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Archived threads in /sci/ - Science & Math - 133. page
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>tfw i use a,b,c instead of x,y,z in Calculus.

How evil are you /sci/
178 replies and 30 images submitted. Click here to view.
>>
>>8379998
I use random japanese characters
>>
>>8379998
I use newton notation and I never add the constant after integrating an indefinite
>>
D,L
d,l
different conventions?
surely there will be no confusion!

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Is Dark Matter the "luminiferous aether" of our time?

If no, why not? It seems the truth will embarrass many people in research.
87 replies and 3 images submitted. Click here to view.
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>>8384792
what if it's not matter?

sounds like they should have called it "dark mass".
>>
>>8384792
There's a lot of evidence for dark matter. If it turns out there's another explanation, nobody will be embarrassed. That is what science is, you make observation and try to explain them.
>>
>>8384802
>There's a lot of evidence for dark matter.
Actually there is no evidence of dark matter. It had never been observed.

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"The problem is energy... I thought we could solve that with a large solar panel array"

How are solar panels a good idea on Mars? They're heavy af so taking them there will be ridiculously expensive, and producing them there will require crazy mining operations to get the raw materials you need as well as factories to actually process these materials and make the panels. This in turn will also have huge energy requirements which will be very prohibitive if you don't have the solar panels there in the first place.

Furthermore, the intensity of...
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>>8378290
Yeah, solar panels will work just fine. They can spend the extra money to get them up there. This doesn't seem to be a cost-saving or money-making venture to me. If one company can get a real foothold on Mars that will lower costs from everyone else then it is a huge step forward for everyone.

Dust and half the sunlight isn't a real problem as demonstrated by the rovers. Nuclear is more hassle than it is worth at this moment. It may be good later on though. It is best suited for satellites and unmanned...
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>>
Air isn't dense enough for wind.

Combustion fuels are to much mass and no free oxygen on mars.

There is a critical shortage of plutonium for RTGs. RTGs are only good at providing a small steady current for a long time. Plus the God damned hippies protest against them.

Uranium or thorium fission power plants are massive and need someplace to dump heat.
>>
Does launching a rocket require a lot of electrical energy anyway? I'm guessing most electrical requirements will be for life support systems.

I can't imagine they'd actually want to use EVs on Mars. For exploring a planet, you need the range, payload capacity and independence of a chemical engine. It's not like there's an atmosphere to pollute.

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>his favorite area of math is category theory
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>>
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its literally the comfiest
>>
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>>8378830
spotted the analyst
>>
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category theory is pure philosophy, not mathematics

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explain complex numbers to be like i'm a highschool dropout that found algebra hard
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>>
extra component in other dimension
>>
>>8382040
Square roots of rationals do not generally exist in the sense of calculation. But you can model them as if they existed.

For instance, there is no rational which when squared is equal to 2. So when you do arithmetic with the square root of 2 you just have to carry it around as an uncomputed term. But there's nothing special about doing this with 2. You could also do it with -1.
>>
Think of it like this: counting numbers you learned in elementary school:
>0 1 2 3 4 5 6 (...)
Okay, now say there is an extra dimension at the other side of the 0, we call them negative numbers, denoted by a - character in front and they represent shortages for example. Our number line now becomes:
>(...) -3 -2 -1 0 1 2 3 (...)
Hmm, quite strange. When we take a square root, we can only really take it from a number >=0, since what number squared could ever equal a negative number, if (-1)*(-1)=1? Alright, let's yet again define a new number i^2 = -1 such that now, we can also take square roots of our newly acquired negative friends. Lets represent these new numbers as being orthogonal to the numbers we previously know, since it's basically like you're representing two different types of quantities (those that square to positive and those that square to negative). We now acquire
>....i....
>-1 0 1
>...-i....
and we are at what you now already know. So really, if you are comfortable with us expanding positive numbers to the negative numbers, you should feel comfortable expanding the real valued squares to the negative valued squares. Turns out this expansion has some really cool and useful properties, which is why you need to know about them.

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http://www.iflscience.com/environment/no-turning-back-as-earth-permanently-passes-co2-threshold/

What do you guys think of this? Fear mongering, or actual end of the world stuff?
175 replies and 31 images submitted. Click here to view.
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>>8380952

>permanent

So does that mean we don't have to hear liberals complain about climate change anymore since it can't be helped now?
>>
fear mongering, the problem with humanity is global warming it's pollution. We're being too wasteful and fucking up our land and water. That's something that's going to affect us much more than having warmer weather.
>>
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>>8380952
>this value is mostly symbolic
sadly not the happening we're waiting for.

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What is your major/specialization and why do you love that subject?
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>>
Specialize in industrial and municipal water solutions, love it because it's water how can you hate it and I am also good at it.
>>
Computer Science because I get to be in control, use my creativity, and I generally don't have to deal with the irrational apes that inhabit this planet and their social games.
>>
>>8379941
Majoring in math. I love math because it is comfy, I am good at it and presents a lot of opportunities for my future.

They also call me 'the mathematician' at my job and that's also cool.

Tell me about climate change /sci/

I believe in it, but I think that I believe in it for the wrong reasons.

>biology student
>I'm very used to being told that climate change is real by professors
>mostly take it for granted after seeing graphs
>tons of horrible implications for our planet
>why would they lie

What do you think is the best way for me to experience climate change myself? (i.e....
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>>8376398
Climate naturally changes, we've just sped it up.

/thread
>>
>>8376398
yah, i mean if you want evidence you can find it down any avenue you really want to look.

if you ask "has the climate been acting strange lately?"

has the climate been acting uncharacteristically on a larger scale?

do the effects of these changes result in shifting weather patterns? why?


whereas if you look at the science against climate change, there's really not a lot. the best you will find that carbon dioxide is not the biggest contributor to climate change. and that's...
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Get a two large bottles of water, add seltzer to one, and screw on the lids. Then direct a bright lamp toward both bottles for a few hours and measure their temperatures afterward. You should find that the bottle with seltzer water (more co2) is quite a few degrees warmer. Now extrapolate this to earth. The only thing humans have added to the atmosphere in large quantities over the past century is co2. This is because we burn fuels (containing co2) that have been buried for ages (kept out of the atmosphere). Water vapor, although it has greenhouse like effects, has largely kept...
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Will anyone be staying up tonight to watch the Rosetta probe crash into a comet tonight?

They'll be live streaming it here

nature.com/news/rosetta-crashes-into-comet-live-from-the-nature-studio-1.20684
202 replies and 47 images submitted. Click here to view.
>>
Now i will, thanks senpai
>>
>>8381430
just found this out... guess I'm staying up.
>>
thanks m8

>probe hits comet
>Deutsche Bank implodes

exciting friday

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I popped an inside out pimple near my balls and my balls are now swollen can anyone help me?
15 replies and 2 images submitted. Click here to view.
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>>8384378
yeah, drink bleach
>>
>>8384378
how much do they hurt, be honest so we can help
>>
Quiet a bit when i move

Anyone knows something about DSP here?

I am trying to measure the similiarities between the power spectrum of two audio signals, but I don't really know how to do it.

I basically want to end up with a plot with peaks where the spectrum is the same.

I would like to understand how to do it mathematically, and then use scilab or matlab to do the computation.

So, any help or reference would be hightly appreciated.
12 replies and 2 images submitted. Click here to view.
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>>8384084
Do you currently have them in the time domain?

You don't care about phase at all or do you?
>>
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U just need dat FFT https://www.mathworks.com/help/signal/ref/spectrogram.html
>>
>>8384265

Hey,Sorry I just came back.

Yes, I exported them to scilab with the command

[x,S,bits] =wavread("D:\Trabajos\Musica\Proyecto delay\basic delay sin.wav");

So, the signal would be on the variable "x".

Let me explain a bit further.

One is the original signal (an audio track)

The other one is the original signal with a simple FIR delay applied.

The transfer function of the delay (basically a comb filter) is H(z) = 1+gz^(-M), where M = delay time...
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Why I am not surprised by this?
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>>8383886
Top kek. Not surprised either. Betas vote for lib-tards
>>
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>>8383886
Color me surprised!
>>
>>8383886
>links nbcnews article about a commercial, not an actual scientific study as proof

Also

>black bulls
>low T

kek

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Can one be intelligent if they're terrible at math?
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>>8383583
yes but you need to do math to get smarter.

anyone intelligent enough to do math is smarter than everyone who chooses not to do it even if they struggle at it

also

even if youre dumb and bad at math the version of you who chooses to do math is smarter than the version who doesn't.
>>
>>8383583
If you were prepared to accept the truth, you wouldn't have bothered asking.
>>
no. sorry.

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>tfw studying category theory for the first time

if i continue down this path will i slowly transcend mankind?
18 replies and 8 images submitted. Click here to view.
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We all slowly transcend mankind.

It's called aging.
>>
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>>8383563
damn..
>>
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>>8383562
Most definitely OP.

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>he majored in STEM
>he keep 100% of his money in a bank account

why are you all so bad with money? i mean thanks for hiring me to clean up your mess but jesus some of you are down right retarded
25 replies and 7 images submitted. Click here to view.
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we make like lots of money and we dont want noone stealing it so yeah we jus put that shit in a bank, its normal
>>
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>hiring people to clean up your financial situation
anyone worth their salt does it for free since the companies they invest in for you will pay them
>>
>>8383555
>not knowing how to conjugate verbs correctly
Kys

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I have an economics exam tomorrow and long story short I skipped a lot of classes, I've been studying the entire week but I do have a lot to still study, How do you pull correctly an all nighter for an exam instead of a homework or project or whatever??
22 replies and 2 images submitted. Click here to view.
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>>8383440
>How do you pull correctly an all nighter for an exam
you don't. You read your study materials and take notes until a sensible time of night to go to bed, and show up to the exam well-rested and after a hearty breakfast.
>>
>>8383443
you sound like a faggot
>>
Economics is easy af. Supply vs Demand graph every problem and follow what the graph says

Help me out here. We have a Facebook group where all Calculus 1 students post questions for help and what not. However, the day before our first test this girl posted an exact test question (format and everything) to the group and she was able to solve it with our help. Do I report her or just mind my business? I'm kind of pissed by the face she probably had the entire test before us.
17 replies and 2 images submitted. Click here to view.
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>>8383300
>Facebook
stopped reading there
>>>/reddit/
>>
>>8383300
report it you fucking idiot
remember youre competing against everyone in school, so find ways to screw her and everyone else up and come out as at least one of the top 3 of the course
>>
>>8383300
I'd report her. Do it anonymously or in private, so you don't look like a snitch.
I just hate cheaters tbqhwyrnf

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How accurate could you make an algorithm that predicts the number of replies a post will get?
18 replies and 5 images submitted. Click here to view.
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>>8383090
This is a perfect application of machine learning.

Equip a program with only the tools to browse 4chan. Have it request the catalog multiple times to keep track of posts that come and and go and so that it can create its own internal catalog of alive threads.

Then through another thread (in the multi threading sense of the word) it should browse the links it has stored in its list (which would be the threads) to see how many replies they get while it keeps measure of time and it stayed alive and replies.

Obviously...
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>>
One important variable that has a big impact on the number of replies and which is very easy to determine is the time and weekday at which the post is submitted.

I think one would be able to make reasonable guesses when considering aforementioned factor plus applying statistical methods on a comprehensive dataset of "content - number of replies".
>>
>>8383090
Wildly inaccurate is my guess.

I'd hit it with the meme hammer and do some variable sequence length regression analysis by feeding an LSTM neural network character level posts and training it to output the number of replies.

>Human mathematics hasn't even extended the notion of the [math]\color{#b5bd68}{n}[/math]th derivative of a function [math]\color{#b5bd68}{f^{(n)}(x)}[/math] to complex values of [math]\color{#b5bd68}{n}[/math]

You are like little babies

t. Alien Mathematician
11 replies and 4 images submitted. Click here to view.
>>
dumb frogposter
>>
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>>8383068
I can assure you those of us being oppressed are making major strides but we are under threat of reprisal.
>>
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>>8383068
>dumb frogposter who can't use jsmath tags properly also cant use google
what a surprise

https://en.wikipedia.org/wiki/Fractional_calculus
>Fractional calculus is a branch of mathematical analysis that studies the possibility of taking real number powers or complex number powers of the differentiation operator

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>tfw scientists are just starting to catch up to where philosophy was 2000 years ago
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>>8383051
>But there is no way there are any cheat codes or player characters. That would be absurd.
>>
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>>8383055
thats what you think dumbass.
>>
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I understand that agitation and decrease in environmental pressure are responsible for soda losing its carbonation, but how is it that the calibration alone of a soda fountain can result in dispensing an absolutely enormous head that takes tens of seconds to dissipate and almost no carbonation left in the soda?
17 replies and 1 images submitted. Click here to view.
>>
>>8383036
The carbonation can be dissolved in the solid drink or frothed up by poor pouring, pun intended. So the carbonation meant to stay in the drink floats away once the foam disappears.

http://www.artofmanliness.com/2014/03/17/how-to-properly-pour-beer/
>>
>>8383052
I figure there has to be at least a little more to it, as the issue appears correlated to neither how the cup is held nor the speed of the dispenser.
>>
>>8383060
I mean we are going off of anecdotal evidence only. So, my guessed knowing nothing about your experience is that 1) the way the cup was held, or 2) there was less carbonation to start with. But you can never know unless you test it yourself or find some type of research. Otherwise i stand by my explanation over what you figure or feel.

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I was wondering why can't smartphone chargers have jack connectors like in headphones. Following logic and my marginal knowledge of how electricity works, I have come up with an answer, but to be honest I don't know jack shit about physics nor technology really, so I wanted you guys to tell me if my answer is correct.

So, chargers can't have jack connectors because in order to charge a battery, you need a closed cirquit for AC electricity to flow. Jack connector doesn't have that, because it only has an input end. It works for headphones, because their...
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28 replies and 2 images submitted. Click here to view.
>>
>>8382946
>Jack connector doesn't have that, because it only has an input end
No it doesn't.
Jacks have two or more contacts. Those black bars you see are delimiting the three contacts in your picture.
>>
Well you certainly weren't kidding when you said you don't know anything about physics or electronics.
>>
>>8382946
Im not completely aware of the physics behind charging low power devices, but i know this:

1) Audio jack connectors are output only, and more importantly are not connected to the charging circuit. So, you cant charge using an audio cable, and even if you could the power would not make it to the battery but fry your motherboard

2) The bandwidth cap for audio cables is like 192 kBps whereas a simple usb 1.0 has a bandwitdh of 35 mBps. So not only can the usb input and output info, it is also roughly 200 times faster.

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why arent you doing award winning scientific research as a teen in a third world country ?

https://www.googlesciencefair.com/en/?utm_source=Google.com&utm_medium=desktophpp&utm_campaign=gsfawards16
13 replies and 4 images submitted. Click here to view.
>>
Because I don't live in a third world shit hole.
>>
Unlike third worlders, we don't get prizes for inventing the potato.
>>
>>8382741
>third world country
>see US flag
sounds about right

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does it work?

Can you guys produce any studies on that topic?

>inb4 /x/
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>>8382644
No
>>
>>8382647
care to explain?
>>
pls reply, want to know if my gf is right

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jesus i'm fucking stupid

okay i would LOVE help from anyone who could spare the time to help me with this

The beans must obtain 992 Joules of heat. The heat capacity is 4 J/(Celsuis x g) and the mass of the beans is 31 grams.

How much will the temp need to increase to cook the beans?

I'd also love if you could show any type of work.

understandable if you're busy, thank you for reading and THANK you for any help. it's beyond appreciated
11 replies and 1 images submitted. Click here to view.
>>
Q = mc(Tf-Ti)
>>
>>8382618
Well solve for C°: 991=4÷(C°*g).
I know you were being facetious, but do u now indeed see that u rly r stupid?
>>
>>8382650

bud, i'm well aware i'm stupid

that's why i'm asking for help.

even condescending help is appreciated

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If I have a GPA below 3.0 should I just end it?
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>>8382530
>GPA
What is this American meme I keep hearing about?
>>
>>8382530
Absolutely not. Solve whatever problem is keeping you from getting good grades.
>>
>>8382543
It's pretty much equivalent to the make and model of Mercedes u can afford in ur track-pants-suited country

What is the derivative of this function
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>>8382449
boner distribution
>>
Isn't that the Dirac Delta function? If it is, than it's 1.
>>
>>8382449
Heaviside function is the integral....

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Do you think it's possible to graduate in physics with an average IQ of 104, if you got the motivation?

I'm really interested in physics but not intelligent at all, however up spending a lot of time studying.
13 replies and 1 images submitted. Click here to view.
>>
hmm
>>
It has always seemed to me that grades equates to how hard you're willing to work rather than intelligence. Or maybe I'm just stupid lol! Do what you want OP.
>>
with additional 1-2 years and picking right professors i'd say 80% chance.

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Hi can some1 explain me how to resolve this with details, not only the answer plz ty(i want to know the m values):

m= y2-y1
____
x2-x1

x1=0
y1=0
x2=3⅓
y2=5/6
23 replies and 3 images submitted. Click here to view.
>>
5/6-0
____
3⅓-0

=m but how to get m plz help
>>
are you saying

m = (y^2 - y) / (x^2 - x)

? And they're asking you to plug in values for x and y?
>>
>>8382413
He's literally asking how to solve the slope formula.
This is obviously a troll.

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say we have a dehydrated man (no water for 1-2 days) in one of the following scenarios

A) on a glacier with snowstorm happening, ie it's very cold. Only source of "water" is eating snow

B) in the desert, the man is exposed to the sun and very hot. only source of water is boiling water

C) on the ocean. only source of water is saltwater

D) trapped in a dungeon. only source of water is his own urine

would the man in any of these scenarios benefit from consuming the water that is available to him? if not, why not?
are there exceptions?
14 replies and 4 images submitted. Click here to view.
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>>8382371
eating snow doesn't seem too bad
given a boiling water can cool down till it becomes consumable is fine too
saltwater and urine will kill the man, though
>>
>>8382376
>given a boiling water can cool down till it becomes consumable is fine too
well the idea is that the water is hot (far above human body temperature) at the point of consumption.

since the main point of needing water in a hot environment is regulating body temp down via evaporation (=sweating), I was wondering if that works with hot water, or if the water would just heat you up more
>>
>>8382371
>only source of water is boiling water
>implying the temperature of the desert exceeds 140F


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