Hello.
Can anyone tell me please what this operator in the picture means? Much appreciated.
>>7785683
It's the symbol for union of sets.
>>7785690
I see. Thanks!
>>7785696
https://www.google.de/?gfe_rd=cr&ei=Sz2ZVr73LcOH8Qek2IrYBw&gws_rd=ssl#q=maths+what+is+the+big+u
please learn to google next time.
what's a tl;dr way to determine whether you need to use a t test, z test or chi squared test for a hypothesis test?
>>7785672
>SKEPTA
nah m8 but his bro tip top
>>7785672
Z test: you know population variance
T test: you only know sample variance
Chi square: categorical variables, i think
have any of you Americucks heard of the University of Warwick?
yeah, they make awesome bass guitars and is a really good jungler
>>7785634
economics aint no science
>>7785689
They don't even fucking teach high level maths on it look it up
why is there so little lectures about electrical machines on the internet?
What do you mean? There are lots of free lectures about electrical engineering.
>>7785646
yes but im talking about machines
>>7785655
That's what engineering is. Making machines.
Could you give an example of what y you're talking about?
>keked by a small water bubble inside the helmet
>entire space walk called off
>helmet probably made in china
So is it unanimously agreed by the council of /sci/ that humanity is forever stuck here on this shitty planet?
they replaced the module 2 hours before they came in
literally no problem
have a nice day
Hey /sci/
i am looking for an overview about the formation of liquid crystals. Especially Onsager, Flory-Ronca and Maier-Saupe theory. Does someone have some literature maybe a review about it? Thanks
>>7785614
use web of science you dumb faggot
why do carbon based organisms breathe oxygen when there is a larger abundance of nitrogen in the atmosphere , surely it would have been a better evolutionary trait to breath nitrogen?
Oxygen is more apt at accepting electrons during metabolism, and creating a waste product of water.
>>7785554
Nitrogen is inert
Ain't no fucking with that crazy low energy bond order of 3 dinitrogen senpai. Also oxygen more electronegative easier to reduce, other reasons too but far too much to explain
Cambridge results came back a few days ago, and the Oxford ones have been back for about a month.
How did you and your friends fare?
What do you think was the crucial thing you did that led to your success/failure?
>>7785548
Oxford can eat my shit
Go for Harvard
>>7785579
Oxford and Cambridge are both many times cheaper than Harvard and about the same level of reputation.
>>7785585
>not factoring in cost of living there
>not factoring currency coversion, fucking pounds man
Harvard is cheaper, and more reputable, it's gonna be 400k before you know it there.
Book ten. Proposition 22.
Why doesn't the proposition state that the rational straight lines are commensurable in square? Aren't they? I mean, you are dealing with a medial area, they necessarily have to be.
Geometry can't even be proved, why bother.
- The World as Will, Martin Luther King
>>7785553
I wasn't aware he was qualified to make such statements.
>>7785560
jesus fuckin christ man
There's something It's been bothering me.
How many of you faggots really care about learning more about the universe and hopefully at the end of your life discover the real truth inside it.
Most of you are STEM but there's so many shitpost against entire fields of knowledge you really don't know anything because it's not your major.
But, how many of you faggots do read about other fields of knowledge simply because you love learning.
I'm a lit major but I read also basic math and physics books to understand them.
My goal is to major in literature and minor in philosophy, but this doesn't mean I won't be reading about STEM topics.
I just wonder how many of you do also study on your leisure time humanities topics, like art or literature.
I just feel that specializing in one field and disregarding others, while calling them brainlets is pretty ironic.
Hell, I do also read stuff like teology and find those books about ocult arts and magic pretty interesting.
This doesn't mean at some later point I wont be watching some feyman lecture.
Dunno, just my two cents.
oh wow. i'm not even sure if i should reply with a so edgy, fedora or ayylmao meme
>>7785532
Please read the "Theory of Scientific Revolutions" and realize there is no "grand truth" that we are approaching. But what we have is better than ignorance/lies (i.e humanities)
>>7785532
For most part of my life I've been on a journey to seek truth. I turned to science. I spent a lot of time informing myself about all the fringe theories, the furthest stuff out there. Now, in my eyes it seems impossible to grasp truth with science. I then turned to philosophy to seek knowledge about the universe, the self, consciousness. Again, there are no answers here either. Right now, as ridiculous as it sounds I'm taking a spiritual way and it actually feels closer to the truth than anything else.
Spiritual doesn't mean bullshit mystical shit here. It doesn't mean I believe in karma or whatever. It just means I take a long deep look into myself, question myself and everything I know and try to come to a conclusion this way.
Anybody got an idea why male voices go up again when in grandpa age?
>>7785531
Decrease is testosterone hormone production?
>>7785531
I'd say drop in testosterone production?
If you look closely, you can suspect the male and female curves are going to the same limit, which would be a "genderless" limit.
testosterone help you grow a longer pair of chords at puberty, it has nothing to do with your voice's pitch afterwards.
retard here
what for serve the gravity waves?
Could you repeat the question?
Hold your horses fuckface. They aren't even confirmed yet.
>>7785522
The might confirm general relativity, which would be awesome.
>Gravitational Waves
what would this discovery imply? that chikung type energy work is true? that you can manage discrete amounts of energy at distance? whats all the fuss about really?
>>7785483
>what would this discovery imply?
it would confirm general relativity. groundbreaking for sure but it's not like we haven't already got a shitton of experimental tests for GR.
>>7785487
How can you even detect something like gravitational wave ? Sounds like bullshit
>tfw I read some faggot here claiming that the physical peak (mental and physical) of females is 25 years old while males is between (can't remember) 30-35 years old
can someone comfirm this?
I would like some good cientific citation or paper I can read and not dating advice BS.
The only thing I found was that females tend to find the most appealing males between 5-10 years older than her on average while males find the most appealing girls bewteeen 15-25 years old.
Does this mean a virgin beta that is 25 have enought time to change it's mentality and be an alpha chad at it's physical and mental peak to slay god tier pussy from legal lolis (we can fuck 14 years old legaly here in taco land) to MILFS, right?
I dunno, but I feel females tend to be impressed not because I'm hot (average brown manlet, not fat) but because I can usually talk with confidence about lot of stuff (basic pleb tier culture).
It's all about daddy issues and mommy issues ;)
>>7785457
When a picture does not expand I immediately assume that the person posting it must be retarded.
>>7785516
A good heuristic.
What's the difference between a pulsar and a black hole?
>>7785450
>pulsar
Not a singularity.
>>7785450
one emits something, the other doesn't.
>>7785450
>rotating neutron star that emits a beam of electromagnetic radiation.
>neutron star
look up P-P chain and CNO cycle, the lifetime and form of a star depend on its mass.
Normally a star is prevented from compressing by its own gravity as long as the nuclear fission is going, the star is so boiled that gravity doesnt really compress the star itself, but if the fission runs long enough, such that it comes closer to iron which is stable. The star doesnt "boil" anymore and compress itself by its own gravity.
If it compress to the point where even electrons are pressed inside the nuclei, the proton and electron form neutron, meaning the whole star is neutron star.
I am no expert but i know black hole can have different size, i am not sure about such property for black hole but a neutron star doesnt necessarily have mass large enough for light to not escape.
As for radiation, both rotating black hole and neutron star emit radiation like pic related.
