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Archived threads in /sci/ - Science & Math - 101. page
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File: HowToDoIt.jpg (42 KB, 291x288) Image search: [iqdb] [SauceNao] [Google]
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How do you calculate the blue area if this shape is symmetrical horizontally and vertically with a square sorrounding it and knowing the middle lines are equally long? The dotted lines are not a part of the shape. I always fail at calculating the "smaller trapezoid" (green).
x = sides of square
y = lines we know are equally long
>>
>>8444327
x^2+xy-xh-yh
where h - height of smaller trapezoid
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>>8444330
fuck, I messed up
(x^2+xy)/2-(xh+yh)
let it be so, then
>>
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>>8444332
I wasn't quite sure whether I'm allowed to introduce h as height, without calculating it from the given variables. But I guess there's no other way.(?) Just wanted to dubble check.

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how can we save the ecosystems of our planet, reduce overpopulation, and prevent habitat destruction and extiction with our current technology and systems of government?
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>>8444323
>save the ecosystems etc etc
why?
How much of your income are you willing to give up to save some stupid ducks?

>reduce overpopulation
define "overpopulation"
Do you have some magic optimization algorithm that gives you the ideal number of people on earth? Based on what?
>>
>>8444323
Hitler 2.0 but for africans, middle easterners chinese, the uneducated, and possibly indians.
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>>8444343
its not just stupid ducks though, we as a race are killing our planet. those stupid ducks can easily be swapped out for almost any living creature larger than an ant and the meaning stays the same. all life across the planet, including our own, is affected by pollution, greenhouse gases, and industry to the point where we've fucked our planet up immensly in just over 100 years. Saving populations and entire species is more than just letting creatures go extinct, it destroys entire ecosystems, some that directly...

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Can you guys hook me up with a free ebook on basic Linguistics? Our class was tasked to do a Phonological/Lexical/Syntactical/Semantic Comparison of the English Language to other European Language/s and I don't even know how to start. Yeah I'm pretty much of an ass but could you guys help me??
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>>8444148
>a free ebook on basic Linguistics
>>
C'mon guys I know there are some of you who knows Linguistics...
>>
>>8444166
Thanks!
do you know Linguistics? got some tips??

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It preserved Aristotle's writings and continued to develop scientific innovations while science was dormant in Europe during the Dark Ages.

Christianity BTFO. White males on suicide watch.
>>
>Europeans accomplish almost every significant feat in pre-modern mathematics and science
>Arabs managed to not destroy their own civilization for a while so they could preserve European knowledge
>Along the way make a few contributions in math and optics
>Arab master race confirmed
>>
>>8444145
>Roman Empire collapses, barbarians loot and burn down its center, Western knowledge accumulated in libraries on the southern fringe
>Arabs also burn down most of it "because it's not the Qur'an", but some of them preserve some of it
>Arabs manage to survive long enough for Europe to recover
>hand the knowledge back...
>>
>>8444136
Historically, development in science and maths occurred not because of Islam, but in spite of it; as the great majority of so called "Muslim scientists" were not Muslim Arabs, but Persians, Greeks and Spanish.

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>>8444043
filename describes the thread perfectly, bravo
>>
>paper title starts with "On..."
>>
Tfw my research poster presentation begins with "Towards..."

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Explain yourself /sci/? You know we will get rid of you on the day of the rope too?
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>>8443920
Most people in stem are:
>removed from none-white areas and as such don't see the delirious effects
>immersed in the most pozzed work environments in the world (universities)
>not seriously interested in politics
It is telling that the profession that has the most right wing members is economics.
>>
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>>8443920
What a psychologically weird post.

Scientists are liberal. I'm not liberal. Scientists are supposed to be smart. So they should agree with me because I must be smart. I'll kill you if you don't agree with me, you scientists. Now they will agree with me and I will be smart.
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>>8444223
>Scientists are liberal.
I didn't see a single scientist asociated with BLM, pro-migration groups, blindly supporting minorities, pro-muslim, LGBT activist or any other destructive libtard agenda.

Liberals are notoriously anti-science. Being a centrist is as far as scientists get close to liberalism.

Anyone have an intuitive definition when two units are multiplied to create a combined unit?

It's pretty easy to find an intuitive sense for division, such as velocity. For every interval of time, there is a change in position. How about something like Force? for every second squared there is a change in "Kg*m",wtf does the latter mean?
>>
for every acceleration of a kg there's a force
>>
most of my intuition comes from recognizing the two chains

1) position --> speed --> acceleration
2) force --> work/energy --> power
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>>8443865
ignoring the seconds, what does kg Ã— meters explicitly mean?

Or how about work, Newton times displacement, what is the intuiviatw sense behind that? For division it's "per".

>>8443870
Yeah I always thought of things in that order. But work is the integral of force and displacement, and power is the slope of work with respect to time. And I'm having trouble finding intuitive sense for an integral, or multiplication between two units,...

So I'v worked for a company that has been researching and developing the use of rare earth metals like neodymium to create an apparatus that can draw energy from the casmir effect. I personally don't do very much of the work, but, so far, we have succeeded in doing this and we had hired a man off the streets to take credit for what we did in order to keep our budget when things went bad with the people above.

Unfortunately our street man we hired was framed for money laundering by an unknown entity that really believed he invented our equipment and is now serving...
>>
>What is your education level, where did you attain it?

>What is the funding for the research like? How fast is progress?

>Where have major hangups in methodology come from?

>Also, screenshots or it didn't happen
>>
>at what age did you start making up elaborate, exciting stories for strangers so that you could escape your menial life and life vicariously through this fictional character you've made for yourself?

>what mental disorders have you been diagnosed with, or, if not diagnosed, do you suspect you show signs of?

>what aspect of your identity are you that unsatisfied with that you make up fake ones online?

>why did you drop out of community college?

>>
>>8443793
>>8443820
Most of your questions are bating for personal information that would potentially put someones life in danger. Ask a real question and stop baiting you commy piece of shit.

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I had a dream a few days ago, and it was probably the coolest dream I've ever had in my life.
Quick backstory, I have somewhat of a fear of large objects, or more specifically, the thought of how small I am in comparison to large objects (Skyscrapers, mountains, etc.) I visited NYC for my senior trip, and was very startled by all the skyscrapers there. I'm not afraid in a sudden, sharp bolt of fear thru my body sort of way, more of an overwhelming feeling. This fear has, oddly enough, makes me fascinated by the scale and size of planets and distances within our solar system and universe.
In my dream, I was in the backseat of a sedan with two or three other people, I didnâ€™t know who they were, I couldn't tell, this part of my dream was foggy, I felt comfortable with them, and I was wrapped in a blanket. We were travelling down a secluded road in the night sky, with no light pollution when all of the sudden I looked up, and there it was, f*cking MARS right next to the moon! Now normally, irl, I'd sh*t my pants, but in the dream, I couldn't even be afraid, I was too fascinated by what I saw.
Mars was so close to us, that I could clearly make out the ice caps, Valles Marineris, and most of the surface scarring. Mind you, it was very odd to be in this blurry dream state in the car, then look up and see this image of Mars plain as day and to see all of its features in such detail.
Funny part is: It wasn't hurling towards us at a super-fast rate or anything like in a nightmare, it just hung in the sky from my perspective, however, it was apparent to me that it was heading towards us, and was going to crash into the Earth. I knew this in my gut, and I made a passing remark to the passengers in the car: "Huh, hope that isn't heading towards us." Even though I knew it was, then I pretended that it was no big deal, and looked back into the car, somehow thinking if I didn't acknowledge it, things would be fine, and the Earth would be saved. End dream. Cont . .
>>
I can't draw worth a damn and I couldn't even draw a car to save my life, so I just made stick figures to simulate the conversation I had with the passengers. Obviously, they are not to scale. What IS to scale however, is the size and location of Mars in my dream next to The Moon.

I do have some question for you smart space doctors out there if you would answer them please:

1.) If Mars appeared this size in the sky, how far away would it be from Earth? From the Moon?
2.) Would Mars be attracted to the moon and collide with it? Or would it collide with...
>>
Shameless bump, posted this on multiple websites and have to know
>>
Sorry OP, I have no answers for you.
But I have questions that have to do with what you think:

What is the probability of a fugitive planet enter in our solar system? What is the probability of collision with our planet?

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I'm bored. I need some intellectual enrichment.

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>>8443744
why am i so alone
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>>8443744
Let $F: \comp^2\to \comp^2$ be given by F(x,y)=(p(x,y), q(x,y)) where p and q are polynomials. Assume that the Jacobian determinant $p_xq_y-p_yq_x$ is a non-zero constant.

Show that the components of $F^{-1}$ are polynomials.

(This was a fun extra credit problem in my complex analysis class).
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>>8443750
OP was asking for hard problems, not trivial bs like this

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why the Paleomap is wrong.
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http://www.poikestheory.com.br
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Interesting but expanding-earth-tier.
What I don't get is how the comet increases Earth's volume by 20%? It would have to fucking huge, not what the size of supposed crater implies.

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Is Many-Worlds really the best way to understand what's going on in quantum mechanics? Taking the formalism literally seems a whole lot more conceptually palatable and far less spooky than things like action-at-a-distance, hyperplane dependency, retrocausality, macroscopic superpositions, etc etc. Why does the idea scare so many people when the alternatives are far worse?
>>
because physicists like to feel like they're unique special snowflakes
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>>8443656
>physics
>>>/x/
>>
>>8443656

>Why does the idea scare so many people

Scare in what sense?

Might be reading you wrong here, but it looks like you are assuming that if someone doesn't hold many-worlds to be true, it must be because the idea "scares" him or her ("scares" as used by you might merely refer to something the person finds uncomfortable to consider).

But might it not also be possible that someone is perfectly comfortable considering the full implications of many-worlds, and simply finds the notion unconvincing? It is both unprovable and unfalsifiable, which, to me, makes it very difficult to care about. Might not other people have similar opinions?

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Was devoting your life to science worth being alone on Friday night?
>>
You should ask yourself if going out on Friday is really all it's cracked up to be, or if perhaps you're just regurgitating one of our culture's most virulent myths.
>>
>>8443453
>inb4 HA HA YOU DON'T HAVE FRIENDS AND YOU HAVE A SMALL PENIS AND YOU ARE A VIRGIN
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>>8443450
Nope. But I've got \$100k in student debt, so there's that.

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Hey guys, I think that I can strengthen rule 34. Rule 34 states that if X exists, then there is porn of it. I will show that X exists IF AND ONLY IFF there is porn of it.

Proof: Suppose that X exists. Then, there is porn of it by rule 34. Now, we prove that the converse is also true. Suppose there is porn of X. Then porn of X exists. Since X is a subset of porn of X, it follows that X exists. So, we now have that X exists iff there is porn of it . QED
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>>8443149
X is not a subset of porn of x.

Dumb ass.
>>
I see you're taking discrete math this semester, compsci faggot
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>>8443157
I should rephrase that: X is an element of the set of all porn of X

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>>8443142

faggot
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>>8443142
Why the fuck do you need a trip code for this? Kys
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>>8443142
more?
It would take years of continuous full time study to absorb the material in all of those books
Why are you wasting time adding to a list of books you already won't finish when you could be reading one and getting closer to your goal?
I'd bet everything I have that you don't complete a single one.

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Sup /sci/, /tg/ here, I'm running a sci-fi tabletop RPG campaign and I want it to be sorta realistic.
(in case you didn't know, tabletop RPG is where nerds get together and pretend they're elves, orcs or, in this case, spaceship pilots, yes, the dungeon and dragons stuff)

General gist of the setting is
>living on earth kinda sucks now (doesn't matter why, global warming, atomic war etc.)
>humanity forced to move outside earth
>builds a few Stanford toruses
>builds a few self-sustaining colonies on mars and satellites, veeery slight terraforming
The setting happens in the space between earth and mars, it's somehow lucrative to trade resources from one place to another and it's just as lucrative to try your hand at robbing those who do, and it pays to protect valuable cargo, also asteroid mining fits somewhere in that cycle of life.

How would space battles work with a tech level only slightly ahead of ours (torpedos, not lasers)?

Feel free to rectify anything that sounds too far fetched.
>>
>>8443121
>>living on earth kinda sucks now (doesn't matter why, global warming, atomic war etc.)
If you want to do tabletop RP properly, it does matter why. No one moves to Mars without a good reason. Stopped reading there tbqh
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>>8443124
Just calling it "the great cataclysm" and shrouding in mystery is enough, I'll pull something out of my ass when the time comes, focus is on the here and now.
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>>8443121
>How would space battles work with a tech level only slightly ahead of ours (torpedos, not lasers)?

You want to know how wars will work in like 10 years?

Here is our army of hackers. Boom, got access to the enemy spaceship's database just for enough time to print the table with their uses and hashed passwords.

Boom, tricked their computers into believing I am the system administraror.

Boom, opened all doors, dropping cargo and humans to space.

Boom, killed anyone.

Who has time for lasers when the opposing team has 10 mathematicians trying to find a way around your security.

50% pregnancies failure, so huge number that I checked it on several sources.
Is this specific to humans or true for all mamals? Are half of oviparous animals eggs not hatching for all species?
>>
>>8443108
Don't forget about all the anti-masturbation people who claim that sperm is life, and that masturbating is murder, ignoring the fact that even when you ejaculate into your wife's vagina, at most one out of billions of sperms will result in life, with the rest dying.

As for your question, it is specific to humans. Humans have terrible conception rate when compared to other animals. A couple having sex for a month will only get pregnant 18% of the time, over an entire year you're still only talking...
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>>8443130
"Every sperm is sacred" lol. Spermatozoa are quickly disposed if not used it, abstinence would spare none.
These pregnancy failures doesn't eliminate all anomalous embryos anyway. And it's not like most people hate trying but a bad time for the others like exclusive homosexuals
>>
>>8443130
This is a strawman. The Catholic Church is opposed to masturbation on the grounds that sex was designed for procreation and using your body in a sexual way for anything other than making children is a sin. The church believes life begins at fertilization. You might find this ridiculous but it's a completely different position than thinking sperm are humans.

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Ok so I hope this is /sci/ related enough but I think it can be considered engineering, so maybe the more homosexual of users can help me here:

Will I be able to smoke DMT with a pipe like this? I know that you have to slowly vaporize that shit for it to work, and the plan is to hold a flame close to the lid to get just enough heat convection going.

Then I am not sure: should I breathe it in while still vaporizing it, or should I let ot build up inside the corpus and then take all at once?

I know that you can smoke a bottle bong in this way with hash or...
>>
Forgot to mention that Im not some hippie who thinks he will get enlightened from this shit. Just bored on a friday night and I feel like seeing fucked up things for shits and giggles. Dont need any advice on psychedelics on general either. Just advice if this works...
>>
>>8443091
Also pic should be turned 90Â° clockwise. Didnt see it on the phone and didnt bother sending everything to the PC first...
>>
>>8443091
Seriously? Just smoke it out of an apple..

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watch this nigga struggle with the epsilon-delta definition of a limit
>>

>>
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You forgot to mention that it was for a sequence of reals, not even for a general metric space.

Fucking brainlets, when will they learn?
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>>8443031

Lets see you do better brain let.

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Will we ever know for sure if P=NP or not?
>>
If someone proves it yes, otherwise no
>>
We know for sure that $P \neq NP$. No-one just has not proved it yet.
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>>8442985
>Will we ever know for sure if P=NP or not?
Maybe.

So these are the Analysis textbooks that I got from the /sci/ textbook collection.

Recommend your best Real Analysis textbooks and state why you think they're so great.

From light reading it seems that Terence Tao's the most rigorous of all but it doesn't seem appropriate for a regular Real Analysis class.
>>
>>8442897
Forgot to mention that any other math textbook discussion is welcome.
>>
>>8442897
How many other math subjects have you studied?
>>
>>8442906
First year math student. Analysis and Linear Algebra are my first experience dealing with rigorous math.

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It makes too much sense to not be true.
>>
>>8442785
i feel this way about string theory, except there's no evidence so i'm not stupid enough to admit that to anyone.
>>
This the most naive theory one can believe.
Some say they have seen ghosts?
>its bug lol
>le glitch in the matrix
...
You can 'explain' everything while not explaining anything.
>>
>>8442785
yes, totally agree... and there are way too many presents around christmas for santa not being real. and even more, there are coins *and* teeth... coincidence?

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Nobody knows how to do this on request ... not even the mods ???
>>
kill yourself brainlet
>>
Do you want to use bernoulli's equation?
>>
>>8442818
can we is the question... bernoulis equation has circumctances ..

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>sit it on digital signal processing class to see how much of a joke engineering courses are
>professor says Dirac Delta "function"
>>
https://en.wikipedia.org/wiki/Dirac_delta_function
>if it's not of class $\mathcal C^\infty$ then it's not a function
Physicists need to go.
>>
>>8442740
How many times do we need this shit thread?
>>
>>8442791
It's not a function, you dumbass. It's a probability space on $\mathbb{R}$ with all the measure concentrated at one point.

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Why aren't you using a sliderule?

You know calculators ruin minds right?

All the best at mental math trained using sliderules and abacuses to train their minds
>>
>>8442703
Why don't you just memorize your constants and lectures like a normal person. Fucking writing and tools are making the youth mentally weak these days.
>>
>>8442703
I don't care about being really good at mental math.
>>
>>8442705
Kids these days can't even triple integrate on paper, let alone in their head

This generation needs all the help it can get

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Are auras real and can we see them?
>>
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>>8442698
no, no.

>>>/x/
>>
>>8442698
yes, everything is real, you just have to imagine it
>>
yes. also don't eat animal products there bad for youre karma

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Can anyone solve this hard fothermucker of an integral?

And also, does /sci/ know any good books on solving integrals?
>>
>>8442662
cleo knows all
>>
mwahahahaha
>>
>>8442662

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What is it?
>>
>>8442589
a cloud of material not dense enough to sustain fusion
>>
>>8442589
A black hoe.

Not a typo.
>>
Gnome logo

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MATHS BTFO
>>
>>8442410
I'll bite: shouldn't it be 'scientists btfo'?
>>
Tesla is a meme scientist.
>>
Experimentalist hates theory, news at 11!

Chronic insomnia has no cure
Modern medicine can address only short term insomnia

No cure
>>
You could try sleep deprivation cycles and enjoy some efficient poly-phasic sleep.
There is guided relaxation for sleeping.
There's a multitude of ways to force sleep.
There's a lot of accurate research about how various diets affect sleep.

What exactly are you saying OP? Other than you're a meme spewing faggot? I want to help you, as sleep is a bit of my forte, but I need you to stop being a faggot and talk to me first.

Side note, there's no cure for insomnia like there's no cure for obesity.
>>
>>8442374
>I want to help you, as sleep is a bit of my forte
Oh, cool, are you a sleep researcher? I did some sleep research in my undergrad and it was pretty neat.
>>
There is a fix, not a cure.

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