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/sci/ - Science & Math

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11136476 No.11136476 [Reply] [Original]
Quoted By: >>11136970 >>11137024

>inhaled hydrochloric acid again

5 posts omitted.
>> No.11136521
Quoted By: >>11136535

I inhaled lots of mustard gass when i was kid. Easily survived. You have to evolve in chemical gasses.

>> No.11136535


>> No.11136970

Could be worse, imagine if it was something really nasty, like oxygen.

>> No.11137021

Unless you are trying to kill yourself one of the worst ways possible by huffing the fumes it isn't that big a deal.
Stay upwind and you are fine with the vast majority of acids, wouldn't fuck with hydrofluoric without a respirator though.

>> No.11137024

Don't worry, antibodies from the first time will protect you.

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11136473 No.11136473 [Reply] [Original]
Quoted By: >>11137134

Hi 4chan,
I have madee a histogram and now I am trying to run a graph through it like pic related. Each colored area needs to have the same size as the other area from the same color. So the one read area under the histogram "bar" has to be the same size as the area above the bar and so one. How do I do this ?

9 posts omitted.
>> No.11136575
Quoted By: >>11136701

Yeah, it's for an uni assignment. I think I will have to resort to drawing it by hand...

>> No.11136605

above and below being equal lengths only works if you make your rectangles at the width scale of where each segment of the graph they intersect is approximately linear

>> No.11136701

You can render the graph in whatever package you have available and then just colour it in in paint.

>> No.11137121

Between every pair of adjacent bars put a point at the average height of the bars.
So if you have bars with height h, h' you'd put a point at (h+h') / 2.

Now for any bar with height h and it's pair of adjacent points (x0, y0) (x1, y1), create a polynomial

y0 + (x-x0)(y1 - y0) / (x1 - x0) + k (x-x0)(x-x1)

Where you pick k so so that integral of the polynomial over [x0, x1] is the same as the are of the bar, h*(x1-x0).

>> No.11137134


Use the same techniques as when learning how to integrate stuff. Don't remember what it's called anymore because I've already graduated and I'm an engineer

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11136443 No.11136443 [Reply] [Original]
Quoted By: >>11136613

13 posts omitted.
>> No.11136595
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Quoted By: >>11136618

Yeah, it's generally not hard to do as long as the engineers and technicians have a reasonably high IQ. But many communities in the US have problems there either from a "brain drain" effect or from simple demographic factors (often both).

>> No.11136613

No. There's no profit in it or incentive for it.

>> No.11136617
Quoted By: >>11137370

Climate change is not directly related to supply-demand considerations (apart from companies making public gestures of good will about the issue to attract green-minded customers) and carbon emissions have no cost in an unregulated market, so there's zero reason to think the free market would be able to solve the problem until well after it's too late.
Governments need to impose these economic incentives to reduce carbon output through regulations and tax credit systems, as well as subsidizing renewable technologies until they become competitive with hydrocarbons on their own.
Anyone who says we should let the "free market" solve this issue is 100% a shill for the companies who benefit from inaction and the status quo.

>> No.11136618

Flint's a good example of how you fix a problem.. Have you looked at its status for updated or just using its past history?
The big issue for Flint is lead levels reached unacceptable levels due to older infrastructure of lead based pipes that leeched into the drinking supply. Its also now at acceptable levels while the lead pipes are slowly being replaced. This was the fault of civil engineers not being psychic to know the harmful effects of lead.
Which have only been actively reduced in human consumption over the past 50 years.

>> No.11137370
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Congrats, you just killed economy!

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11136434 No.11136434 [Reply] [Original]
Quoted By: >>11136995

I'm gonna be honest /sci/, I got a real fucking problem regarding dyscalculia - difficulty in learning or comprehending arithmetic, such as difficulty in understanding numbers, learning how to manipulate numbers, performing mathematical calculations and learning facts in mathematics (From Wikipedia) - and I wanted to ask, is there a notable differences when spotting from a retard and folks like me? First time on the board btw.

10 posts omitted.
>> No.11136938

It's more serious than you think. Look it up.

>> No.11136995

Since most people don't even know what dyscalculia is, you're just gonna be looked at as a retard.

>> No.11137007
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>im 19 bro.

>> No.11137041
Quoted By: >>11138832

No, no, no.
Stop giving bad advice. Khan Academy is great for looking up a problem and then do your professors material, anything more than that and you fail.

I failed calc 2 twice because I did KA exercises, they are nowhere near the difficulty level provided. For example there are zero exercises for mean value theorems read up in graphs.

>> No.11138832

Because its made for people like OP who just want to do some autodidactic self improvement.

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11136405 No.11136405 [Reply] [Original]
Quoted By: >>11137560

bruhs its over

4 posts omitted.
>> No.11137295

many scientists don't seem to "realize" that, either.

>> No.11137560
Quoted By: >>11137565

I hate, but literally hate, when you have to kill a cat for results of gas released by detector, when to KNOW if cosmic radiation happened.

>> No.11137565

lightbulb, and even speaker would be fine

>> No.11137588

The original thought experiment uses a radioactive source to trigger the death mechanism, i.e. we don't know if an atom of uranium decayed or not at any given time. This isn't influenced by air particles but by quantum fluctuations.

>> No.11137591

Reductio ad absurdum more like. It was a way of saying quantum theory was incomplete, not that the whole foundation was retarded.

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11136396 No.11136396 [Reply] [Original]
Quoted By: >>11136542

>that one sperg who takes up all of the prof's office hours

>> No.11136542
Quoted By: >>11136754

>it's a grad student teaching the course
>he's too shy tell the guy who's asking bs questions that he needs to prioritize other students.

>> No.11136754
Quoted By: >>11136821

I've actually had this happen to me. I was teaching a lab course last fall and this one kid was struggling with basic python as a third year undergraduate

>> No.11136821

did you tell him about YouTube?

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11136378 No.11136378 [Reply] [Original]
Quoted By: >>11136529

Pic. unrelated.

Let's suppose I found mathmatical function, which generates some order (e.g. every number divisible only by 1 and itself )

How to correctly publish it?

5 posts omitted.
>> No.11136509

>I have no prior education in mathematics,
it shows.

>> No.11136520
Quoted By: >>11136525

I have 10 experience writting for loops, and I have used calculator like 20 years ago for first time.

>> No.11136525
Quoted By: >>11136527

>I have 10 experience writting for loops
better throw in the towel guys, we're dealing with a real tech wizard here

>> No.11136527

It sounds funky, but I've started with 2^10 computing power compared to guy with 20 years experience.

>> No.11136529
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>the absolute state of /sci/

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11136325 No.11136325 [Reply] [Original]
Quoted By: >>11136513 >>11136523

does climate change still not exist?

9 posts omitted.
>> No.11136471

Post ending in 404, self survival instinct not found.

>> No.11136486

Fuck rain annoying piece of shit

>> No.11136513
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posting fake news instead of science charts and facts

>> No.11136523
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It's funny how climate debate gets strawmanned so often by alarmists as "Hur dur they don't think climate change is real"
When the argument since the 70s has been.
"No the world is not ending in 1990, 2000, 2008, 2012, 2020, 2040, etc"
If you know the history of climate debate you know there has been a loud group of idiots claiming the end of human civilization based on "runaway" effects of co2 . Utter horswshit paeudo science that has models of predictions that are only reliable in one respect: being wrong.

>> No.11136608
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>its been debunekd! why? because it was debunked!! d-debunked deubked debunked!!!

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11136319 No.11136319 [Reply] [Original]

>be 19
>enroll mechanical engineering
>get assfucked by calculus, statistics and dynamics
Laters, virgins!

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11136318 No.11136318 [Reply] [Original]

How do I get into the whole quantum physics studying?

Trying to find a decent book I'm stuck reading about history or philosophy of it (obviously not what I am looking for) or I am thrown in the middle of it.

>> No.11136322
Quoted By: >>11136331

Griffith's quantum mechanics. If that's too hard I don't know what to tell you.

>> No.11136331
Quoted By: >>11136358 >>11136377

Ah but all books are either EASY, SHIT, or you don't have the prerequisites.

I actually have read the Griffiths QM and it is a great book. However, I'm still missing 90% of the Quantum mechanics concepts.

For example, just reading today I have met these unfamiliar concepts (never mentioned in Griffiths)
>"hopping of fermionic atoms into optical potentials"
>"spin-excitation in Mott insulator"
>"Berry phase of graphene"
>"Friedel oscillation"
>"Cantor alloy"

>> No.11136358

Physics is a huge field, and most of it has to do with quantum physics. Don't expect you will be able to learn everything from a single textbook.

Most of those terms you listed would be more likely to be explained in a condensed matter textbook. Although "Berry phase" is something that might be explained in a good QM textbook (if it's not in Griffith's try reading the wikipedia page), and make sure you read about the Bloch theorem and everything related to that in Griffith's if you want to jump into condensed matter.

>> No.11136377

Yeah I just double checked. Chapter 10 in Griffiths is on Berry phase. He talks about solids in chapter 5, which is an intro to a solid state textbook, which is what you really want to look at if you want to start to understand those topics (I've never even heard of a Cantor alloy, btw)

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11136275 No.11136275 [Reply] [Original]
Quoted By: >>11138042

Hello /sci/,
I'm pretty sure this question should be impossible to answer as we don't fully understand consciousness yet but maybe someone could chip in and give their two cents or a fresh angle. Basically I watched Cronenberg's 'The Fly' last night and it got me thinking about if someone's mind was to instantly become that of an insects or animals.
In my mind they would just die instantly as the Animal doesn't know how to operate its body or breathe.
Pretty morbid but I've thought about it all day...

15 posts omitted.
>> No.11137197
Quoted By: >>11137212

>What maoes you think so?
Flies are invertebrates, their nervous system isn't complicated enough to allow sentience.

>> No.11137212

>their nervous system isn't complicated enough to allow sentience.
What makes you think so?

>> No.11137244
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Quoted By: >>11137422

>I neve got his jokes. Looks like very low IQ (albeit perhaps educated) humor.
It is the height of irony comics. There's actually a brain barrier you have to break through to find them funny.

>> No.11137422
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No. It builds upon life experiences that low IQ people get themselves into, while smarter people avoid them from a safe distance, so they have no basis to relate to the jokes.

>> No.11138042

If you mangled human and fly matter together like in the fly, the results would probably resemble radiation poisoning or cancer. Now it depends on what you mean by mind, but yeah if you include the autonomic nervous system as part of the mind, then yes, it's instant death because it can't breath. If the spinal cord and the autonomic nervous system is preserved then the fly brain's going to have a difficult time seeing. Fly brains are adapted to work with compound eyes which are completely different from how our eyes work. IIRC fly eyes are mainly based around optic flow so they can avoid obstacles, although they may possess some object recognition capability. This has been studied quite a bit. I also don't think that a fly could learn to walk upright. Humans are big enough that signal lag time is a problem. We probably compensate for this with the cerebellum and other brain circuits which help predict things. The cerebellum is actually unnecessary, but without it, it seems to be more difficult to accomplish actions well. Fly brains probably do not have much in the way of motion planning circuitry either, so it will be difficult for them to control limbs. The fly brain might be able to make the human body crawl by running central pattern generator circuitry which we believe exists in the spinal cord, but it'll probably be pretty jerky.

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11136257 No.11136257 [Reply] [Last 50] [Original]

ITT: STEM thots
I'll start

99 posts omitted.
>> No.11139370
Quoted By: >>11139553

Please delete photo of my wife and never post it here. Thanks

>> No.11139544

I'd hide a few inches of my hidden figure in her.

>> No.11139553


>> No.11140211


>> No.11140919

yeah but homegirl can crack my pot any day of the week only thang that matters to a playa like me

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11136255 No.11136255 [Reply] [Original]

Are batteries the bottleneck and limiter of anything cool?

13 posts omitted.
>> No.11139380

Yes. Batteries and chemical propulsion.

>> No.11139510


heat is the limiting factor in most electrical applications

>> No.11139558

If you continue to the logical end of your claim, you'll find that material science at large is truly our bottleneck. From energy storage to heat dissipation to high strength low density materials, we just don't understand matter that well.

>> No.11139632
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>Are batteries the bottleneck and limiter of anything cool?

YES, with super batteries, you get:
humanoid robotics,
electric transportation (cars, planes, trains), wind and solar can solve our energy problems with huge batteries giving power when the sun does not shine and wind does not blow),
smart phones and glasses that last all day

We need MUCH better batteries.
Holy grail of batteries is:
1000 Wh/Kg with 1000 charges
must be cheap to make and environmentally safe

>> No.11140526

use a fuel cell instead

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11136171 No.11136171 [Reply] [Original]

>be me
>live in Morocco
>be forced to learn in the dead language that is French for some fucked up reason
>some dumb fucks here think that the fag lang is actually used by the scientific community
>just look for Indian dudes online explaining stuff instead of going to class
>aced it
>go to france because free education
>teachers keep looking for stuff online in french because they can't speak English
>they can't find shit
>holly fuck even the French are stupid
>talk to friends still living in morocco
>they think french is an international language
>university teachers in Morocco can't really speak french but they try use it to research because they also can't speak English and they never tried to before
>try to explain to my former teacher that he should learn English because it's easier and more efficient and everyone uses it and .... unless he wants to keep fucking around doing absolutely nothing of real value, or just translate from English to Arabic
>dumb fuck is convinced that french is superior
>scientific subjects will be thought in french in middle school and high school next year because of French lobbying (everything was thought in Arabic beforehand). Instead of translating the university's curriculum to Arabic or just using English because it's easier
when did you realize that third world countries are indeed fucked up because of foreign intervention? And that French genes are inferior?

36 posts omitted.
>> No.11137614

Parents are from Eritrea but I've read on language education in the developing world here and there.

>> No.11137760
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dude this shit is unfuckingreal whenever I see a Moroccan bro triggering the baguettes, they get absolutely ass blasted. Its like throwing a fucking grenade in a warehouse of grenades

>> No.11138025
Quoted By: >>11138091

You forgot the french parts of Switzerland and Belgium, which do speak proper french (with some vocabulary variations).

>> No.11138091

so like 1 million?

>> No.11138117

>if it isn't dead why do they keep trying to protect it from the english invasion.

That's true for all languages you retard

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11136168 No.11136168 [Reply] [Original]
Quoted By: >>11136209

I've been doing a bit of reading regarding aging and its causes.

As everyone is well aware, aging is supposedly just the result of improperly replicated DNA resulting in imperfect cells and function.

So what I've gathered from this, and from where future research is headed is this:

Halting or reversing aging in future may be possible, however, access to a younger 'pristine' form of ones DNA will make the earlier applications of this technology possible.

Apparently DNA is pretty sturdy stuff, but I have also read that it starts degrading in storage in under a year. Storing a -80 Deg/C in liquid nitrogen storage tanks seems to be the only way of flawlessly storing DNA indefinitely. Who the fuck has Dewar storage tanks lying around though right?

My question is this:

Does anybody know of any commercial enterprises that offer this service. Or is anyone aware of any other cheap/DIY method of reliably preserving DNA?

>> No.11136203
Quoted By: >>11136222

just print the code on paper and store at a dry and dark place

>> No.11136209
Quoted By: >>11136222

This is completely untrue, the cause is the progressive mismetallation of proteins/enzymes.

>> No.11136222
Quoted By: >>11136226

Which in turn causes ____?

I'm not here to discuss the finer mechanisms of aging. Broadly speaking what I said is true. What I am asking is how to preserve this.

But....I'm pretty sure its still incredibly hard to get your entire genome digitally sequenced right?

>> No.11136226
Quoted By: >>11136239

Which in turn causes what? Mismetallated proteins cannot work as "intended" which directly leads to the deterioration we see.

>> No.11136239

Okay. Thanks for the lesson.

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11136140 No.11136140 [Reply] [Original]
Quoted By: >>11136554

What kind of academics or expertise is needed for military applications and work in the military_industrial complex?

>> No.11136554

>knowledge of the fundamentals of MechE, EE, and programming
>good at interdisciplinary engineering projects
>good at teamwork

This is if you’re a normie coming out of college

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11136117 No.11136117 [Reply] [Original]
Quoted By: >>11136172

Scientific moggings so hard you can see them from space

9 posts omitted.
>> No.11136172
Quoted By: >>11136196

what is in this picture?
took me a second to realize the difference in crop yield
btw you can see Sinjar in that photo, where ~5 thousands of ppl died a few years ago

>> No.11136175
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Quoted By: >>11136517

theres no satellite data for mainland china but this is a difference between taipei and tokyo. tokyo has more urban sprawl (by far) but less skyscrapers
not all buildings loaded a 3d model though

>> No.11136196

Lop Nur
Used to be a lake / marshland area. Then it became a nuclear testing site. Then a fertiliser plant where they, iirc, skim rare salts out of the “lake” water.
Iirc the commies diverted water away from it in a project so it dried up. Before that, the location of the lake would wander around, hence its name, meaning “wandering lake”.
Ancient Chinese sources claim it used to be massive.

>> No.11136517

Horse shit. i lived in Taipei for years. Downtown tokyo has way more tall buildings than Taipei.
Before Taipei 101 the tallest building was the Mitsukoshi Building and it wasn't even 50 floor tall.
Shit, the picture of Taipei you're showing is focused on only a couple blocks. When I first moved there I lived in the Hyatt, that U-shaped building right above that squatty pyramid looking building (It's a big ass trade center).
The thing with Taiwan, even more than Japan, is that most of the cities are super dense because there's literally nowhere else to build except in river valleys and right at the coast.
The scale between those two pictures is fucked.

>> No.11136544


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11136110 No.11136110 [Reply] [Last 50] [Original]
Quoted By: >>11140313

Is there any truth to the idea that intelligence is mostly inherited from the mother?

88 posts omitted.
>> No.11140083

30% of 132+ IQ are women, 70% are men
i think there is some truth to that

>> No.11140281
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Quoted By: >>11140547

Why are dumb women incapable of having sex?

>> No.11140313

>no fucking source

>> No.11140547


the graph shows the smartest women are the ones most incapable of having sex

>> No.11140579

>"The right" wants to convince you that everybody can succeed, if only would they pick up their ass, and work.
No, that's also part of the leftist view.
The right's view is that achievement is limited by innate ability, and innate ability isn't equal. Their problem is they conflate happenstance (e.g. being born rich) with ability.

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11136106 No.11136106 [Reply] [Original]
Quoted By: >>11139916

high stakes paper plane duel in 3 hours
I need one that goes far

25 posts omitted.
>> No.11139916

make it into a cylinder and spin it as you throw it.

>> No.11139945
Quoted By: >>11140035

is op kill?

>> No.11139952

Question: What do stabilizer fins even do? I cant see how they... oh wait

is it that due to the flat top of the main wing theres lower pressure inside the fin than outside, and the fins just use this effect for lateral forces?

>> No.11140006
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paper planes are all the same under ambient topology

>> No.11140035

RIP OP. shouldve asked /po/

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11136105 No.11136105 [Reply] [Original]
Quoted By: >>11136121 >>11136341

What happens in Neuralink? Why so secretive? Are they merging fish head onto human bodies?

>> No.11136121
Quoted By: >>11136125

They had a huge announcement where they explicitly stated what they're doing and you think they're secretive?

>> No.11136125
Quoted By: >>11136303

Well considering how much Elon Musk braggs about Tesla/SpaceX, wonder why he doesn't do the same for Neuralink.

We're becoming Sheeple.

>> No.11136303

There just isn't that much to brag about. They're not that advanced. Maybe in a few years we will hear more.

>> No.11136338

The technology turned out to be so effective that there's no reason to sell it to people. When your brain implants make you so much smarter than everybody else, it's easy to find better ways to make money.

>> No.11136341

Nothing happens because Neuralink is nothing

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11136016 No.11136016 [Reply] [Original]
Quoted By: >>11136291 >>11136296

>Put in a molecular equation and it gives you the total ionic equation


6 posts omitted.
>> No.11136096
Quoted By: >>11136263

the older you get the harder it becomes to adquire new knowledgement, don't let that to dicourage you though, you can sill be successful nevertheless. In general chem sucks but if study with classmates it will become easier to pass through. The key for chem is a mix of efficency and rigor.

>> No.11136263

Were you 60 when you first started learning English?

>> No.11136291

Teachers got problems with my attendance.

>> No.11136296

Also private companies got that, you've gotta make your own, it's not that hard programming project, you can also simulate explosions if you are into fluid dynamics.

>> No.11138051

Everything stayed in the same state (aqueous) except PbCl2(s) because you have all aqueous on the left and a solid on the right. Intuitively the reaction was the formation of PbCl2.

Answer is
Pb2+(aq) + 2cl-(aq) -> PbCl2(s)

The other ions are spectator ions because they didnt participate, they all stayed in the same state. You can verify real quick, the 2 K+ got with the 2 (NO3-) and stayed aqueous with the same charges. The two remaining ions in the reaction formed a solid.

t. Someone who got decent grades in chem classes without any studying aside from doing the practice homeworks. Everything in your first chemistry class is intuitive and can be almost literally figured out on the spot and determined logically.

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11135954 No.11135954 [Reply] [Original]
Quoted By: >>11136406 >>11136475

Where can I find information on limits (and other high school level maths)?

3 posts omitted.
>> No.11136214
Quoted By: >>11136483

Protip for murican brainlets: nobody fucking uses shit like "Algebra II" or "Calculus III" outside of the freedomland.

>> No.11136406

Khan Academy

>> No.11136475


>> No.11136483
File: 408KiB, 659x491, algebrabooks.png [View Same] [Google] [iqdb] [SauceNAO]
Quoted By: >>11136581


>> No.11136581

This enumerates tomes you absolute fucking brainlet.

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11135902 No.11135902 [Reply] [Original]
Quoted By: >>11135935

This isn't a homework problem janny boy so please don't delete it. This is a personal project, I'm building a machine and need to attain a better understanding of the physics before I'm able to build a machine that can get the job done. (see this thread if you really give a fuck http://boards.4channel.org/g/thread/73483873)

Suppose you've got some material jammed in a pipe or a hole of some sort, that is it's surrounded on all sides by metal, it has some depth L, and some cross sectional diameter D. What is the theoretical calculation you could do that would quantify how much force you'd need to push this thing out?

In the orientation my machine will be in, the material is held up entirely by friction, the weight of the material itself is negligible. I've been looking into some pressure vessel equations as a guide to understand the situation when it's static, but I'm not sure if that is even valid. The material is hard and doesn't infinitely deform under shear, so I don't think any of the equations from fluid mechanics would be useful as a guide either.

I have many questions that will follow once I properly understand how much force is required to push the material out, but those can wait for other threads.

2 posts omitted.
>> No.11135918
File: 16KiB, 425x475, pierce_shear.gif [View Same] [Google] [iqdb] [SauceNAO]
Quoted By: >>11135927

Punching Force = Punch Perimeter × Stock thickness × Material Shear Strength.

>> No.11135919
Quoted By: >>11135944

>depends on degree of jam and slipperiness of materials

These are non technical terms for the friction coefficient, correct?

>> No.11135927

I wasn't aware that this existed, thank you for the information.

This would be a huge overestimate of the amount of force though, wouldn't it? Because I'm not trying to punch through a metal, rather I'm trying to remove debris that is stuck in a metal hole. So the shear strength of the surrounding metal wouldn't matter, would it?

>> No.11135935

You need to know the friction coefficient between the materials.

>> No.11135944

slipperiness is frict coefficient

jam is shear force as others r mentioning

like pressing down on an object and trying to slide it against the floor or wall

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11135896 No.11135896 [Reply] [Original]

I not sure where to ask this other then directly calling up a university that were doing these studies.

So I was looking up Teenage drinking leading to permanent brain damage articles but they don't say how much drinking specifically the patients were doing, not even a example it's always

"repeated heavy drinking" or "Binge drinking" how much is that?, 4 + standard drinks every weekend?, 4+ standard drinks every third day?.

Anyone know where I could find a answer?

1 post omitted.
>> No.11135930
Quoted By: >>11136026

I'm way past teenage hood, and drinking I was just interested in the patient data.

>> No.11135931

Even as a teenager you knew it was poison. The body is quite clear about it.

>> No.11135995


>> No.11136001
Quoted By: >>11136026

>I not sure
You definitely got brain damage.

>> No.11136026

Look I'm just curious for a amount, reading about it spooked me but even my mate who's becoming a neruoscientist still drinks heavily at parties.

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