Archived threads in /sci/ - Science & Math - 323. page
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I wanted to test electrolysis in water at home so I connected a 9V battery into a little test tube of filtered tap water and partially stuck the cap on it so the wires would stay in.
Now I know I'm supposed to get hydrogen and oxygen gas which is happening but after letting it sit a while, there has been a light blue liquid accumulating at the bottom (as seen in the picture I took). I've also been worried that I won't handle the tube correctly and the hydrogen gas will react with the air (boom).
If anyone could explain what the light blue liquid...
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>>7925007
Fluoride?
>>7925007
Most likely you made Cu(OH)2 from copper from wires and water
>>7925029
Yeah, I'm going to say that's about right.
Does anyone have anything to add on how to saftley extract the hydrogen?
I believe that if we were able to peer into the 4th dimension, our 4th dimension, we could see a sort of infinite, flat wall consisting entirely of "gears". There is a flat dimension of "machinery" operating on all the matter in our universe, explaining the expansion of space, the nature of quantum mechanics, and the problem of free-will/causality.
Elementary particles have a 4-dimensional aspect. I don't know this to be true, however I have deduced it intuitively. As Carl Segan notably explained, a 3D object embedded in two dimensions would...
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/sci/ really is a shits how is this being overlooked
SPSS or Excel with stats add-ins?
>>7924338
this is pretty gud.
they women = problems one is good too.
>using either of those
use R
>>7924356
dis
So I'm doing this project on electromagnetic waves & radiation in light, but I don't know what experiment I could do that wouldn't cost me a math PhD pay grade.
kek r u in high school
>>7924053
I don't live in America.
>>7924049
double slit experiment.
literally requires cardboard, needle and laser.
So, what exactly causes those? A lot of people say it's due to zinc deficiency, but I've read somewhere that it was rather provoked by small traumas to the nails and such. Who should I believe?
>>7923614
Causes what? That scuff mark looks like you took a knife and scratch off a thin surface layer.
>>7923640
Yeah, sorry, I should've taken a better pic. (Hopefully this one is clear enough)
>>7923614
I am pretty sure that is what happens when HIV is becoming full blown AIDS.
not even asking anyone to solve anything, just wondering how well y'all think you would do.
http://rpistudygroup.org/MATH%20-%20Mathematics/MATH%204090%20Foundations%20of%20Analysis/Exams/Exam_1_SampleNew.pdf
>>7923191
lol that is not math
that is letters and fancy symbols
>>7923191
100% in 20 to 30 minutes depending on how fast I write.
pic related would be me whilst taking the test
Can someone explain to me how the things in the red box are achieved?
I never got how to foil polynomials to the power of three. And if you guys could also tell me what to search up on YouTube?
Thanks
>>7922697
if you don't know the "pattern" you need to follow, just do the polynomial to the power of two and multiply it by the term again.
(x+t)^2 * (x+t)
>>7922704
I end up with x^3 + x^2t + 4x + 4t ..
>>7922697
For any power higher than 3 you'd use this triangle to find the coeficcents of the terms.
For example:
(a+b)^n = (nC0)a^n + (nC1)a^(n-1)b.....+(nCn)b^n
The C's are the reffering to the nCr function that is probably on your calculator but also reffers back to this magical triangle where the n is the row and the r is the position (both starting with 0) e.g: 7C1 = 7
(This is called the binomial expansion btw should you want to do some further reading)
ITT: Beautiful equations
>>7922610
What does it mean? I guess Aut(G) implies G is some algebraic structure, probably a group. and M might be a moduli space.
Thats my best guess.
>>7922670
Automorphism group.
Self isomorphisms, they all have inverses. So Aut(g) is always a group no matter what object you are working with. For example G could be a set, a tolopogical space, a differential structure, a group, ring, feild or vector space.
The cool thing is you can look at a automorphism group and get some nice group theory out of anything you can define an isomorphism for.
>>7922670
Aut(G) is the autism group.
Pi day is coming soon, and that makes me wonder why this number has become such an overused meme? There are so many relevant irrational numbers out there. Why does nobody talk about Phi or root 2, both of which have far more utility for me than Pi ever did?
>>7922475
>both of which have far more utility for me than Pi ever did?
Because most people are not you...
>>7922494
Because it is very basic, and everyone learns it in school.
>>7922475
it's the first fundamental mathematical constant that people learn in school, and most people don't know any others besides pi
Uni thread. We're did/ do you go and what do you study
durham, economics
>>7922318
Durham, Physics. ez life
>>7922320
Chemistry at Oxford. What you doing on sci m8?
So what did they teach you in high school?
This is me:
Mathematical logic
Set theory
Number theory
Algebra
2d geometry
3d geometry
Vectors
Trigonometry
Cartesian geometry
Combinatorics
Graphs
Functions
Series
Single variable function analysis
Statistics, Probability
>Pic related is the problem books backside
All that + some calculus
How about functions, integrals and limits?
Trigonometry first year and then three years of calculus.
The rest we had in middle school and elementary school except for statistics which I remember choosing not to take but I don't remember when.
Do Casio calculators still do this? What about other calculators?
I mean newer models of Casio calculators.
Just submit to the continuation of TI's monopoly.
>>7921940
It's just the folly of PEMDAS, I guess multiplication technically comes before division in the acronym so fuck it, the top calc is right
hey /sci/
fill in the operators + - x or / rounding is not allowed..
8 ? 8 ? (5 ? 3) = 4
>>7921791
8 - 8 / (5-3) =
8 - 8/2 =
8-4 =
4
can anyone help me solve this i am having anxiety over this
7x-3y+2z=0
4x-4y-z=2
5x+2y+3z=1
if you can show work that would be great
8 - 8 / (5 - 3) = 4
Is there any relationship between a color's complementary color and the complement of its RGB hex code?
For example:
BLUE's complementary color is ORANGE
~ 0x0000FF = 0xFFFF00
>>7921147
15-n=c
N (digit of the original color)
C (digit of the complementary color)
>>7921155
Yes, I know how to take the complement of a color code, but BLUE's complement in hex is YELLOW and BLUE's complementary color on the color wheel is ORANGE.
>>7921160
You're using RYB complementary colors but trying to understand what that means in hex color codes which are RGB. You're using two incompatible color systems
My friend seems to believe so but I differ greatly on this
Why do non-native English speakers always make such terrible posts? I'm not that big on racial superiority but there's only so many shitposts in broken English you can read before you start drawing certain conclusions.
>>7920968
My bad I've had a long day and forgot that I typed two of the same word sorry about that.
>>7920967
Not only did you type the wrong word,
you typed it twice.
Well, anyway
no.
