-  [WT]  [PS]  [Home] [Manage]

  1.   (new thread)
  2.   Help
  3. (for post and file deletion)
/sci/ - Science, Technology, Engineering, and Mathematics

Join us in IRC!

•This is not /b/ or /halp/. Tech support has its own board.
•If you are not contributing directly to a thread, sage your post.
•Keep the flaming at a minimum.
•Tripcodes⁄Namefags are not only tolerated here, they are encouraged.
•We are here to discuss sci-tech, not pseudoscience. Do not post off-topic.

•♥ Integris

  • Supported file types are: GIF, JPG, PNG, WEBM
  • Maximum file size allowed is 5120 KB.
  • Images greater than 200x200 pixels will be thumbnailed.
  • Currently 473 unique user posts. View catalog

  • Blotter updated: 2011-01-12 Show/Hide Show All

There's a new /777/ up, it's /Trump/ - Make America Great Again! Check it out. Suggest new /777/s here.

Movies & TV 24/7 via Channel7: Web Player, .m3u file. Music via Radio7: Web Player, .m3u file.

WebM is now available sitewide! Please check this thread for more info.

New Textbook/Book Request Thread deadbabies ## Mod ## 13/08/25(Sun)06:03 No. 15270 ID: f34135 [Reply] Stickied

File 137740339172.jpg - (401.45KB , 1680x1050 , titanfalsecolor.jpg )

First off, hello there, I'm deadbabies, and I will be taking over as /sci/ moderator. Rules will remain the same. Please use the report function if you see posts that violate the rules, but also do not abuse it.

I have officially expanded the scope of /sci/ a bit. You may discuss Science, Technology, Engineering, and Mathematics here now. No science is discriminated against as long as it's of the peer-reviewed variety. If someone wants to discuss Anthropology or Social Science, by all means, let them. If you do not like it, just don't post in the thread.

The IRC channel #/sci/ is now (finally) re-registered and I am running as operator on here. Feel free to stop by and say hi. I do leave my computer idling on IRC, so check back or leave me a message if you have any ideas, suggestions, or just want to tell me off. You can get onto #/sci/ by joining the server irc.7chan.org at port 6667. You can also use SSL at port 6697 but you will have to set your client to accept invalid certificates.

ADDITIONALLY and IMPORTANTLY I have had several requests on IRC regarding the old Ebook FTP that we used to have. Unfortunately, the mod who ran it entered the military and no longer runs or maintains it. I have no plans to make another one, but if one of you guys would like to, by all means advertise here.

That being said, I'm just going to leave this link here:


You may find what you seek here.

I will be unstickying the old ebook/source articles thread. Please post any new ebooks/source articles here, and feel free to post any working links from the old thread there; I will eventually be deleting it.
Message too long. Click here to view the full text.

14 posts and 2 images omitted. Click Reply to view.
Solutions Manual to E&M, 3rd Edition by Purcell Anonymous 16/11/19(Sat)00:05 No. 16384 ID: 1ae570

File 147951030462.jpg - (27.55KB , 406x500 , Purcell 3rd Edition.jpg )

Looking for the the solutions manual to Electricity and Magnetism, 3rd edition by Purcell and Morin. The problems are much more difficult and numerous than in the previous two editions, making it one of the best problem books on the subject. Was able to find the solutions to two analogous books in Classical Mechanics:



Sadly, all my searches for the solutions to the E&M book have been fruitless. It's the last manual that I need to complete my collection.

Anonymous 17/03/19(Sun)10:00 No. 16472 ID: 239da7 [Reply]

File 148991401746.png - (112.72KB , 925x301 , Worldlines.png )

So, I have a question regarding physics and mathematics. Between the two, which would give me more "smart sounding shit." I don't mean learning it to brag, I mean stuff like pure mathematics sounding totally abstract to normal people. I just want to be in a different world basically. Kind of like induced autism? Or like a constant high but without drugs. Pic unrelated

7 posts and 1 image omitted. Click Reply to view.
Anonymous 17/05/11(Thu)07:29 No. 16499 ID: 58ed95

When both physics and math get higher it's all written, so neither "sound" abstract.

This was done so mathamitions and physicists would be forced to talk about something else at cocktail parties.

Anonymous 17/05/23(Tue)10:56 No. 16505 ID: cb2135

This is such stupid shit, if you learn a lot of stuff you'll want people you can talk with about it, not to deliberately _not_ be able to talk about it.

Americium 17/05/25(Thu)21:29 No. 16510 ID: 87c258

Meh, fuck it.

Read this, and all of STEM will be within your grasp.

'Physics, Topology, Logic and Computation: A Rosetta Stone', John C. Baez, Mike Stay

Anonymous 17/05/05(Fri)06:24 No. 16495 ID: 97b52b [Reply]

File 149395827559.jpg - (71.66KB , 289x317 , Ungus Fungus.jpg )

Why does the frequency of a wave multiplied by its wavelength equal C?

2 posts omitted. Click Reply to view.
Anonymous 17/05/14(Sun)23:18 No. 16502 ID: 9e6a0a

Because the wavelength is c divided by the frequency.

Anonymous 17/05/24(Wed)14:41 No. 16506 ID: ca3ad7

Same reason the speed of a car driving in a sine wave will be its frequency multiplied by its amplitude.

You're basically just asking "why does EM radiation move at the speed of light". To which the answer is: "it just does".

Anonymous 17/05/25(Thu)05:01 No. 16507 ID: 5465dc

You're multiplying a rate (/s) by a distance (m) so you get a speed, m/s.

/cyb/erpunk general Anonymous 17/05/04(Thu)19:59 No. 16494 ID: b47205 [Reply]

File 149392075238.jpg - (1.96MB , 1760x2332 , creepy_chan_nosebleed_by_catman103.jpg )

Nosebleed Edition

What is Cyberpunk?
It's complicated.


Cyberpunk Communities
Message too long. Click here to view the full text.

Anonymous 17/05/17(Wed)02:30 No. 16503 ID: a58ad4

Cyberpunk died when people started fetishizing dystopia. You all understand that cyberpunk is supposed to be a resistance movement, right? Now people are basically welcoming economic disparity and invasive surveillance with open arms. It's fucked.

Anonymous 17/05/18(Thu)02:23 No. 16504 ID: cfee17

Cyberpunk died as a genre of fiction when it just because reality.

Logic is the 0-truncation of n-Category Theory. Americium 16/11/20(Sun)05:20 No. 16385 ID: ed8b6e [Reply]

File 147961565686.png - (75.30KB , 500x562 , true_false_paradox.png )

Let's see you normies try to logic your way out of this one.

6 posts and 1 image omitted. Click Reply to view.
Anonymous 17/03/28(Tue)22:05 No. 16477 ID: ae8d22

True: Neither option can answer this question as it requires a yes or no answer. It is true that any answer I give is false, .'. the most fitting answer is true.

Anonymous 17/05/12(Fri)15:19 No. 16500 ID: ae6f04


Anonymous 17/05/12(Fri)15:19 No. 16501 ID: ae6f04


HELP!! Anonymous 17/05/01(Mon)00:01 No. 16490 ID: e202d0 [Reply]

File 149358971341.png - (34.32KB , 769x733 , 1479011986675.png )

Can someone explain a quadratic equation in a way that makes it more intuitively understandable? My algebra teacher just rambles endlessly about unrelated shit.

Anonymous 17/05/01(Mon)01:02 No. 16491 ID: 64fdd2

shit's basic math bruh but your time would be better spent going to khan academy

Anonymous 17/05/02(Tue)07:52 No. 16493 ID: 9e6a0a

A quadratic equation is an equation that can be rewritten into the canonical form

0 = a*x^2 + b*x + c

where a, b, and c are specific constants and x is a free variable. A quadratic equation has at most two solutions (a solution is a value of x that makes the equation true) in the real set, but it may have one or no real solutions.

Any quadratic equation in the canonical form can be solved using the quadratic formula:

-b + (+/-square_root(b^2 - 4*a*c) / (2*a))

Note: if b^2 - 4*a*c < 0, then the equation has no real solutions. If it's zero then it has a single real solution. Otherwise it has two real solutions, given by the positive and negative square root.

So, Pluto isn't a planet. Anonymous 15/07/25(Sat)21:37 No. 16177 ID: b3adbb [Reply]

File 143785303060.jpg - (79.57KB , 1024x1024 , lor_0299148119_0x632_sci_3.jpg )

I've got news for your son.

That or its really good CGI and NASA has pocked our billions of dollars.

Anonymous 17/05/01(Mon)03:44 No. 16492 ID: 9c4b9c

Looks like a planet to me.

Really Anonymous 17/04/06(Thu)10:17 No. 16482 ID: 55153b [Reply]

File 149146667596.png - (194.21KB , 538x425 , Thruster4.png )

I just wanted to make cool simulations and maybe invent something I dont know

So I downloaded Openfoam and apparently you need to be a master computer scientist just to be able to even start the program? How can I make things like pic related but easier?

Anonymous 17/04/22(Sat)00:03 No. 16487 ID: 643b6c

blender can do fluidsimulations, fogsimulations, flamesimulations.

Anonymous 17/05/25(Thu)05:04 No. 16508 ID: 5465dc

SketchUp will let you easily build models. Pretty sure you can import them into better simulators.

Future invention timeline Max 17/04/16(Sun)05:07 No. 16486 ID: 11e346 [Reply]

File 149231207185.png - (148.60KB , 300x400 , TARDIS2.png )

Can someone help me create a timeline from 2017-2050, with each year having one future invention? One invention per year, from now until 2050. You don't have to explain how it works; just be creative.

Anonymous 17/02/08(Wed)13:57 No. 16453 ID: eb6b3b [Reply]

File 148655865765.png - (1.41MB , 1873x735 , pol disinfoagent1673875092y329.png )

The Vaccination of little Tommy Autistic.

When Tommy was a wee little lad at 4 years old, his mommy took him to a tax payer funded doctor's office to get a "booster shot." Little Tommy had no idea what a booster shot was, but he went in excitedly, mostly just because the waiting center had a little play area for him and other kids to play with blocks and such. It was then, when doctor told Tommy's mommy that it was time for Tommy to get his first booster shot! As Tommy sat down on the white papered bed, the doctor approached him with a big scary needle. OUCH! The needle pricked Tommy in the arm, and Tommy could not stop crying. The needle hurt Tommy, and Tommy had no idea why his mommy would let Tommy get hurt by this strange doctor. You see Tommy's mommy was a feminist in the 1960's who took part in the "revolution" for "female rights." She used to be what people would call, a "hippie," but after all her youth experimenting with various drugs, she decided to take her chruch's big business funded AA program's advice, and settle down and have a kid, in order to put her life back together. While she was in school, she "learned" that "vaccines eradicated disease" because they are "disabled" virus DNA that serve as target practice for the immune system's anti-bodies, so that way the immune system would be extra ready when a "live and active" version of the virus came around. She read in her government funded biology book how a Jewish doctor, Edward Jenner, "figured" this all out because his milk maidens, who were regularly exposed to cowpox, were relatively immune, so he created a concoction out of small pox pus, which contained the remnants of the disease, and inserted the pus into people's blood streams! It was all so sciency and believable to Tommy's mommy! After all, why would she be going to school if all this stuff was not true? Tommy's Mommy's also learned about diseases like polio and rhuebella, and tetanus, and measles oh my!

7 posts omitted. Click Reply to view.
Anonymous 17/04/11(Tue)14:56 No. 16484 ID: f1c74b

Oh please kill yourself OP

Anonymous 17/04/15(Sat)09:25 No. 16485 ID: 62b17e

u mad cause you autistic

Sage Anonymous 17/05/25(Thu)05:07 No. 16509 ID: 5465dc


Mercury hasn't been used in decades.

Delete post []
Report post