[Boards: 3 / a / aco / adv / an / asp / b / biz / c / cgl / ck / cm / co / d / diy / e / fa / fit / g / gd / gif / h / hc / his / hm / hr / i / ic / int / jp / k / lgbt / lit / m / mlp / mu / n / news / o / out / p / po / pol / qa / qst / r / r9k / s / s4s / sci / soc / sp / t / tg / toy / trash / trv / tv / u / v / vg / vip /vp / vr / w / wg / wsg / wsr / x / y] [Home]
Archived threads in /sci/ - Science & Math - 56. page
Images are sometimes not shown due to bandwidth/network issues. Refreshing the page usually helps.

File: Screenshot_20161122-163158.png (3 MB, 1440x2560) Image search: [iqdb] [SauceNao] [Google]
3 MB,
Can somone explain this to me
>>
Yes I can.
>>
Ok how do I do this
>>
>>8490678
Which part needs explaining?

File: neckbeard-fedora.png (377 KB, 594x422) Image search: [iqdb] [SauceNao] [Google]
377 KB,
Genetics. Famous "There's more variance within human races/ethnicities than between them" statement. Explain or refute.
>>
Lewontins fallacy.
>>
File: 1448364326247.jpg (169 KB, 1185x726) Image search: [iqdb] [SauceNao] [Google]
169 KB, 1185x726
>>8490628
That's true, but there are still different races.
>>
>>8490641
How is it true?

File: _20161122_132238.jpg (99 KB, 1218x815) Image search: [iqdb] [SauceNao] [Google]
99 KB,
If I have 3 parallel wires of equal length, equal distance apart, and all of current "I", what would the direction of the force be on the middle wire?

The top 2 wires have their current going to the right while the bottom wire has it's current going to the left.

I'm not sure how the right hand rule applies with 3 wires.
>>
Same directions attract and opposite repels
>>
File: freezebottle.jpg (49 KB, 973x218) Image search: [iqdb] [SauceNao] [Google]
49 KB, 973x218
Top and bottom wire cancel each other out at the middle wire
>>
this isnt the right hand rule its another rule which is wires with current in the same direction attract and wires with current in the opposite direction repel, this is the formula for the force between two wires. K is the magnetic force constand, d is the distance between them, L is the length of wires, I1 and i2 are the currents in the wires

File: great value.jpg (10 KB, 480x360) Image search: [iqdb] [SauceNao] [Google]
10 KB,
I think you should try it. It's fun.
>>
>>8490337
>>
>>8490337
KEK ! xDDDD
>>
>>8490358
?

File: timetravel.png (217 KB, 3228x936) Image search: [iqdb] [SauceNao] [Google]
217 KB,
I just proved time travel. All while giving a visual representation of how the timeline works.
>>
>>8489842
ok.

i think what you actually did was prove that it's theoretically possible to travel linearly in a circle
>>
>>8489848
Circle implies and "end", god or something turning it all off. Remove the circle, repeat lines infinitely. It was easier to show an end.
>>
Yeah, ok, no. You didn't prove shit. Drop the shrooms, you're just tripping balls.

File: 1479580869632.jpg (75 KB, 800x800) Image search: [iqdb] [SauceNao] [Google]
75 KB,
Sup /sci/. I really love pure mathematics but fuck it's the single most hardest and excruciating subject to master, but I love the feeling of finally proving a theorem all by myself and then actualizing the concept. I make A's in my math classes but I don't feel like I'm doing jack shit, sometimes I will get to a single exercise and work at it for hours, no lie. Is this how it's suppose to be or am I just slow?
>>
>>8489547
>I really love pure mathematics
>
No you don't love it that much, OP.
Yes you love to learn but you don't feel like you're doing anything maybe because you're not applying what you're learning
Consider some AppMath courses or something, you might like it a lot since it's the same as Pure but you apply that shit and get lots of cash instead of less than 40k/yr
>>
>The derivative is just acceleration
What's wrong with this one
>>
>>8489612
>What's wrong with this one
Why not the velocity?
Physicist ruin mathematics by goofily trying to apply it to the real world.

File: octagon.png (8 KB, 372x354) Image search: [iqdb] [SauceNao] [Google]
8 KB,
>>
>>8489540
I'm gonna go with triangular prism with concave sides.

Either that or extruded ninja star.
>>
>>8489540
We'll have to start by figuring out what a concave triangle is called, and how it is constructed. I propose it being the space formed by 3 reuleaux triangles touching tip-to-tip, so one of the vertices touches another triangle's vertex and another vertex touches the other triangles vertex, and so on.
>>
>>8489540
the 3d model is too ugly to tell.
It looks like an extruded curved triangle with curves as ugly as you face.

what level of elite do you have to be to become an astronaut? perfect marks, perfect health, postdoc contributions in fields related to upcoming space projects? even then you're fighting against tens of thousands of applicants for a single seat in a launch vehicle. it must be beyond stressful but i guess they can cope with it like it's nothing.

what kind of mindset do you need? you clearly can't just be passionate about going into space, or you'd burn out fast in the weeding process. do you just have to be lucky as hell?
>>
>>8489532
you don't need to be a scientist to be an astronaut

most of the science that you do in space consists of pressing a button, turning a knob, etc,
because the experiments have been set up for you beforehand by the top-tier scientists who are monitoring all the shit you do from earth

you need to demonstrate that you can solve problems and not get panicked. This is why so many astronauts were chosen from a list of test pilots

if you want an extra edge - be an identical twin
>>
>>8489532
>what level of elite do you have to be to become an astronaut?
must be a high ranking freemason and part of a large chapter or lodge.

> perfect marks, perfect health, postdoc contributions in fields related to upcoming space projects?
all projects are not space and only high altitude aircraft.

>>8489546
>you don't need to be a scientist to be an astronaut
>>
>>8489611
>must be a high ranking freemason and part of a large chapter or lodge.
damn right.
pic related.

nasa is a huge fraud. people can be bought off just like the FDA.

File: 1479777012573.png (203 KB, 1080x1432) Image search: [iqdb] [SauceNao] [Google]
203 KB,
Hello /sci/, i am not hostile and i come from /b/ for help, there is this guy who left us a riddle, and we need your help on this one, /x/ aren't so helpful so why the fuck not /sci/

>>/b/712542861

help us out here.
>>
File: Blood Dash rätsel.jpg (210 KB, 1440x900) Image search: [iqdb] [SauceNao] [Google]
210 KB, 1440x900
Solve me, and you will be.

Contact me if|---|if not do not. you have been warned.

n6gcwjbsx7qcnjxp
>>
>>8489159
maybe any medfag can help us with this, maybe it's an xray of something or i don't know
>>
>>8489159
>>8489159
Have you checked the metadata of the image?

File: F0GDVA3GRG3ZJJW.LARGE.jpg (109 KB, 1024x685) Image search: [iqdb] [SauceNao] [Google]
109 KB,
Is it expensive, or even possible, to build an amateur lab at home? What would i need? I'm amateur chem enthusiast from Germany and i think this might be a good outlet for my autism.
>>
>>8490412
check the laws of your country
but in general, yes, it is possible
it is also possible to get into way more trouble than you're ready for
at the very minimum you need a fume hood if you don't have a yard
lab technique is paid for in broken hardware and brushes with death
>>
>>8490412
http://www.thamesandkosmos.com/index.php/product/category/science-kits/chem-c3000

find a german company like this once you are ready to move on. you have different laws in germany
https://www.unitednuclear.com/
>>
File: irwr.jpg (213 KB, 1600x1200) Image search: [iqdb] [SauceNao] [Google]
213 KB, 1600x1200
>>8490450
>>8490452

File: 1478724862012.png (603 KB, 984x1124) Image search: [iqdb] [SauceNao] [Google]
603 KB,
hi guys what is 0/0
what is infinity - infinity
what is 1+1+1+1+1+1..?
whhy are imaginaru numbers a thing?
pic related my favourite scientist
>>
>>8490267
He's my favourite engineer :)
>>
i'm having a difficult time with logs and integration. want to scream.
>>
>>8490267
Can anyone link me to the source of that comment.

I want to know the context of why he said it.

File: 1468960446282-v.png (448 KB, 496x708) Image search: [iqdb] [SauceNao] [Google]
448 KB,
I recently read about Edwin H. Armstrong and how he got fucked over p.hard by the legal system.

Do you know of any other inventors/scientists/mathematicians who were fucked long and hard for trying to make progress in their field?
>>
Turing was fucked hard for being a gaylord.
>>
>>8490247
well, he wasn't fucked. I think he'd have liked that.
>>
>ramanujan
>just wanted to be autistic with numbers
>Hardy makes him eat shitty British food with no good indian veg around
>dies

>Perelman
>just wanted to be a master geometer/topologist
>chinks try to steal his credit

>Grothendieck
>just wants to generalize shit
>doesn't...

Hey i can't solver this no matter what , can you guys help me?
>>
>>8490609
Can you relate BA and AC to known quantities?
>>
>>8490616
i know the value of both of them put together other than that this is the only info that i have
Thanks
>>
>>8490621
Now state that information mathematically. But it's not the only information you have, it's a right triangle, which gives more information.

I want to learn, or teach myself, calculus, but don't know where to begin. I've no preexisting knowledge of calculus, and I'm not sure where to begin. Just need to be pointed in the right direction. It would be a huge help and I'd appreciate it greatly.
>>
>>
>>8490141

>>
File: Larson- Calc. ETF.png (2 MB, 1386x1720) Image search: [iqdb] [SauceNao] [Google]
2 MB, 1386x1720
>>8490189

For what it's worth, if you're motivated enough, the textbook in pic related (It's available online if you know where to look...the one I used to study for AP BC Calc) and Khan Academy (and maybe the Barron's Book for the AP test... They have good review material) should be more than enough...

Just make sure to do as many problems as you need to get the concepts and ask about things you aren't sure about. Whether that be acquaintances or people in /sqt/, having someone explain a...

File: zyklon ben.jpg (43 KB, 531x405) Image search: [iqdb] [SauceNao] [Google]
43 KB,
What's the absolutely worst injury a person could survive, provided they could be instantly teleported to a hospital immediately after?
>>
Just look at the most dangerous surgeries.
>>
This question is like asking "how much can we fuck up a body while keeping it alive, granted we're in a hospital". So you should look up "Experiments in the Revival of Organisms"
>>
>>8489458

japanese nuclear techs who got blasted by uranium and put on life support for 83 days while they were literally skeletons with a bit of skin and organs attached to their bodies

File: pepe_enough.jpg (7 KB, 218x249) Image search: [iqdb] [SauceNao] [Google]
7 KB,
Let's settle this once for all.
Complex numbers don't have a physical interpretation.
Yet they appear in the Schroedinger equation.
QM as a result is fucked up.
How about NOT NAMING them, MAKING WITHOUT THEM and simply using $\mathbb{R}^{2}$?
>>
>>8489086
It's because of how they describe periodic functions when added to the exponential
>>
R^2 is not a field.
>>
There are many commonly used irrational numbers that can't even be constructed with elementary operations and might as well have no physical meaning either.

File: new-years-party-guy-374694.jpg (298 KB, 1300x1219) Image search: [iqdb] [SauceNao] [Google]
298 KB,
Anyone have any tips on getting scholarships as a STEM major? My school refuses to give me financial aid and it's costing me out the bum.
>>
Be black or a women
>>
Do rowing as in the sport.
Or become disabled... fast.
>>
>>8489004
>Do rowing as in the sport
explain

File: AC050931l.jpg (78 KB, 400x403) Image search: [iqdb] [SauceNao] [Google]
78 KB,
Can you recommend me a good microscope to buy? What is it that separates microscopes used in education from "toy" microscopes you can get for little?

My younger sister has taken an interest to biology and I would like to encourage her enthusiasm by getting her a microscope for Christmas.

The one she uses in high school magnifies up to 40x. It surprises me the kind of things you can see with so little magnification. When I look for 40x microscopes on Google I get a huge range of prices. What is it that sets a good microscope apart? I assume that they use...
>>
What kind of samples do you plan on observing?
>>
>>8488893
Get one with a camera attachment is all I can say. Also you can go for a monocular instead. There is polarized light features for some stuff, lighting is important. I dicked around with a refurbished high end thing for a couple years before giving it to a school and that's all I know. You might wanna look at the refurb market, there are some real nice units for 1/3 cost.
>>
>>8488895
Once, they observed osmosis in onion cells, if i remember correctly. They also looked at the cells of their own skin. I can't remember any other things she might have told me about.

Tomorrow they are going to dissect a cow's eye, but I don't know if a microscope is used to observe anything when you do that.

What is the scientific explanation for the fact that I feel like almost all the other people are just simple NPCs? Am I some sort of psycho or what?
>>
shit, he knows.
>>
>>8488762
I don't know what kind of dumb thought process leads to this idea, but rest assured many people have it.
You're just incapable of understanding a third point of view.
>>
>>8488762
>Am I some sort of psycho or what?

Yes.

File: uranus.jpg (21 KB, 572x455) Image search: [iqdb] [SauceNao] [Google]
21 KB,
Can anyone teach me about lucid dreaming without all the /x/ bullshit that seems to accompany it?
>>
>>8488555
>>
>>8488555

http://pms.sagepub.com/content/51/3_suppl2/1039.short this study records some guys lucid dreaming technique. maybe get this article of sci-hub and see what the technique was.
>>
Test

WILL IT FLY /SCI/?
>>
definitely not
>>
File: 1429810518229[1].jpg (9 KB, 420x316) Image search: [iqdb] [SauceNao] [Google]
9 KB, 420x316
>planes fly because their wheels spin
>>
>>8474516
Yes because the wheels of the plane are free moving and frictionless

The engines are of a separate entity if themselves, with virtually nothing holding them back from the tarmac which is frictionless remember, it produces thrust and pushes itself forward

The treadmill can spin all it wants but it'll never stop the forward thrust of the plane

File: 1474796774231.jpg (931 KB, 1920x1080) Image search: [iqdb] [SauceNao] [Google]
931 KB,
Despite every popsci""""entist"""" going on about it, I've heard that science has abandoned it as a principle. Is this true?
>>
>I've heard that science has abandoned it as a principle
>>
File: Climate Change.jpg (95 KB, 800x531) Image search: [iqdb] [SauceNao] [Google]
95 KB, 800x531
It depends on which area of science you're looking at.
>>
>>8486551

Science has never even had that principle. Read a textbook and try to find "falsifiability" in it even once.

File: Graph.png (8 KB, 654x405) Image search: [iqdb] [SauceNao] [Google]
8 KB,
Let $f(x) = (x if x < 0) & (x + 1 if x \geq 0)$.
The function is not continuous (because in $x = 0$ we have a jump discontinuity), but is the function still differentiable?
For $x <0$ we have $f'(x) = 1$ and for $x > 0$ we also have $f'(x) = 1$.
Furthermore we have $\lim_{h\to 0^-} frac{f(0 + h) - f(0)}{h} = \lim_{h\to 0^-} frac{h}{h} = 1$ and $\lim_{h\to 0^+} frac{f(0 + h) - f(0)}{h} = \lim_{h\to 0^+} frac{h + 1 - 1}{h} = 1$, so we have $f_{-}^{'}... Comment too long. Click here to view the full text. 14 replies and 1 images submitted. Click here to view. >> Let [math]f(x) = x if x < 0$ and $x + 1 if x \geq 0$.
The function is not continuous (because in $x = 0$ we have a jump discontinuity), but is the function still differentiable?
For $x <0$ we have $f'(x) = 1$ and for $x > 0$ we also have $f'(x) = 1$.
Furthermore we have $\lim_{h\to 0^-} \frac{f(0 + h) - f(0)}{h} = \lim_{h\to 0^-} \frac{h}{h} = 1$ and $\lim_{h\to 0^+} \frac{f(0 + h) - f(0)}{h} = \lim_{h\to 0^+} \frac{h + 1 - 1}{h} = 1$, so we have [math]f_{-}^{'}...
>>
[math] \begin{cases}
x & x < 0 \\
x + 1 & x\geq 0
\end{cases}
[\math]

Fuck latex man
>>
I'll write it plaintext:
f(x) = x if x < 0
x + 1 if x >= 0

File: 1426553013653.png (759 KB, 976x4421) Image search: [iqdb] [SauceNao] [Google]
759 KB,
>>
File: 1426553400349.jpg (175 KB, 601x2560) Image search: [iqdb] [SauceNao] [Google]
175 KB, 601x2560
>>
File: 1426553733405.jpg (876 KB, 1000x4340) Image search: [iqdb] [SauceNao] [Google]
876 KB, 1000x4340
>>
File: 1426554118784.jpg (943 KB, 2329x2994) Image search: [iqdb] [SauceNao] [Google]
943 KB, 2329x2994

File: Can't figure out.png (5 KB, 724x163) Image search: [iqdb] [SauceNao] [Google]
5 KB,
Okay I've been working on this for some times now, and I simply can't figure out if my assumption is correct or not, pic related.

Let's say I want to find f1(x) where x=-1.
Do I simply use this calculation

a=ˣ2-ˣ1√⎺y2/y1

y2 or y1
b=————

and use the point on the chart as (x1, y1) = (2, 0) and (x2, y2) = (1, 6), then use the f(x)=b∙aˣ calculation where x=-1?
>>
>>8490158
>>
>>8490176
I'm making an assumption that the exponential function can be found using the presented calculation and wanted confirmation on whether or not I'm doing it correctly.
>>
>>8490201
Never mind figured it out.

File: chrome_2016-11-22_11-08-59.png (940 KB, 1050x592) Image search: [iqdb] [SauceNao] [Google]
940 KB,
If there is a known cancer, would the resulting higher Igf-1 levels from exercise be worth the activity knowing that Igf-1 encourages cancer growth?
>>
File: frogman.jpg (2 MB, 6000x5606) Image search: [iqdb] [SauceNao] [Google]
2 MB, 6000x5606
>tfw no lgf
>>
>>8490146
There's a compromise. Same goes with calories. Nobody really knows, and you should be able to just kill the cancer instead of doing stupid balancing acts to stay alive a month or two longer.
>>
>>8490162
but is it true that with a lower igf-1 level, the cancer will grow at a slower pace thus more of a chance that the immune system can kill the cancer cells at a faster rate than the cancer cells can multiply?

File: 33554.jpg (131 KB, 480x640) Image search: [iqdb] [SauceNao] [Google]
131 KB,
Does melted water have health benefits? My local bookstore contain only two books by ignoramus about this question therefore I full of questions.
>>
>>8490016
What? That is a tautology, because water is the liquid phase transition of H2O.
>>
>>8490016
It staves off dehydration.
>>
Water can only get so hot before it becomes steam, it won't melt

File: 1473876805522.jpg (265 KB, 1440x1080) Image search: [iqdb] [SauceNao] [Google]
265 KB,
Give me ONE good reason to use RPN
>>
It eliminates the need for parentheses
>>
File: no_equals.jpg (4 KB, 111x111) Image search: [iqdb] [SauceNao] [Google]
4 KB, 111x111
Dunno, I never used anything else.
>>
It will make your friends think that you are more inteligent than you actually are

File: UtAAsWq.jpg (6 KB, 212x200) Image search: [iqdb] [SauceNao] [Google]
6 KB,
>tfw took a functional programming course this semester
>have to sit with CS spergs
>more than half the class failed the midterm
>they're still here

>mfw
>>
File: 14-hillary-clinton.jpg (152 KB, 1200x800) Image search: [iqdb] [SauceNao] [Google]
152 KB, 1200x800
>>8489167
>>8489091
>>8485489

The butthurt is real
>>
Why would they leave?
>>
>>8489232
functional programming isn't even that useful

File: Oh Shit Wall Up.jpg (29 KB, 500x568) Image search: [iqdb] [SauceNao] [Google]
29 KB,
Why the fuck would anyone major in computer """science"""?
Why would you want to work as a code monkey with pajeets your whole life?
>>
>>8489167
Because, you might decide to double major and desire a job with \$200,000 starting as a data scientist.
>>
>>8489167
>Why would you want to work as a code monkey with pajeets your whole life?

Yeah, beats being an unemployed math/physics major.
>>
>>8489184
as if knowledge isnt the most important thing

[Boards: 3 / a / aco / adv / an / asp / b / biz / c / cgl / ck / cm / co / d / diy / e / fa / fit / g / gd / gif / h / hc / his / hm / hr / i / ic / int / jp / k / lgbt / lit / m / mlp / mu / n / news / o / out / p / po / pol / qa / qst / r / r9k / s / s4s / sci / soc / sp / t / tg / toy / trash / trv / tv / u / v / vg / vip /vp / vr / w / wg / wsg / wsr / x / y] [Home]
[Boards: 3 / a / aco / adv / an / asp / b / biz / c / cgl / ck / cm / co / d / diy / e / fa / fit / g / gd / gif / h / hc / his / hm / hr / i / ic / int / jp / k / lgbt / lit / m / mlp / mu / n / news / o / out / p / po / pol / qa / qst / r / r9k / s / s4s / sci / soc / sp / t / tg / toy / trash / trv / tv / u / v / vg / vip /vp / vr / w / wg / wsg / wsr / x / y] [Home]