Archived threads in /sci/ - Science & Math - 217. page
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>Do I just need to ace all my STEM subjects?
>Or is there more to it than it seems
Help me out my civilized /sci/
>>7999050
You're on 4chan, it's already impossible for you to become an astronaut.
>>7999050
All I know is you need to go to MIT or Harvard to become an astronaut.
>>7999050
these guys aren't just smart. they are in peak physical condition and are the best humanity has to offer. most are ex military jet pilots and shit. so your feeble neckbeard ass isn't going into space.
integral of f is the area under the graph
but what is integral of xf(x) ?
The area under the graph of [math]x \longmapsto x\,f(x)[/math].
>>7998946
x^2f(x)/2 - ∫x^2f'(x)/2 dx
xF(x) - ∫F(x) dx
If f has a Taylor seriesz it's an equally comfty series
Have you ever had a dream, wich changed your personality?
What do dreams with us?
>>7997061
I frequently have nightmares which also happen to be lucid dreams. I am consciously aware but I don't want them to stop, because reality is so much worse.
I sometimes think it's just one single guy that makes all these chakra dmt pics you see all the time.
>>7997072
>t I don't want them to stop, because reality is so much worse.
This,
If you really are an academic then you should be able to prove this.
Take your time, I'll wait.
>>7995787
Can't be proven, but
[math]\Delta 1 \Delta 1 \ge \hbar m[/math]
gives us a lower bound.
We start with the axiom that by definition x:=x
Hence, by substituting x = 1 into the equation we get 1 := 1 which degenerates into 1 = 1
>>7995793
Hi /sci/
which engineering do you study and why?
chem eng(germany), finishing master this summer
its nice to read about astrophysics or things like LHC, but i wanted to know about my direct enviroment i guess.
>>7995412
Mechanical
My parents told me to.
>>7995412
mechanical
my parents told me to
they want me to work for nasa
Hey /sci/, do you think that one can learn quantum mechanics without going to university for it? I'd like to make physics a sort of pasion and am just wondering if it's possible for me to learn quantum mechanics.
>>7995259
No.
The hundreds of hours of lectures on youtube and the hundreds of textbooks on Amazon are all there to trick you.
In order to learn quantum mechanics you must pay to enroll in a university and have a professor fill up a really big needle with quantum knowledge and inject it directly into your brain.
It's the only way.
>>7995259
If you haven't figured out how to learn any other type of physics on your own, why would you be able to learn quantum?
>>7995276
This desu senpai
COULD YOU FLY A HELICOPTER IN THIS TYPE OF CENTRIFUGAL SPACE STATION??? PLEASE EXPLAIN
>>7990970
Of course. The entire thing is pressurized to 1atm and there is inertial gravity acting on the air and the helicopter (initially.) Once the copter is airborn and begins to change direction, the inertial gravity will be negated. The design of the copter will need to take this into account so it can compensate for this change. A normal helicopter would be able to hover, for a short time, but changing direction and continually hovering will cause it to go out of control eventually. This is because the higher it gets and...
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>>7990981
>the longer it hovers, the more the ground below it will rotate away from it
But why does this not happen on Earth?
>>7991169
Because helicopters on earth are held in place by real gravity, not artificial gravity.
Does this look like anything other than a bruise? Had t like 5 days now and it doesn't seem to be going away
Looks bad OP, especially if it isn't going away. Go to a derm
OMG! That is necrotizing fasciitis. You must amputate your leg immediately.
https://en.wikipedia.org/wiki/Quantum_suicide_and_immortality
Is it possible /sci/?
>>8001576
Test it out and let us know in the next universe.
Delicious kek
>>8001578
The thing I'm worried about is, if it's real, how do we fall asleep? I mean your consciousness is gone during slow wave sleep, when I don't revert to a parallel universe where I'm awake. Right?
It is supposed that we have a decimal system because we have 10 fingers. An alien sees the sum 15+5 and answers correctly 22.
How many fingers does the alien have?
A-10
B-6
C-22
D-8
E-15
P.S. Could you give the answer + the demonstration.
P.S.S. Sorry i'm new here so i don't know if i can ask this here or if there are threads for this questions.
>>8001388
it's 12
>>8001388
I got 8.
>>8001412
tuck your thumbs in and count, everytime you get to your last finger, count it as a multiple of ten.
so
1-2-3-4 5-6-7-10
11-12-13-14 15-16-17-20
21-22
What is the iq of an gorilla
depends on the gorilla
Fuck off already.
>>8001113
higher than that of your avg /sci/ "physicist/mathematician"
What is [math]\aleph_2[/math]? How is it different from [math]\aleph_1[/math] ?
What would [math]\aleph_{\aleph_{\aleph...}}[/math] be?
As much as it pains sci to hear this, one or the more recent vsauce videos does a pretty decent amateur treatment of the topic of cardinality
>in b4 REEEEEEEEEEEEEEE
>>8002372
It's what I saw that made me want to ask this. He gets to [math]\aleph_1[/math] as the set of all reals but leaves off there. I'm trying to figure out how the later cardinalties are different.
>>8002381
I'm pretty sure the way he explains it in the video is using the powerset of N1. I don't think this powerset is N2 but it proves that there's a set that's larger than N1 out there...then he says some complicated shit that basically means "we can define N2 because math is all about definitions and doing whatever the fuck we want". Good luck getting a better explanation than this without taking a set theory course.
What is your thoughts on Khanacademy?
poo
in
>>8001806
That seems like a bug
Hey guys, do any of you have any tips for me what to look at before going on mechanical engineering?
>>8001206
Get good at inventor and classical mechanics
>>8001206
Learn Python, AutoCAD, and some sort of parametric modeling program. Maybe watch a few beginner engineering courses on youtube like https://www.youtube.com/watch?v=vyCIiWZ-iwc
>>8001206
Choose yourself a field ( hvac, design, automobile industries)
Learn at least 1 coding language ( phyton, c, c++)
Learn Matlab
Learn 2 cad programs ( AutoCad is essential but userbase will get smaller overtime, Solidworks, Inventor, Catia V5 especially for automobile industrie)
Learn at least 1 language apart from your own.
Can we talk a little about proofs? When I'm proving something in math, how do I know it's rigorous enough to be acceptable (without checking the answer)? I've been through Logic by hurley and am used to doing it line by line, listing prior statements and axioms which can easily be supported by truth tables.
Now I'm working through pic related and can't figure out what standard I need to hold myself to. He uses lots (relatively) of english, and doesn't step through the proof. I hear a lot that this and apostol are super-rigorous, but to me they seem kinda willy-nilly (however really, really well structured). What are the proper methods of proof I should employ?
>>7998053
>doing it line by line, listing prior statements and axioms
That's terrible
>which can easily be supported by truth tables
That's retarded
It's impossible to really make a mathematical proof 100% rigorous in a practical way. Instead take a cue from the proofs in whatever texts you're studying as to a level of acceptability. For example if you're just beginning to learn algebra or something you might write out all the constructions completely and be very formal with your symbols and formulas. But once you learn more and get used to standard techniques you can just say things like "construct the standard quotient and project down" or "clearly this subset kills all the elements in this...
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>>7998053
Just stick to the definitions, if you understand the definitions you will know what you have to prove.
