/sci/ - Science & Math

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Books to learn maths

Anonymous Thu 02 Jul 23:51:18 2020 No.11861925 View Reply Original Report

Quoted By: >>11863530 >>11863879 >>11864010 >>11864421 >>11864427

I dont remember anything I learned on highschool, the only things I can do are multiplications, divisions and some really simple algebra stuff. I would like to have a good guide to try to learn all the stuff I missed/forgot

5 posts omitted

Anonymous

Anonymous Fri 03 Jul 2020 16:21:02 No.11863530 Report

Quoted By:

>>11861925
Khan academic for the basic stuff, then any decent calculus book

Anonymous

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Anonymous Fri 03 Jul 2020 18:26:02 No.11863879 Report

Quoted By:

>>11861925
>>11863136

Yeah. Just figure it out as you go.

Pic related

Anonymous

Anonymous Fri 03 Jul 2020 19:07:56 No.11864010 Report

Quoted By:

>>11861925
Stilt and Zeager's Precalculus

Anonymous

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Anonymous Fri 03 Jul 2020 22:17:20 No.11864421 Report

Quoted By:

>>11861925

Anonymous

Anonymous Fri 03 Jul 2020 22:22:17 No.11864427 Report

Quoted By:

>>11861925
The Gelfand book from the sticky is actually great if you really want to know how things work, kind of forces you to reinvent everything from the basics if you didn't already know, so you're not likely to forget once you really understand.

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Anonymous Fri 03 Jul 16:27:28 2020 No.11863558 View Reply Original Report

Quoted By: >>11863747 >>11863751

Entropy does not exist, change my mind.

1 post omitted

Anonymous

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Anonymous Fri 03 Jul 2020 17:43:21 No.11863747 Report

Quoted By:

>>11863558
Seconded. Check out my proof.

Anonymous

Anonymous Fri 03 Jul 2020 17:43:44 No.11863749 Report

Quoted By:

As time goes on, energy becomes more spread out.
I dunno what to tell you

Anonymous

Anonymous Fri 03 Jul 2020 17:44:24 No.11863751 Report

Quoted By: >>11863793

>>11863558
You don't know what entropy is. Change my mind.

Anonymous

Anonymous Fri 03 Jul 2020 17:59:09 No.11863793 Report

Quoted By: >>11864407

>>11863751
Yes I do. That's why I can, for a fact, tell you that entropy is an extensive property of a thermodynamic system. It quantifies the number ? of microscopic configurations (known as microstates) that are consistent with the macroscopic quantities that characterize the system (such as its volume, pressure and temperature). Under the assumption that each microstate is equally probable, the entropy S is the natural logarithm of the number of microstates, multiplied by the Boltzmann constant kB.

Anonymous

Anonymous Fri 03 Jul 2020 22:13:42 No.11864407 Report

Quoted By:

>>11863793
>Yes I do. That's why I can, for a fact, tell you that entropy is an extensive property of a thermodynamic system. It quantifies the number ? of microscopic configurations (known as microstates) that are consistent with the macroscopic quantities that characterize the system (such as its volume, pressure and temperature). Under the assumption that each microstate is equally probable, the entropy S is the natural logarithm of the number of microstates, multiplied by the Boltzmann constant kB.
>says all that... still doesn't know simple statistics to answer his question (what is the nat ln of microstates and what does it represent physically)

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Anonymous Thu 02 Jul 19:29:10 2020 No.11861042 View Reply Original Report

Quoted By:

You could fix anything if you could program DNA.

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Anonymous

Anonymous Fri 03 Jul 2020 02:32:55 No.11862239 Report

Quoted By:

>>11861632
their @'s?

Anonymous

Anonymous Fri 03 Jul 2020 08:19:17 No.11862802 Report

Quoted By: >>11864297

>>11861204
> Is Russian
I thought there were no homosexuals/trannies in Russia?

Anonymous

Anonymous Fri 03 Jul 2020 08:47:54 No.11862844 Report

Quoted By:

>>11861204
Liking that cutie isn't gay at all.
It's a scientific fact.

Anonymous

Anonymous Fri 03 Jul 2020 21:07:13 No.11864276 Report

Quoted By:

>>11862234
You could probably find the dna strand responsible for the release of endorphins related to love and attachment and modify it to inhibit specific reactions.
You might even be able to alter a person's dna so that they are no longer able to feel any sort of attachment whatsoever. If it's something that could be reversed, you could use this on soldiers, perhaps finding a way to eliminate empathy on the battlefield and reduce PTSD and the cist associated with it.

Anonymous

Anonymous Fri 03 Jul 2020 21:20:04 No.11864297 Report

Quoted By:

>>11862802
The more a society supresses a degenerate behavior, the more it crops up. See middle eastern countries and the amount of gay porn they watch.

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Anonymous Fri 03 Jul 17:12:22 2020 No.11863659 View Reply Original Report

Quoted By: >>11864295

what are you doing to make science more inclusive?

https://www.sciencemag.org/news/2020/07/amid-protests-against-racism-scientists-move-strip-offensive-names-journals-prizes-and

24 posts and 5 images omitted

Anonymous

Anonymous Fri 03 Jul 2020 20:47:14 No.11864219 Report

Quoted By:

>>11864203
If a religion directs the conditions under which people should reproduce (they generally do) then it's applying a selective pressure to any population that adheres to it. Whether or not this is 'eugenic' depends on whether or not you believe the effect of this selective pressure is good or bad.

>Eugenics; from Greek ??- "good" and ????? "come into being, growing")
Whether you consider the effect of a particular selective pressure good or bad is up for you to decide.

Anonymous

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Anonymous Fri 03 Jul 2020 20:48:32 No.11864220 Report

Quoted By: >>11864229

>>11864044
It's not as much about opinion as much as it is who held them.
You can't have brilliant men of science holding contrarian views because science and all its achievements are "theirs", therefore the background must be hidden or rewritten to maintain the narrative.

Anonymous

Anonymous Fri 03 Jul 2020 20:48:43 No.11864222 Report

Quoted By:

>>11864088
In White Fragility, the author relates how a woman at one of her seminars had a heart attack. She spends a page having a tantrum about the CHUTZPAH this woman had for this, she KNEW this vile act of anti-semitism would put her in the spotlight!

Make of that what you will.

Anonymous

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Anonymous Fri 03 Jul 2020 20:51:59 No.11864229 Report

Quoted By:

>>11864220
....

Anonymous

Anonymous Fri 03 Jul 2020 21:19:16 No.11864295 Report

Quoted By:

>>11863659
I spit at women teaching in stem because it hurts my muslim feelings.

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Anonymous Fri 03 Jul 18:36:43 2020 No.11863915 View Reply Original Report

Quoted By:

Redpill me on the damages caused by smoking weed.

9 posts and 1 image omitted

Anonymous

Anonymous Fri 03 Jul 2020 19:06:03 No.11864005 Report

Quoted By:

>>11863995
sauce... Is there a way(general advice) to finde affordable cbd? the stuff i've seen in offices around here is crazy high for a dropper bottle...

Anonymous

Anonymous Fri 03 Jul 2020 19:24:10 No.11864048 Report

Quoted By:

>>11863967
That’s fine, we don’t look at you at all

Anonymous

Anonymous Fri 03 Jul 2020 19:25:49 No.11864060 Report

Quoted By:

Bad for your working memory. Lot of the research shows that if you smoke a lot of weed in your teen years you stunt your intellectual potential from what it could have been.

Anonymous

Anonymous Fri 03 Jul 2020 21:09:41 No.11864279 Report

Quoted By:

for adults:

used infrequently, it can actually increase IQ, much like alcohol
with abuse or overuse, it decreases IQ
all changes in IQ were unobserved after 3 month break from smoking, no permanent damage

Anonymous

Anonymous Fri 03 Jul 2020 21:11:30 No.11864282 Report

Quoted By:

i cant even get high anymore after the cops poisoned me

>fucking help me you gooks

its basically an M1

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Anonymous Tue 30 Jun 08:51:52 2020 No.11852817 View Reply Original Report

Quoted By:

Why does chemistry suck so much? Why do I have to study this shit? Fuck it, I just wanted to do physics.

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Anonymous

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Anonymous Fri 03 Jul 2020 20:13:06 No.11864146 Report

Quoted By: >>11864152

>>11864144

Anonymous

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Anonymous Fri 03 Jul 2020 20:15:47 No.11864152 Report

Quoted By: >>11864154

>>11864146

Anonymous

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Anonymous Fri 03 Jul 2020 20:17:19 No.11864154 Report

Quoted By:

>>11864152

Anonymous

Anonymous Fri 03 Jul 2020 21:00:57 No.11864253 Report

Quoted By:

>>11853042
No one likes your shitty hexagon pentagon doodles

Anonymous

Anonymous Fri 03 Jul 2020 21:08:55 No.11864278 Report

Quoted By:

>>11861865
How

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Anonymous Fri 03 Jul 20:52:29 2020 No.11864233 View Reply Original Report

Quoted By:

For me, its the WSR-88D.

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Anonymous Fri 03 Jul 04:14:47 2020 No.11862399 View Reply Original Report

Quoted By: >>11864234

Is a pandemic a natural disaster?

4 posts omitted

Anonymous

Anonymous Fri 03 Jul 2020 04:28:10 No.11862415 Report

Quoted By:

>>11862408
We don’t know for sure that they’re not from before humans https://www.scientificamerican.com/article/experts-where-did-viruses-come-fr/

Anonymous

Anonymous Fri 03 Jul 2020 04:28:36 No.11862416 Report

Quoted By:

>>11862408
The Wuhan Institute of Virology is pure coincidence.

Anonymous

Anonymous Fri 03 Jul 2020 04:55:05 No.11862458 Report

Quoted By:

No, its a natural necessity.

Anonymous

Anonymous Fri 03 Jul 2020 18:15:19 No.11863842 Report

Quoted By:

>>11862405
>At least most natural disasters are localized, and not globe-spanning.
They most certainly can be.
Remember the eruption of stupid-icelandic-name volcano a few years ago that fucked up air travel in Europe for months? And that was a baby-nuts eruption.
A supervolcano like yellowstone would have global consequences.
Look at the year without a summer where an eruption in indonesia goofed up global weather.

Anonymous

Anonymous Fri 03 Jul 2020 20:53:05 No.11864234 Report

Quoted By:

>>11862399
No. No disease spreads "naturally" in the 5 continents.

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Ball + train collision

Anonymous Thu 02 Jul 17:48:40 2020 No.11860714 View Reply Original Report

Quoted By:

Is this correct? This isn't my homework. This is something that was discussed on r9k and I think everyone got it wrong.

They said when a ball and train collide (elastically) and they're both initially going at 100 km/h in opposite directions, a bystander will see the ball bouncing back at 300 km/h. To me this is just wrong. Check pic for my explanation.

20 posts omitted

Anonymous

Anonymous Fri 03 Jul 2020 09:02:49 No.11862876 Report

Quoted By: >>11863095

>>11862849
op seemed to ask the pushback velocity, and you cannot calculate that without the masses of the two objects

op mentioned this question is asked in terms of elastic collision, which forces us to use Potential energy (mgh) and Kinetic energy (0.5mv2) in state 1 and state 2, or am i missing something? i dont even have half a clue how anyone could get 300 km/h , there is no data here kek

Anonymous

Anonymous Fri 03 Jul 2020 12:04:03 No.11863095 Report

Quoted By:

>>11862876
>i dont even have half a clue how anyone could get 300 km/h , there is no data here kek

I asked my friend who's an engineering student and he intuitively said 300 km/h. I have no idea how to prove this formally but his thought process was:

>1. Train sees the ball approach at the relative velocity of 200
>2. The ball bounces back at the same relative velocity of 200
>3. What the observer sees is the velocity of the train + the relative velocity of the ball (200), which is 300

Anonymous

Anonymous Fri 03 Jul 2020 14:48:21 No.11863339 Report

Quoted By:

>>11862780
Which problem? The physics problem has already been solved in the limit as the mass ratio goes to infinity. 300 km/h. The problem of getting OP's intuition to work right hasn't been solved, and probably requires some experiments with a well-equipped high school physics lab.

Anonymous

Anonymous Fri 03 Jul 2020 14:50:12 No.11863340 Report

Quoted By: >>11864232

>this thread
The absolute state of /sci/

Anonymous

Anonymous Fri 03 Jul 2020 20:52:27 No.11864232 Report

Quoted By:

>>11863340

What wrong bredda?

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Anonymous Fri 03 Jul 13:28:31 2020 No.11863203 View Reply Original Report

Quoted By: >>11863676 >>11863706 >>11864126

how do I become an extrovert?

7 posts omitted

Anonymous

Anonymous Fri 03 Jul 2020 17:18:39 No.11863676 Report

Quoted By:

>>11863203
You can't force yourself to like something like hanging out with people. I tried to become an extrovert when I was around 20-21. All it did was teach me not to put other's experiences on a pedestal. Getting a boy/girlfriend is not a big deal. Going out to a club is not a big deal. Hanging with bros or galpals or whatever the fuck you got yourself into is not a big deal. Just try to enjoy experiences for what they are.

Timeline !5EJ71eKlNQ

Timeline !5EJ71eKlNQ Fri 03 Jul 2020 17:23:54 No.11863691 Report

Quoted By:

>>11863368
Akarin. All future intel confirms this.

Anonymous

Anonymous Fri 03 Jul 2020 17:28:54 No.11863706 Report

Quoted By:

>>11863203
Raise oxytocin levels. A traditional way to do this is religion. Although any way you do it will probably result in you doing a lot of dumb things while you adjust.

Anonymous

Anonymous Fri 03 Jul 2020 19:56:09 No.11864117 Report

Quoted By:

>>11863313
but stop as soon as you hit the sweet spot
go further and you ruin it

Anonymous

Anonymous Fri 03 Jul 2020 19:59:33 No.11864126 Report

Quoted By:

>>11863203
You don't. Extroverts and introverts think on a fundementally different level. Introverts internalize their experience and use others to validate/criticize it. Extroverts externalize their experience and let others create it for them.

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