Archived threads in /sci/ - Science & Math - 1519. page

>>8221357
rawr

https://www.youtube.com/watch?v=dZ5O4TRp9dk

t. bible belt "creationist"

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but there are NOT millions of either one
There are no early modern humans. They all have developed diffrent features, and also lost some
nor there are no chimps that are direct ancestors of us.

>>8221356
too busy doing your mum

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>>8221213
>I am a chemist trying to understand Physics

well there's your first problem right there

You can only measure with complete accuracy the total angular momentum and the projection of the angular momentum on a single axis. This is called a complete set of commuting observables.

It's debateable whether or not it's "actually spinning" but it has the algebra of angular momentum, so it's just called spin regardless. You can think of it as like left and right handed polarization.

>>8221213
>Red pill me on NMR
Rotating magnetic fields cause the dipole moment of the nucleus to flip back and force at a particular frequency. This causes it to radiate when it flips to a state that is parallel to an established (static) magnetic field. In MRI machines, this static field is given a gradient so that the radiation's energy (which varies with the field) can be analyzed and the nucleus that radiated it can be located. The emission rate is only high near a chosen resonance frequency, so usually this is set so only particular nuclei resonant. Perhaps oxygen, so you can see where water is in the body.

>Does nucleus really twist and roll while precessing or it is just a figure of speech?
No it doesn't do that. Take hydrogen for example: in the reference frame of the atom, the orbital angular momentum belongs to the electron. The electron has spin and so does the proton (and neutron). The word "spin" is in retrospect a horrible choice for this phenomenon, but it's much too late. The proton has a non-spatial degree of freedom that can be completely described by two quantum numbers: the total spin, and the projection of that spin on some given axis (as the other anon mentioned). The reason why that quantum state produces a real magnetic field is a complicated question and involves calculating things in QED. Just know that it does, just as how the parameter of electric charge creates a real electric field in the reference frame of the particle.

Nothing is actually spinning. The quantum state of the electron or proton interacts with the electromagnetic(photon) field in such a way that the electron exists with a permanent magnetic dipole of a constant strength. Hence in a strong external field, you can break the symmetry associated with the orientation of the dipole and create energy gaps. External influence on the dipole changes the quantum state (the projection of the spin) and causes it to "flip" back and forth as if the whole nucleon were somehow rotating.

>>8221056
The answer is whatever the answer is. Be sure to write it in math runes or your teacher wool mark you wrong.

>>8221082
0/10 shitpost

>>8221056
>"My Differential Equations Homework Challenge"

>>8220881
>just to learn how to fix a motherboard

See dem capacitors? One of them is bad and you need to desolder and resolder each of them to find the bad one.

>>8220881
If you ask me, the usual shops that do electronics repair know very little about the theory and they just study the in depth manuals that are made for literally any piece of technology.

Seriously, typical errors are usually documented by the manufacturer and all you need to know is what you need to replace to make it work again.

>>8220881
Practical Electronics for Inventors by Scherz and Monk

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The original is very outdated. They make an updated version but as a non med student your better off with online resources for A&P.
If you really want a textbook use Rohen or Netter.

>>8220757
Anatomy textbooks are a jewish scheme.
You're not gonna find anything novel that can't be found online.

>>8220774
I have the 15th Barnes & Nobel edition from 2010, I'm not sure how much of the science has been updated but I'm hoping it's legitimate because imo it's written in a much more interesting way than the more official modern med school textbooks

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>>8220710
>suggested
>may be possible
>thought to

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>>8220724
Are you a liberal brainlet?

http://www.nature.com/mp/journal/vaop/ncurrent/full/mp2016107a.html

A genome-wide polygenic score (GPS), derived from a 2013 genome-wide association study (N=127,000), explained 2% of the variance in total years of education (EduYears). In a follow-up study (N=329,000), a new EduYears GPS explains up to 4%. Here, we tested the association between this latest EduYears GPS and educational achievement scores at ages 7, 12 and 16 in an independent sample of 5825 UK individuals. We found that EduYears GPS explained greater amounts of variance in educational achievement over time, up to 9% at age 16, accounting for 15% of the heritable variance. This is the strongest GPS prediction to date for quantitative behavioral traits. Individuals in the highest and lowest GPS septiles differed by a whole school grade at age 16. Furthermore, EduYears GPS was associated with general cognitive ability (~3.5%) and family socioeconomic status (~7%). There was no evidence of an interaction between EduYears GPS and family socioeconomic status on educational achievement or on general cognitive ability. These results are a harbinger of future widespread use of GPS to predict genetic risk and resilience in the social and behavioral sciences.
These results are a harbinger of future widespread use of GPS to predict genetic risk and resilience in the social and behavioral sciences.

2%
4%
9%

LIBERALS ON SUICIDE WATCH

>>8220693
Watch the movie: Pontypool

https://www.youtube.com/watch?v=xQauJW09qRs

I, too, want my mind to be safe from being infected by memes. That's why I come to 4chan ...

>>8220693
And yet your entire framing of life seems relative to "everyone else". Making me doubt your self reliance and degree of seclusion.

>>8220646
>Nota
>B
You won. Kill yourself.

>>8220656
Hey it is one B man fucking hell nigga chill.

It was not even a math class, fucking language shit.

Lol not getting anything over an A in introductory courses. Kill yourself

It's poorly written and makes no mention of Jacob Barnette

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>no LaTeX

I don't read ANYTHING past the first line if I know it isn't LaTeX.

Where do you find these OP?

>>8220640
>Victor Mazariegos
it's a meme

Just get LASIK surgery u fgt. it gives you 20/20 eagle vision.

>>8220630
>I'm tired of being subhuman.
Glasses are associated with being Le Nerd these days, which makes you a cut above the rest. Embrace your awesomeness.

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>>8220634
lol no thx lad

Shoot a laser at one of the mirrors.

>>8220516
What I've never understood is whether or not sceptics deny all the moon landings or only the first one.

>>8220516

They didn't have the tech and it would have been far cheaper to just fake it

>>8220546

Prove the mirrors were placed in 1969

>>8220568

Only the 1st

but i can see the curve...

>>8220255
>>>/pol/

>>8220255

>Current year

>Still believing in flat earth

>>8220215
There is at least a 0.3 correlation. Another anon linked another study which indicated over a 0.8 correlation. Look at pictures of members from the Mega and Triple Nine society. They all have way larger heads than normal. Regarding forehead size this may be confused due to hair lines so is not the best determinate for cranial volume.

>>8220228
Continued: Have a high intelligence is present both from having a good mental mapping and a good cranial capacity. Since there is not too much deviance in brain mapping, aside from certain extremes of verbal intelligence (ie.: vocabulary), cranial capacity is a good measure of giving a rough estimate of one's intelligence. This is of course excluding outliers resulting from mental diseases or brain cell death via results from, say, drugs.

>>8220228
>>8220228
>>8220235
Really interesting.Is there something you can do to increase your brainsize if youre still in puberty/25(that was the age where brain is fully developed right)?

>>8220141
oh shit waddup

>>8220141
High quality b8

>>8220141
>dormant in Antarctica
I guess you can attribute all kinds of things to a place man has essentially never stepped foot on.