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Does /sci/ recommend brainhacks that can make me study?
I can never study, and if I do I can't keep on studying for more than a moment, so I've been considering taking modafinil.
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get off 4chan
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>>7729038
Close your laptop, open a book, don't look away for 5 minutes
There, you've entered study mode
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>>7729044
It literally doesn't work
I once smashed my router, phone and laptop and still couldn't study
It was possible to pass without studying all the way through highschool, but Uni is too big to bite, desu.
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http://www.technologyreview.com/news/544421/googles-quantum-dream-machine/
What is /sci/ consensus? Breakthrough or impending failure?
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>>7728944
>and cooled the apparatus to a hundredth of a degree Celsius above absolute zero.
facepalm.jpg
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>>7729132
Are you sperging out over the unit? It's not wrong.
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>>7728944
It's really pretty
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What's wrong with this /sci/? Why I am getting the last result 'half' wrong?
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>>7728812
well to begin with you're assuming that P = 2pir = one anus
it's actually two ani
insert that into ur equation f a m
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>>7728818
>it's actually two ani
what? isn't the perimeter of a circle 2·pi·r ?
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>>7728812
Think shells
V= ∫[0,R] 4πr^2 = 4/3πR^3
For disks
V=∫ π √[R^2-r^2]^2 dr = π ∫ R^2-r^2 dr = 2π[R^3-R^3/3]=4/3πR^3
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Hello /sci/ what are some good math/science related youtube channels? Also how much of pic related or numberphile or other pop sci channels is truth and how much is garbage?
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Stop reposting this.
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Used to watch "hi michael, vsauce here" some years ago but felt it got too theoretical.
Like that last video with the cake experiment.
>cut the cake in half many times
>lol infinite surface area and still the same mass
There is a point where you can't cut the shit more due to basic material science, triggers my autistic ass.
The channel is for thought experiments, not "real" science.
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>>7728713
>how much of pic related or numberphile or other pop sci channels is truth and how much is garbage?
Well you fucking disgusting lazy faggot why don't you go fucking check their sources that they fucking list on their fucking videos and see for yourself how fucking reliable it is you fucking fuck piece of fuck lazy piece of fucking shit.
Seriously, people. Why do some of you think that you can come here and have us do your leg work? THE SOURCES ARE OUT THERE! READ THEM! COMPARE THEM TO OTHER STUDIES! This is 2015, the age of information for fuck's sake.
All right /sci/ I have a question for you. I would like to learn as much as possible about math to better my knowledge. The highest level of math I have ever gotten to was about halfway through Pre-Calculus. Where could I learn higher level math online (for free preferably)
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>>7728659
MIT OCW calculus (18.01), vector calculus (18.02), differential equations (18.03)
Harvard Extension videos on Abstract Algebra I using Artin's text
gen.lib.rus.ec
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You sound like me a few years ago. EXACTLY like me. Wanting to improve your knowledge is awesome and valiant, especially if it goes toward something you have interest in. But I can't shake the feeling that you don't have anything to connect this mathematical knowledge to (programming, physics problems, electronically engineering) and you'll probably end up giving up your study a few weeks in.
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learning about higher math will not 'better' your knowledge. you'll be trapped in a place where you will prove results and theorems about more and more abstract ideas until you realize you don't know how to connect to a single person without thinking they're retarded, when in reality it is you who are the stifled one with no knowledge about the world around you or how it works. good luck
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Syllabus for my linear algebra class next semester. What the fuck is this shit? Why can't I just learn in peace?
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I don't know man. I don't know.
I'm sorry that "education efficiency experts" have made teachers do this.
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>>7728518
>Introductory Linear Algebra
>aka Matrix Algebra
Because you're taking a pleb tier class
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I hate this too, especially team projects, like an assignment for 2 people. I don't like to depend on some lazy fuck.
Could someone explain me how to go from blue to red? I've tried to do the triple integral integrating first for dphi and dalpha from 0 to 2phi and to 0 to phi? But I end up getting 2·phi^2 instead of 4phi
please help
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OP here, I actually forgot the sin(o) when I integrated, I did it and I got 0, now I'm totally lost
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>>7728460
I have no idea why you're talking about phi and alpha instead of phi and theta. But you integrate phi from 0 to 2pi and theta from 0 to pi.
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>>7728479
It's spherical coordinates, no? Doesn't the phi go from 0 to pi and theta (or alpha?) from 0 to 2 pi?
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If you had a tonne of water dumped on your head, would you die?
Or does the weight kinda disperse across your body because it's liquid?
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>>7728387
This is the same as you hitting a tonne of water with your head, so think diving into a pool. Obviously it depends on the night you drop from
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>>7728395
This. If you drop it on the first night, you'll probably just get wet and cold. However, if you wait two months to drop it, this would be the equivalent of smashing head first into a block of concrete at ~60 mph.
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>>7728401
Kek.
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> Recently started my first semester of graduate school at Berkeley
> TAing an upper division linear algebra course
> mfw I grade homework / exams
What gives? I thought Berkeley kids were supposed to be smart, but most of them don't seem to have a solid grasp of fundamental logical reasoning, let alone the material being covered. I TA a class of about 20 students and only 1 of them seems to consistently have a grasp of the material.
I admit the course and the exams are especially challenging. More challenging than my undergrad classes, but I still feel like I should see better. Is proper mathematical thinking just too much for most people to handle?
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>>7728366
>TA
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>>7728376
What's your point?
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>>7728366
>goes to Berkeley
>must be smart
For someone in math you have terrible logic
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Hey /sci/, if you build a tower of hamburgers from Earth to Mars at closest approach, how much weight would all of the other hamburgers push down on the one on the surface of the Earth with?
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it depends. is it in europe. probably several gigatons.
in america? quarterpound with cheese.
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>>7728338
Distance from Earth to Mars in millimeters:
225,000,000,000,000
Height of one average 300g burger in millimeters:
100
Weight of one average burger granted it is only bun and burger ~330g
Amount of burgers you could tower on top of eachother: 225,000,000,000,000/100 =
2,250,000,000,000 burgers
Weight of the sum of all burgers minus the one on earth: 2,250,000,000,000*330 - 1 =
742,499,999,999,999 grams.
Translate to weight:
742,499,999,999,999 / g = 742,499,999,999,999 / 9.81 =
75,688,073,390,000 Newtons is the weight they would all put on the first burger given that Mars doesn't affect the burgers near him such as for instance the last burger, etc. If Mars does come into the calculation the weight on the first burger on earth would be much less.
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>>7728973
my bad, not 2250000000000*330 - 1 , it should be 2250000000000*330 - 330
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This board is full of shitty threads so I am going to try to make a not shitty one.
ITT: We teach /sci/ something science or math related.
I am going to go through a basic explanation of what a Quantum Field is because I am pretty sure a decent bit of /sci/ is familiar with the basics of QM but not so much QFT.
Ok so a Quantum Field is essentially a sum of operators and wavefunctions.
Say we have a theory where the state vector [math] \left| {n\left( p \right)} \right\rangle [/math] represents the nth energy level of theory with momenta p.
Then we can define an annihilation operator, [math] {a_p} [/math], of the theory as an operator which lowers the energy of the state on which it acts.
i.e. [math] {a_p}\left| {n\left( p \right)} \right\rangle = c\left| {n\left( p \right) - 1} \right\rangle [/math] for some constant c.
A creation operator can be defined as the hermitian conjugate of the annihilation operator.
i.e. [math] {a^\dag }_p [/math] such that [math] {a^\dag }_p\left| {n\left( p \right)} \right\rangle = {c_2}\left| {n\left( p \right) + 1} \right\rangle [/math] for some constant c_2.
Creation and annihilation operators, of a bosonic theory, obey the following commutation relation. [math] \left[ {{a^\dag }_{{p_1}},{a_{{p_2}}}} \right] = \delta _{{p_2}}^{{p_1} [/math]
So for a simple wave function [math] {e^{ipx}} [/math] we can roughly define a quantum field: [math] \Phi \left( x \right) = \sum\limits_p {\left( {{a^\dag }_p{e^{ipx}} + {a_p}{e^{ - ipx}}} \right)} [/math]
Quantum Fields have the important property that they are an operator, or an observable.
A more accurate definition that fits any real scalar field, would be in the form of a momentum Fourier transform. i.e. [math] \Phi \left( x \right) = \int {\frac{{{d^3}p}}{{{{\left( {2\pi } \right)}^3}}}} \frac{1}{{\sqrt {2{E_p}} }}\left( {{a^\dag }_p{e^{ipx}} + {a_p}{e^{ - ipx}}} \right) [/math] where E_p is the energy of the field at momentum p.
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this is shit
poo in loo faggot
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how much maths would i have to know to take a quantum mechanics book and breeze through it
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You fucked up your latex OP. Besides, I don't understand any of the notation you're using whatsoever. But I have been looking for that pic for awhile it used to be my wallpaper but my computer broke so thanks for trying I guess.
Rate this school's chem program
*Modern maths is calculus for sciences
I have no fucking idea why they don't have them take differential equations, and linear algebra.
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>Quantum physics
>Chemistry Major
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>>7728172
>still in high school
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>>7728172
I was thinking of transferring there since it's an extremely cheap school, but they have some retarded course requirements.
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Did he do it /sci/?
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Someone here has to have an opinion on this.
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>>7728191
where is the paper?
What's the probability that the ? is a mine?
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1/13
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>>7727587
1/13
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Why?
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please help me sci not hmwk
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>>7727445
Nobody here has taken calc 2.
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>>7727445
Do you know how to use index notation, proving vector identities with tensors is a lot easier.
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>>7727445
OP here i'll post what I got to, I know the curl of the gradient of a scalar is 0 what next?