Feasibility of a Fusion Reactor within the next ~50 years?
My heart says yes
My mind says maybe...
My dick says FOR THE GOD EMPEROR!
>>8468367
I'm going to guess that's >40,000 ears of waiting then.
>>8468363
Once I finish my PhD in nuclear physics, we'll get it within a couple of years, I just need funding.
I couldnt find any papers on this and Wikipedia just tells me that the observable universe can be assumed to be a sphere. However this makes absolutely no sense so me, since it doesnt account for what we can actually observe at any given time.
I gave it some thought and came up with pic related as a 2 dimensional representation of what would be a 4 dimensional cone. The three spacial dimensions being reduced to the x-axis.
Everything inside the cone is pretty much the space that we can see at this moment, with the hind barrier probably being the background microwave radiation projected to the then opaque space.
Any ideas?
>>8468253
what you drew is called a world line
also its called geometry of the universe, not shape, and there are literally thousands of papers on it.
>wants to make a point about the shape of the observable universe
>argues with the shape of a graph that includes time and has all spacial dimensions reduced to a single one
>>8468253
>observable universe
>observable
see hubbles law - this should point you in the right direction
There are people on this board RIGHT NOW - and in fact there's plenty of them, not just one or two weirdos - who ACTUALLY and completely UNFACETIOUSLY went to vote. That's right. They went to vote.
I cannot for the life of me find an example of MORE BASIC MATH than
> one divided by SIXTY FUCKING MILLION is a statistically negligible number
This obvious fact is not a factor in all these people's reasoning.
"Muh patriotism Stockholm's, it's my civilian dooty", on the other hand, is.
> hurr does that mean as a law enforcement agent I've spent my life making statistically negligible improvements?
Yes it does. You can cry now, catharsis is good for you.
How does that make you feel?
>>8468244
Using that same logic the less people turn out to vote, or become dissuaded to vote, the more important it becomes to vote.
Also due to the electoral college system, your vote is worth a helluva a lot more if you live in a battleground state. An individual vote in a state which is incredibly close to going 50-50 has incredible significance.
>>8468247
> Using that same logic the less people turn out to vote, or become dissuaded to vote, the more important it becomes to vote.
Doesn't contradict the OP's statement. One less vote changes fuck all.
THERE IS NO EQUIVALENCY BETWEEN
> one person not voting
and
> EVERYBODY not voting
I CANNOT FUCKING STRESS THIS ENOUGH IT'S NOT ROCKET SURGERY FOLKS
>>8468259
That is true, the other part of the person you replied tos statement is however also true. You can have your vote become one in a thousand if you live in the "correct" state. That being said i've never voted and will likely never vote.
how do you prove the product rule? i only know of
>>8467827
It comes from the chain rule i believe. Sometimes in Calculus you are given results that cannot be proved using the math you know yet. If you take analysis you'll learn more about such things.
I believe that the Leibniz rule is necessary to ensure that directional derivatives of a curve belong to the tangent (vector) space at the point of the curve in question.
It's the simplest construction you can make to that effect. At the most abstract level, the rule is not proven, it is axiomatic.
If you want to ensure that it works for all differentiable functions in Analysis or something, then you can start talking about limits and whatnot.
You shouldn't be thinking of the derivative as a discovery though: it was created to have very particular properties, and satisfying some form of the Leibniz rule is one of them.
>>8467903
the only interpretation of the proof i have in my notes is one involving duv/dx=(u+du/dx)(v+du/dx)-uv
is this what you mean by axiomatic in that it relies solely on fundamental arithmetic?
When will have hive cities?
I'm talking about a city encapsulated in a single massive building. Many skyscrapers are mini versions of this with their own apartments+dining+shopping+etc, but I want to know if they'll really take off. Do physics and architecture even make this possible?
>>8467699
Looks and sounds depressing as hell. But at the same time comfy, depending on living arrangements.
>>8467707
But it'll no doubt become an economical necessity. Efficiency is the top priority in industry and I bet a lot of people said the same things about cities. "You want me to give up my car and take the bus to work everyday? Live in an overcrowded concrete hellhole instead of the beautiful countryside?" There are people who'd do it. Koowloon was basically the first I think.
>>8467699
we are not bees fuck off
So I had an idea. I'm not the most intelligent guy when it comes to physics, but I like to wonder, and I figured I'd ask here. If we built five or six giant poles around the Earth, with a ring balanced on top of them, and then removed all of the poles, would the ring just keep falling around Earth forever? If so, could we hook it up to a dynamo and generate gravity-powered perpetual energy?
>>8467490
the answer is obviously no and i'm much too lazy to even think about why and you should be too
>>8467490
the total force on it would be zero. therefore it wouldnt do anything (regarding earths gravity).
>>8467490
Let's take the problems step by step.
1 Material.
What material could you make this ring with that would be sturdy enough to not just bend/break/stretch? Suppose you have a meter thick steel ring. Its still prone to bend at some point during setting it up.
2 Earths gravity.
Gravity isn't evenly distributed across the planet. Some areas have a higher gravitational pull than others. So one side of the ring will be pulled more strongly than the other.
3 the moon.
The moon would pull on the side of the ring closer to it. Just look at the ocean changes of tide.
And 4
>keep falling around the earth forever
No. Even if 1-3 didn't apply and you had a ring floating around the earth, the act of hooking it up to a dynamo would change its rotational momentum over time until it was the exact same velocity as the earth. And then no energy could be harvested. Or something.
TL;DR wouldn't stay in orbit around earth, couldn't get electricity from it.
Does being born through a woman's vagina make you a brainlet?
I was born by cesarean section and I have an IQ of 140 and a degree in physics.
>>8467393
>be in kindergarden
>have friend
>named mickey
>he tells me thats where they cut him out of his mom's tummy
>fast forward
>be in HS
>mickey tryna act hard
>says it's a stab wound
>drops out of HS
>goes to prison for 5 years for armed robbery in neighboring state
You and mickey were both born by cesarean. It has no real difference desu unless something gets fugged up
btw only roasties wanna get c-sections
I don't think so, I too was born via cesarean and an IQ of 140
>>8467393
If you have an IQ of 140 you really should've accomplished more in your life by now.
People with IQs of 100~ can get degrees in physics just by studying hard.
Could we find another function under which a field is closed that makes it as useful as [math]\mathbb{C}[/math]?
>>8467306
Yeah, and in fact we did. But a brainlet like you wouldn't understand.
>Could we find another function under which a field is closed
do you even know what you're talking about? this doesn't make any sense
>>8467323
[math]\mathbb{C}[/math] is closed under the square root function.
For all [math]z \in \mathbb{C}[/math] we have [math]\sqrt{z}\in \mathbb{C}[/math].
Generalization for a field [math]\mathbb{F}[/math]:
For all [math]x \in \mathbb{F}[/math] we have [math]f(x)\in \mathbb{F}[/math].
Are there function such as the square root that would make for useful algebraic structures?
Will there ever be a general formula for solving integrals? (Given a set of special functions.)
Right now solving integrals feels shady business.
>>8467226
There and it is the formula for the integral of ax^n
What you have to understand is that transcendental functions (ones that cannot be expressed as polynomials) are really random and almost don't even make sense.
In Set Theory we consider functions to be any set of ordered pairs of the form (a.b) such that if (a.b) is part of the function then (a.c) for any c not equal to b must NOT be in the set.
Like this we make sense of transcendental functions that really make no sense from a traditional algebraic perspective. To understand this I ask you, what generates the values of the sine function? And I don't mean the approximations our calculators, I mean what actually generates them? A bunch of fucking triangles.
Does it make sense to take the integral of a triangle? Well, not really. But our theory of limits (which came way after the integral) allows us to make sense of stuff like the integral of cosx is sinx.
Now that we understand that transcendental functions are really weird and actually arbitrary (could be literally anything) then it makes sense to approximate our well behaved transcendetals as infinite polynomials and work with them like that. That is how computers do it and that is how you will have to do it from time to time because if you don't then nothing makes sense about these functions.
So there is a general formula for integrals and that is the integral of a polynomial, as those are the fundamental (and arguably the only) algebraic objects.
>>8467226
>So there is a general formula for integrals and that is the integral of a polynomial, as those are the fundamental (and arguably the only) algebraic objects.
Why bother with other methods then?
>>8467226
Take a look at differential Galois theory. It deals with the question of which indefinite integrals can be expressed explicitly in terms of known functions.
>>8467276
>transcendental functions (ones that cannot be expressed as polynomials) are really random and almost don't even make sense.
You're a fucking retard. Or a master baiter.
What is wrong with the people on /x/?
>>8467215
Same as the people on /pol/, except with aliens instead of other races.
>>8467215
They took the X-Files too literally.
It starts with an A and finished with UTISM
> TFW you believe that magic exists
> TFW you don't believe dark energy or dark matter exists.
Dark energy is bullshit but magic is real. Meme magic is my evidence. Stats on a piece of paper to prove dark energy exists is all make believe. In fact fairy tales are more believable.
> you're a wizard, Harry.
>physicists are /x/
How is anybody surprised?
>>8467050
there's plenty of evidence to support the existence of mysticism, the only way to make it not exist is not to believe in it, and to make it exist just believe in it
>>8467170
uhhh are you mentally healthy
Hey guys last thread died before I got answer from this anon:
>This isn't meant to insult you OP, but don't get memed into studying actual analysis, because it is going to be a waste of time for your exam. Best info I can give you is get some lecture notes for calc I to III and learn basic stuff about polynomials and complex numbers which I assume is precalculus. If you want any more detail, post the syllabus.
Hope you can help me, already learned some basic shit but trying to make a huge spidermap or something of the sorts of what I have to learn to get to pic related
Last thread >>8461642
Hey /sci/
I have my exams in roughly 10 weeks and I basically didn't do anything all the time.
I made a strict plan for the next 10 weeks to master my exams as efficiently as possible.
The next 3 weeks starting now I'm going to devote to learning the basics of maths from all high school to uni (including first year).
During my high school time and even now I was pretty retarded regarding maths, I didn't catch the drift from the beginning and just let it slide. I still easily passed by compensating with other subjects so I never had to learn, so I could play vidya all day long (big mistake).
Anyway now I'm in trouble because compensating is much harder and I need maths anyways in my life to succeed in a /sci/ subject.
Can you guys recommend me any comprehensible, compact and retard-proof booklets/scripts (including easy-middle-hard excercises with solutions) to learn basic maths rules up to pic related?
Do you think it's feasible or should I rather concentrate on the other subjects to compensate (I'd really like to understand maths finally though).
Already browsed sticky also learning some basics with khanacademy.com but it's quite slow with videos.
Happy for any help.
tl;dr
>compact and comprehensible booklets/scripts from high school to pic related math tier
>>8467033
It's not that hard desu, you need some calculus skills, but nothing wrong.
>>8467058
any recommendations script/booklet-wise summing up BASIC maths rules, pre-pre calculus, pre-calculus and calculus up to pic related?
in a dense but nice and clear format with examples?
basically a walkthrough from 1st high school class to pic related?
or can you tell me what I have to learn step to step to get there?
>>8467033
Having a strong foundation in algebra and it's arithmetic is important before you move up.
Is evolution efficient as its designs?
>>8467005
(OP) or better yet, does it tend toward efficient designs?
>>8467010
If it means it will be better at generating offspring, yes. Otherwise no.
Evolution can only tend towards to the local optimum instead of a global optimum. These means that there will likely never evolve an organism with wheels despite wheels being more efficient than limbs
So I didn't use like any of the given measurements but I still got an answer using the Free Body Diagrams. I got that the maximum weight is 707.1lb.
Am I mentally challenged or can this be as easy as it seems?
Here's my work
>>8466988
Whoops, got that rotate for ya
>>8466979
>hoe problem
This isn't the place to discuss issues with your mother.
How do you get As in math courses, /sci/? I've never done it in my life.
depends on the grading scheme
but math is one of the easiest subjects to get full homework grades in (exams are obviously a different story):
start early (literally just spend like 15 minutes on each question as soon as you get them to get a feel for them)
once there's 2-3 days before the assignment is due, whatever you're still confused on try to get some sort of help with (from classmates/professor)
once its the day before its due start frantically asking around (again classmates, professor, google, /sci/, stackexchange...)
>Math courses
Just have a 100+ IQ and put some fucking effort in.
Also, grow out of studying liberal arts like literature, history, sociology=psychology, etc.
>>8466983
Fuck, forgot to mention. Statistics is dead as a field thanks to the Brexit and US election results, but you'll find it easier and maybe more useful than calculus if you really have doubts about your mathematical abilities.