

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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?

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>>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

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>>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?

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>>8277169

Yes of course. The heat will never stop rising

whats the formula for relating exponents?

if u=y^-3 and y=u^3, then what is u when y^-4?

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if u = y^-3 and y=u^3 then u*y^4=u^3

so u^2 = y^4.

so u^-2 = y^-4

>>

[math]y^{-4} = (y^{-3 }) ^ { \frac{4}{3} }= u^\frac{4}{3} [/math]

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>>8277079

This doesn't make any sense, because quite obviously [math] u^2 = y^{-6} \neq y^4 [/math]

Anonymous

Building a Low-Cost High-Quality DIY Spectrometer 2016-08-17 05:04:47 Post No.8277043

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Building a Low-Cost High-Quality DIY Spectrometer 2016-08-17 05:04:47 Post No.8277043

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Building a Low-Cost High-Quality DIY Spectrometer
Anonymous
2016-08-17 05:04:47
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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...

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>>8277049

Should I use something else? I'm all ears on suggestions on the electronics; this will be my first project of this sort.

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>>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

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...

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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.

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>>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.

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>>8276933

>The atoms in the rod can only interact as fast as the speed of sound

what

Anonymous

Maths textbook recommendations 2016-08-17 01:58:17 Post No.8276712

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Maths textbook recommendations 2016-08-17 01:58:17 Post No.8276712

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Maths textbook recommendations
Anonymous
2016-08-17 01:58:17
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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?

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>>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?

Are any /sci/entists paranoid about being killed by a time traveler?

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>>

why would anyone time travel into the past? this world sucks, a glorious bright future awaits

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>>8276672

I don't believe in car I only believe in trains. You can't drive without a rail!

Anonymous

Neanderthals Fact or Fiction 2016-08-17 01:32:41 Post No.8276655

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Neanderthals Fact or Fiction 2016-08-17 01:32:41 Post No.8276655

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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

>had primitive boats

>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/.

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They didn't have blond hair like that.

I fucking hate retarded artists doing reconstructions they have no idea about.

>>

She looks like shakira

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>>8276702

Source? Why couldn't they be blonde?

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