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Archived threads in /sci/ - Science & Math - 106. page
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Next year i'm going to university and I'm pretty worried about my knowledge in Physics. At school we don't study it that much , so i thaught that I could start study something on my own. They suggested me this book. Is it good for "amateurs"? Also I'd need a pdf(or ebook) version of this book , can anyone link me one?
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noone?
>>
>>8436321
/sci/ is slow
here's a link to purcell's EM as a pdf
http://bookzz.org/book/2045181/d34985
the djvu files tend to be smaller, so you might want to get a djvu reader
>>
quite usefull

Let's say I have this number:
>0.999... + 0.5
0.999... is equal to 1, so the sum is for all intents and purposes 1.5

If I were to round this number, would I round it up (to 2) or down (to 1)?

Technically, it's 1.499..., so it should be rounded down (as with all numbers followed by 4), but because 0.999... = 1, my number is 1.5 and should be rounded up.

Up or down? Which one is it?
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>>8436201
mathematics CANNOT answer this
it is proof of its INCONSISTENCY
>>
up.

hope this helped.
>>
Occams razor, unless you're doing some weird stats thing where the rules are-clear cut (aka ALWAYS round down in this case to prevent personal interpretation and inconsistances in the data akin to significant figures)

Its obviously "closer" to 1.5. So, up.

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I did a ton of research and there is no cure for procrastination
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The cure is just fucking do it.

No really, it's that simple.
>>
>>8436148
The cure is to uninstall 4chan.
>>
>>8436148
You don't beat procrastination. Some people just accomplish more in lesser time. We call them geniuses. You're not.

I'll start with some piss easy vectors shit...

Show that
[eqn] r=(2,1,0) + λ(-1,2,4) [/eqn]

And

[eqn] r=(-1,3,2) + μ(2,-5,3) [/eqn]

are perpendicular
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Someone... Anyone?
>>
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>Reminder: /sci/ is for discussing topics pertaining to science and mathematics, not for helping you with your homework or helping you figure out your career path.

>not for helping you with your homework
>>
>>8436091
Just a crumb of help. I am a mere spec seeking just a few bytes online to guide me in the most miniscule way.

Please offer me your help amidst the countless math you deal with daily. I will be beyond grateful

Is there a scientific way to help me stop drinking? I've been hospitalized many times for alcohol related issues and got put in a mental ward twice. I can stop for a couple days but i always end up drinking again. Iv'e been to meetings but that made me want to drink more. Is there some scientific mental hack i can use?
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>>8436055
antabuse?
https://en.wikipedia.org/wiki/Disulfiram
of course you can simply refuse to take the pills
>>
>>8436055
Antabus
>>
>>8436055
get a hobby. and another idea is hypnosis but i have no idea if it would work
>>8436066
>>8436069
this just will just make a 10x worse hangover has all sorts of side effects and can actually be dangerous.

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I don't get how if we know p≡1 mod 3 or p≡ 2 mod 3 it implies that 2p+1 ≡ 0 mod 3 and 4p+1 ≡ 0 mod 3 as well?
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In mod 3, multiplying both sides of p ≡ 1 by 2 gives 2p ≡ 2 ≡ -1. Similarly, multiplying both sides of p ≡ 2 by 4 gives 4p ≡ 8 ≡ -1.
>>
>>8436037
There are 2 options, check them
option 1: p%3 = 1
2*1+1=3=0
4*1+1=5 =2

option 2: p%3 = 2

2*2+1=5 = 2
4*2+1=9 = 0
>>
>>8436043
>multiplying both sides of p ≡ 1 by 2 gives 2p ≡ 2 ≡ -1

wut?? -1??

>>8436057
but p > 3 so why is it 2*"1" + 1? similarly 4*"1" + 1?

youre using P = 1 in these examples I dont get it

Hello, I can't move my right foot upwards and can't move my big toe over the one next to it anymore. It feels basically like my foot is partially paralized. It will not move up at all

Can someone explain this?
I might have made my foot numb too long by sitting a certain way so I could have cut off the blood flow.
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Do u have potassium defieciency
>>
>>8436000

Are you a fat piece of inactive shit?
>>
the fact that you cant move your foot up would suggest damage of the deep fibular nerve, probably through compression

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Why is most of science research published today not repeatable?
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because "muh grants" and "muh publish or perish"
>>
>>8435914
Shitty reviewers who don't reject these papers
>>
>>8435918
b-b-but pop science said we'll have a Martian colony, fusion and a cure to cancer in 10 years

b-b-but

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What are the most useful math courses you can take beyond the basics such as calculus and linear algebra?
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>>8435896
real analysis.

or rational trig, if you hated highschool trig
>>
Differential Eqs and Statistics
>>
>>8435896
Complex analysis.

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Will mathematics share the fate of poetry and philosophy? Since large parts of it are fancy ways of expressing things.
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What do you mean by share fate?
>>
>>8435950

become obsolete, redundant and unwelcome

probably not all math though
>>
>>8436039
Philosophy is still very much alive with plenty of new discoveries every year.

Tell me /sci/, if consciousness and intelligence are produced by the brain, then how the FUCK does this guy have a degree in mathematics when 90% or more of his brain is missing?

http://rifters.com/real/articles/Oliveira-et-al-2012-RevisitingHydrocephalus.pdf
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only use 10% of our brains is just a meme they said.
>>
>>8435775
This man's brain is not 90 percent missing, it's mostly compression by fluids that make it look like that. Also it's been known that other parts of the brain have been known to take over functions of missing parts.
>>
>>8435828
No, actually, it isn't compressed, it has been replaced by fluids. There is some compression going on but the cerebral mass is actually ~90% less than that of a normal person. I didn't pull that number out of my ass, there have been many studies done on this guy.

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What if High school teachers were required to publish?

would that help western education?
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>>8435758
would set the bar too high, no one would be teachers

also what kind of groundbreaking research could you do with the equipment in a high school lab
>>
>>8435763
>would set the bar too high, no one would be teachers


What if the school was required to publish as a collective in a few subjects? that way specific teachers don't have a huge burden on themselves. That way you'll get intellectuals in the classroom to teach the youth.

>also what kind of groundbreaking research could you do with the equipment in a high school lab
you'd of course need to provide better equipment and such,...
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>>8435758
the #1 function of school teachers (below uni level) is being a day-care attendant
that's really, really, really, really, REALLY different than publishing research

like we might as well require the janitors to be amazing at painting in water color. those skill sets are about as related as teaching high school and publishing research

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Choice 1) Fully funded undergrad program from University ranked no higher than top 50 in your field (includes modest living expenses)

Choice 2) Undergrad program at #1 University in your field but graduate with $250,000 of debt
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>>8435517
Student debt or real debt?
>>
>>8435517
Critical thinking time here. What is education and what is your $ buying? At its' core what differentiates Unies (besides cost)? Consider the following to make a decision:

- Facilities: access to cutting edge labs and facilities; but is this really necessary?
- Talent: access to really smart professors; but despite their smartness how good are they at communicating/mentoring?
- Practical Experience: research projects; useful if you want to be Uni researcher after graduation but otherwise? Also...
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>>8435737
/thread

Thanks for the post

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The sole purpose of my studying mathematics is so that I may one day find a result that will completely rip apart the entirety of the mathematical enterprise. Yes, I am a sadist. The idea of seeing mathematicians around the world in despair because they realize they wasted their entire lives studying an ultimately pointless field brings me pleasure.

Which area of mathematics should I focus on my chances of achieving this? What has the most potential to break mathematics?
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cool story bro
>>
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>>8435483
>>
there are no revolutions in math
do physics

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>>8435356
no, get a job

the singularity is an IFLS meme
>>
>>8435356

> Anyone else completely given up on life

Yes.

>and dedicated to the singularity?

No.
>>
>>8435361
What makes you get out of bed in the morning then? I 100% would off myself without the hope that the singularity gives me

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>get A+ on first midterm
>professor starts acting noticeably kinder to me
>says good morning to me every class
>looks at me when she asks the class a question
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>>8435346
>implying A+ is good enough to get professors attention

100/100 or GTFO for prof respect
>>
>get 100 on first mid term
>feels good man
>fucked up on second midterm, might get an 80 something, know I fucked up on some parts of the test

Feels bad man
>>
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>>8435369
it was a sign error

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Which major is the Chad of STEM?
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>>8435345
Medicine
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>>8435345
>biology, chemistry, biochemistry or any combination of

girls flock to this chad discipline
>>
>>8435349
Specifically, surgery.

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Kind of a weird question, but here it goes: how do I go about testing my garden soil for drugs?
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Put it in a pipe. Smoke it and see if you go to Narnia
>>
>>8435311
negatory, I'd be testing for non-smokables anyway.
>>
>>8435318
If you can't smoke it then it technically isn't a drug.

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Hey, currently a maritime academy cadet, former physics major 3 years ago. I'm applying for the Navy's NUPOC Program (Nuclear Propulsion Officer Candidate).

As such, I need to brush up on my physics and calculus before my interview and examination.

What are you recommendations for calculus and physics textbooks? I need a calculus book that covers integral and differential calculus, and I need a physics book that covers Newtonian mechanics, electromagnetism, and a few other basic concepts like that, but it of course has to be calculus based, not algebra...
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>>8435246
Hate the way Stewart covers integral calc.

calc -> Salas\Hille\ Etgen?
basic physics -> Tipler\Mosca?
dynamics -> Beer or Bedford\Fowler


The calc book is geared towards engineers. Skips over a lot of esotera, which is nice if you're trying to review alot of material quickly. The physics book covers electromagnetics pretty well, and formulas for common applications are highlighted.

If you really want to pwn dynamics, use Beer. It's denser than a black hole, but worth...
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>>8435282
Thank you, this is very helpful. If I recall correctly, dynamics isn't covered very extensively in the interviews and examinations. 70% of it is pure calculus and physics up to and including electromagnetism, and then the rest is a mixture of chemistry, dynamics, etc.

I think the purpose of the examination is mostly just to see that you're not a retard and that you'll be able to pass Nuclear Power School.
>>
>>8435246
Careful with asking recommendations on /sci/ as these retards only recommend meme books aimed at math majors that they've never even got halfway through. These books also usually don't give you any practical applications (ex: not reading a normal calculus book and instead reading analysis book you'll fail even at AP calculus)

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What is the farthest/narrowest laser focus in use today?
Is there some hard limit on the minimal angle of spread from a laser?
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What do you mean by farthest laser focus exactly?
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>>8435248
Well I use a laser against a wall I get a dot about the same size as the lens. But if I aim at a building 1 mile away, the dot on the building is about the size of a car. Maybe I haz shitty laser. But in theory I expect a good laser to have a dot the same size as the lens even if pointing at the moon.
>>
Lasers are diffraction limited, meaning that the sharpest point they can be focused to is limited by the size of the hole the light comes out through, and by the wavelength of the light. If you point a very good laser on the moon, the spot will still be several hundred square kilometers.

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let's see if you can solve this, I'll tell you if you are correct or not
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you know, i can see it a bit too well, maybe you should blur it a bit more
>>
>>8435249
I can see it just fine
>>
I can see it, but it took work.

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Obligatory consciousness thread.

I'm for idealism. The physical is a construct of the mind.
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>>8435168

Then why does every single piece of evidence we have point to reported states of consciousness being causally downstream from the physical brain rather than upstream? You ingest chemicals that interact with the brain, your consciousness changes in radical and relatively predictable / repeatable ways. You get brain damage from physical injury, your consciousness changes or shuts down. You have a stroke, your consciousness changes or shuts down, etc. A lot of evidence is there for the mind being a production of the brain.
>>
>>8435172
If you fuck with an antenna, the signal might not come in very clear.
>>
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>>8435168
nuh-uh

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Would it even be psychologically possible to feel happy doing a hard, repetetive task with no reward or meaning?
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I know some people who are married and seem happy
>>
>>8435145
How much does it pay?
>>
>>8435192
No reward

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Alright, so my second semester of uni is coming up. Calculus 3 was a breeze, and my advisor told me to take Linear Algebra next.

When I asked her if I'd be able to instead take Differential Equations first, she flipped shit and told me that that isn't even possible.

The fuck? Is it?
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>>8435134
>not doing Calc 3 and Matrix Algebra at the same time

You fucked up nigger.

>The fuck? Is it?

Some schools merge Matrix Algebra into ODEs and others don't. If you're desperate then you could ask do them at the same time and study a bit ahead to eigenvectors.
>>
It is weird that she said you can't differential equations. A lot of people at my uni take that after Calc III.
>>
>>8435134
linear algebra is a stupidly powerful tool for solving DEs, so I don't know why you would want to learn DE without it

OTOH, my sophomore DE class didn't have a single formal LA-based approach and was instead focused on solving stupidly easy things in the quickest way possible without learning any of the theory, so, it really didn't matter whether or not we had taken LA.

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When did you realize you were a retard?

I just recently figured out i could avoid having to clean up piss from the toilet seat if i just raise it up before pissing.

Would it be scientifically possible for me to beat by head with a pan till i become intelligent?
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>>
You can also avoid cleaning it up by not cleaning it up.
>>
>>8435110
That's what I usually do, kek.
Why bother when somebody can do it for you?
>>
>>8435120
Or why not just have the piss there?

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Is DXM induced insomnia a thing?

After two experiences of Plateau Sigma in a row I can't seem to sleep at all.

The first time I had been awake for 40 or so hours, but now I can't even count. I know that I'm fine up until around eight days as long as I eat and I'm careful with how I walk but I'm just wondering what's the reasoning behind all of this?

At least if someone could point me in the right direction that would be helpful.
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>>8435082
Idk wtf plateau sigma is (I go by 1-4) but in my own experience I haven't been able to find any real research as to its recreational effects on humans. Pretty much everything is internet druggies getting high and speculating or it's low dose pharma settings. Overall I'd just say steer clear of high doses cause frankly nigga nobody really knows what the fuck can happen with the pharmacokinetics of 64 robitussin capsules in the gut
>>
>>8435090
Forgot to answer your question:
Essentially any number of changes to the sleep cycle can happen, modern medicine is pretty primitive (when it comes to live-action brain shit outside of a scanning machine) so cross your fingers and your body will likely make it out of this one alive
Unless ur rekt lol
>>
>>8435082
Probably because if you've sigma-dosed you've been doing drugs for days on end.

Also be careful as the other guy says. We really don't know the long term impact of DXM. There was the Olney lesion thing, and the refutation of that study, whatever. This just shows the results as inconclusive. Doing Sigma doses is undeniably fucking up your brain, at least in the mid-term, so make sure you get plenty of rest and recovery.

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After taking AP Chemistry, I'm considering a double major in Chemistry and Psychology. Can any chem majors on /sci/ share their experiences with their classes/difficulty?
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>>8435058
First two years for the standard track are general "inorganic", and then organic. With maybe an analytical course thrown in.

If you are still taking, or passed AP chem, essentially the first year will be a repeat of this. It will be EZ mode, as it should be.

Organic is very different. The lecture exams are extremely abstract, involving only theory, no math in my experience. The labs are meh cuz its hard to get accurate results in micro experimentation with shitty equipment. Overall not bad...
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>>8435058

A chemistry major is:

>Year 1:
Calculus 1&2
Gen Chem 1&2 + Lab <or AP Chem>
Analytical Chem

>Year 2:
Calculus 3 and Linear Algebra
Orgo 1&2 + Labs
Physics for Premeds 1&2

>Year 3:
Inorganic 1&2
Pchem 1&2 + Lab
Instrumental Analysis

>Year 4:
<fucking nothing>

The hardest part is fucking up a lab...
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>>
>>8435109
>acquiring autism
Could you elaborate?

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What causes the wave function to collapse?
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no such thing
>>
>>8435037
u wot m8

https://en.wikipedia.org/wiki/Wave_function_collapse
>>
>>8435024
High number of degrees of freedom interacting with small number of degrees of freedom

>>8435037
Hasn't studied QM

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Why do electrons only absorb one specific frequency of light? Do the other one's just pass-through?
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no it reflects it - giving it the color you see
>>
>>8435031
What happens if another light source comes in contact?
>>
>>8435012
photons of any energy can interact with an electron
one way they interact is by getting absorbed/emitted in discrete, quantized amounts. if a photon has more energy than is necessary to do this, it will still do it, and the extra energy will be conserved as kinetic energy (i.e. conservation of momentum)
if a photon doesn't have enough energy to bump the electron up to the next level, it can still transfer it's energy as kinetic energy (again, conservation of momentum)

Well, /sci/?

And don't be cunty about it, either. See how well you can do.

http://www.sporcle.com/games/g/elements
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Game Paused 03:34 Remaining
60/118

doubt I can do better then that. I think it's pretty good considering that I'm studying engineering.
>>
>>8434899

Thank you for an honest reply, and thanks for playing!

I used to memorize them back in hs so re-learning the table wasn't difficult. Part of the appeal is that they're about to officially re-name the last four elements (the quiz accepts these new names as alternate entries, atm).

I think it's very interesting that copper, silver and gold are all in the same group, /in that order/. Copper is also the principal constituent of bronze; I was wondering if any chemists could say a bit more about whatever other commonalities these well-known transition metals have with one another - I assume they're all relatively soft metals. The modern convention of bronze/silver/gold medals in the Olympics got started in the very early 20th c., this seems to have come after the recognition of the metals being in the same group c. 1871 by Mendelev, in an amended table (per wiki).

Did any historical understandings of gold as "best", silver as "second-best" and bronze or similar as "third best" precede Mendelev's arrangement?
>>
>>8434852
47/110

I'm a chemist.


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