Archived threads in /sci/ - Science & Math - 164. page
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I always wondered how jet engine work. Maybe that is obviously but I don't understand.
Pressure distribute in all directions with the same force. Why turbine rotate compressor and not otherwise or in another words why it rotates and air flow in one direction whet it press whit the same force in both?
>>8057382
>why it rotates and air flow in one direction whet it press whit the same force in both?
Because engineers did like 500 different engines and then 1 actually worked and they have just spent the last hundred years making it better and better.
>>8057382
Work on your fucking prose, Pajeet.
>>8057382
This might help?
I can't tell what you're asking
https://youtube.com/watch?v=ueTGjegTKoo
Shitty physcist here.
How do I learn to sketch graphs?
for example, how would you know that y=sinx/x looked like pic related?
The main things that characterise graphs are axis intercepts and the turning points.
>>8057375
Well, first you know its probably sinusoidal. Then, think of the graph of 1/x. Try plotting them together.
What is the value of y at x=0?
Why don't we have space portals yet, /sci/?
>>8057363
If it's so easy why don't you make one?
Exotic particle quantum tunneling yachting quarks
>>8057363
Because we don't have a way to make arbitrary amounts of negative energy
ITT: God tier pure math books
>>8057200
Best book on Complex AG here. Screw G&H.
This is a pretty good resource for textbook recommendations
http://math-blog.com/mathematics-books/
Anyone know a good cell bio textbook? Sick of MoBio of the Cell's inane bullshit. The only good chapters are the ones on microscopy and organelles.
Where are all the 40+ year old people in tech?
Dang, ment to post it on /g/ not on this shit board
>>8056993
kys
>>8056993
Jessica JUSTain
Hello /sci/.
There's a local math olympiad tomorrow which I'm taking, and I'm super nervous. Any advice?
Stay hydrated and get a lot of sleep.
>>8056983
>Be me back in highschool
>Did not give a shit about math
>Was having sex constantly
>Took the virginities of various girls way younger than me, like a 3 year difference
>Playing videogames up to 3 AM
>A lot of the times went to school without sleep and would sleep in class
>Heard about math olympiads...
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>>8057021
>best university for Maths
>mostly Cs
Roleplay elsewhere buddy
What is asthma, and how do inhalers help?
>>8056860
As someone who has asthma and have had it forever I can explain.
Whenever I consume something my body does not like then for some reason my breathing holes close from the inside and I start taking in only like 10% of the oxygen I would take originally, making me have to breath in really fast which then tires me out and shit.
Inhalers have a magic dust that make the holes open up again but also have the side effect of increasing blood pressure.
>>8056864
i got asthma too, magic dust? really nigger?
>>8056874
I don't know what it is man what do you want me to say? I study math, not chemistry.
Are mathematicians all retarded, /sci/?
"In mathematics, the associative property ... Within an expression containing two or more occurrences in a row of the same associative operator, the order in which the operations are performed does not matter as long as the sequence of the operands is not changed."
>the order in which the operations are performed does not matter
>the order does not matter
>associative
How the fuck did they "associate", the...
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they could call the property hotdog for all i care
>>>/lit/
Well its just means that (ab)c = a(bc)
As you can guess, it's quite nice property to have
Consider addition. (A+B)+C=A+(B+C) is a statement of associativity. On the left hand side, A and B are associated with each other, where on the right, B and C are associated with each other. At least that has always been my interpretation.
How do you deal with the inevitable heat death of the universe?
also welcome
>how do you deal with knowing that human civilization is a slave to it's biology and controlled by epigenetics, trapped in a spiral of rising and falling repeatedly for all time
>or with the fact that we've not had contact with any other intelligent life?
>or at least with the inevitable destruction of Earth and the solar system?
>>8056767
Fundamental particules are eternal.
Human brain is the most complexe object in all the universe.
The reality is always and inevitably more complex than we can imagine.
>>8056767
I hope that by that time we'll all have transported our consciousnesses to another universes or some shiet like that.
>>8056819
That's what happens when you die
http://www.ibtimes.co.uk/sci-hub-offline-elsevier-gets-yet-another-pirate-bay-scientists-domain-name-shut-down-1558645
fuck elsevier
>>8056597
>fuck elsevier
This really can't be said enough. Fuck elsevier.
Independent people should just buy sci-hub related domain names and point it to their servers. That way it becomes practically impossible to block and shut down. You can make free dns-level subdomains here by the way: https://freedns.afraid.org
>>8056597
What does Elsevier primarily publish?
I mostly read math and a very small amount of physics and I don't think I've ever even seen a book published by them.
Chasing down nerds on pirate bay is pretty sad practice for a textbook company though.
Technology has not hit its peak, VR just in its infancy, ~20 years ago everything was fucking black and white, in the twilight zone of humanities fate of self destruction or infinite progression.
Just fuck my shit up. What are the FUCKING chances out of ALL the configurations that existed in the universe I had to be born in THIS present time
>Born too early to explore the universe, born too late to explore the world wasn't a meme but in fact real tea.
>Born too early to explore the Earth
>Born too late to explore the galaxy
>Born just in time to buy psychedelics on the Internet
>>8056529
You're not born in the worst time, though.
You're born in humanity's adolescence. The time is now to take your legacy to the stars. Information previously only acceptable to the sons of noblemen is now available with a simple search inquiry.
Now, anon, is the time the seeds empires spanning star systems are planted. Don't be sad that you aren't a denizen of the distant future. Be glad that you are a pioneer for it.
>>8056537
I WANT TO KNOW WHAT HAPPENS IN THE END GOD DAMNIT!
I can barely sleep nowadays, theres so much suspense towards the human race, I want to know if we fuck ourselves up or not.
>Space
I doubt we'll be doing anything related to that in our lifetime, our energy efficiency is fucking terrible, just picture this - the fastest speeds we can reach is by dropping bombs and riding shockwaves.
let's say I want to measure something inside a population
what is the number of people I need to survey ?
bout tree fiddy
30.
All of them.
why can't we just scan each atom of the human body and log the scanned atoms as unique bit patterns and then send the bit patterns over the internet and then at the receiving end use the bit patterns to move matter in a way so that it corresponds to the original human body?
Because you are stupid
>>8056303
That's not teleportation, that's cloning. You would still die.
>>8056303
>just scan
>to move matter
Those.
What is the fastest way to calculate the harmonic sum of a number /sci/?
[math]
\sum_{k=1}^{10000000000} (\frac{1}{k})
[/math]
in python or c++
WolframAlpha does it so fast yet my c++ program takes ages
>>8056273
Hnnng
>>8056273
This whole "lol I lift =P" meme needs to fucking die. Attractive bodies are literally all genetics. You either store muscle and fat in aesthetic places or don't and going to the gym is not going to change that. Go to any cbt on /fit/ and you will see dudes who have unattractive muscle insertions and lifting just made them look fucking stupid.
Take this very girl for example. Her ass and legs aren't shaped any better than average even though 99.9% of women her age cannot squat 135 lbs with...
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>>8056273
~9*ln(10) + gamma_euler = 21.3005
use Hn = ln(n) + gamma + sth negligible
Imagine Discovering That Your Teaching Assistant Really Is a Robot
http://www.wsj.com/articles/if-your-teacher-sounds-like-a-robot-you-might-be-on-to-something-1462546621
I've got bad news for you guys.
AI is NOT just going for the stupid jobs. It's heading straight for the PhD's jugular.
Let's read a bit about Jill Watson
>Since January, “Jill,” as she was known to the artificial-intelligence class, had been helping graduate students design programs that allow computers to solve certain problems, like choosing...
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>>8056207
Why is this bad news? It's being trained to answer routine questions by looking at a dataset of questions that have been asked and answered correctly in the past. If anything this will help streamline education by removing all of that shitty redundancy bogging us down.
Also, lol at that retard who thinks we should have full disclosure about what you're talking to. Why does it fucking even matter. I think a good principle is:
>On the internet no one knows you're a dog.
>>8056278
I think the main concern is that a lot of PhD students need this supplementary income to keep them going. If the typical TA team was 9 to start with it might now be accomplished by 3 who get the same pay as before leaving most PhD students with no fall back option.
>Also, lol at that retard who thinks we should have full disclosure about what you're talking to. Why does it fucking even matter. I think a good principle is:
He probably expects you and I to know each other's...
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>>8056318
>names
>nationality
>gender
>sex
>skin color
>ancestry
>...
Where does it stop?!
