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/sci/ - Science, Technology, Engineering, and Mathematics

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World's Simplest Electric Train Jeson 14/12/23(Tue)20:30 No. 16007 ID: 3791e5 [Reply]

File 141936303681.png - (512.38KB , 1459x468 , baterija.png )

The trick in the video is that the magnets are made of a conducting material and they connect the battery terminals to the copper wire, so the battery, magnets and copper wire make a circuit that generates a magnet field just in the vicinity of the battery. The geometry means the two magnets are automatically at the ends of the generated magnetic field, where the field is divergent, so a force is exerted on the magnets.

The magnets have been carefully aligned so the force on both magnets points in the same direction, and the result is that the magnets and battery move. But as they move, the magnetic field moves with them and you get a constant motion.

If you flipped round the two magnets at the ends of the battery the battery and magnets would move in the reverse direction. If you flipped only one magnet the two magnets would then be pulling/pushing in opposite directions and the battery wouldn't move.

What you need:
1. Neodyum magnets
2. Dry cell battery
3. Copper wire

World's Simplest Electric Train Jeson 14/12/23(Tue)20:38 No. 16008 ID: 3791e5


Seen this kickstarter, looks interesting... Anonymous 14/12/18(Thu)13:04 No. 16003 ID: 868e7f [Reply]

Youtube  A computer vision program:


Trying the demo version now

Anonymous 14/12/09(Tue)18:17 No. 15996 ID: fc1128 [Reply]

File 141814543148.jpg - (38.28KB , 549x673 , motizuki.jpg )

Are you ready for “Inter-universal Mellin transform”?


Remark 2.2.1

Mochizuki hopes to solve the Riemann Hypothesis too

Anonymous 14/12/16(Tue)03:56 No. 15998 ID: f6b29d

File 141869861769.jpg - (17.82KB , 300x375 , 1286043555673.jpg )


Anonymous 14/12/05(Fri)02:52 No. 15993 ID: 86e709 [Reply]

File 141774435457.jpg - (78.83KB , 1000x750 , formlabs-inline.jpg )

Welp, our rapid prototyping machine ist kill.

Time to get a 3D printer to use for moldmaking plugs.

Anyone have experience they'd like to share?

Sifted 14/09/26(Fri)02:55 No. 15892 ID: 96405d [Reply]

File 141169293046.jpg - (43.01KB , 290x399 , J8seKRxKdk6RNCK6ipzejQ2.jpg )

So for everyone out there I ask you what you think the universe would be like if attraction was different. If it was likes attract and opposites repulese, so two positive charges attract same with negative and then a positive and negative repulse. What do you all think?

3 posts omitted. Click Reply to view.
Anonymous 14/11/15(Sat)12:22 No. 15970 ID: c4fc35

My guess would be not much change at all in terms of how the universe works, entropy etc.

But would we exist in it? Probably not.

Effectively you are just switching the masses of electrons and protons. The atomic structure would remain relatively similar except for heavier electrons. Would this cause them to orbit much further from the nucleus? I don't know I'm not a physicist.

But yea, if atoms functioned similarly to how they do now then organic life would be very different. Depending on the properties of the new elements it would likely not be carbon based but rather a more suitable element

Anonymous 14/11/22(Sat)08:38 No. 15977 ID: abc87c

I think this was explored as a mathematical possibility in the early universe when antimatter still outnumbered matter a buttfucktruckload to one, and much weirdness abounded.

I forget what all went down but in short, that shit worked briefly, and then worked itself out. It... went away, OP.

Anonymous 14/12/01(Mon)17:08 No. 15992 ID: 972965

ITT: People not realising OP just asked "What happens if you reverse time"
>Reverse the big bang

Anonymous 14/07/25(Fri)22:51 No. 15766 ID: 86e709 [Reply]

Youtube  Everything I've read about Eugenics has been about how it's pseudoscience. Ok. but, by the sound of it, it was just a selective breeding program. If artificial selection works in every other species, and natural/artificial selection has produced us, ...where's the problem exactly? I have yet to see how a sophisticated selective breeding program couldn't produce a better human body or brain or both. It's what we do every time we pick a mate who we think will make us some primo offspring.

pic semi-related: Just try listening to this without clawing your eyeballs out (why are so many people so fucking retarded and how can we replace them with upgraded models?)

8 posts and 1 image omitted. Click Reply to view.
Anonymous 14/11/25(Tue)16:24 No. 15987 ID: e3615c

I think a better alternative would be like what appears in the movie Gattaca. You take many gamete samples from the future parents and fertilize them in vitro. You keep only the zygotes that meet certain criteria for health (optionally freezing a few in case of miscarriage or some other problem) and you implant one in the mother.

Anonymous 14/11/30(Sun)21:20 No. 15990 ID: 96b946

What about unintended consequences?

Like, for example," Oh hurray! We have bred sickle cell out of existence! But wait oh fuck now everyone is dying of malaria"

Or like how rainman idiot savants are a cunt hair away from being the next Issac Newtons.
Get rid of the retards, get rid of the possibility of greatness.

Anonymous 14/12/01(Mon)04:19 No. 15991 ID: 86e709

The downs side of that would be no greatness, unless, oh shit, a whole generation of autistic savants... because who cares, it eliminates war, and robots and androids unburden us from the shackles of menial tasks and physical labor, agriculture, maintenance, freeing us up to contemplate mathelamatiques and phirosophry and awwt aww day. They can all be sterile, finally uncoupling sex from our reckless primitive approach to reproduction, so people can mate purely for social purposes. Reproduction only happens when intended and it the parents are committed, stable, and financially sound to care for the young, in addition to engineered fetuses cleaner, healthier genomes.

Plus, bonus upside, all cunts can easily be hairless cunts.

Incredible sounds from the Universe collected by the NASA spacecrafts! MagikBit 14/11/27(Thu)22:44 No. 15989 ID: 318e23 [Reply]

File 141712468555.jpg - (5.55KB , 100x100 , bigbang.jpg )

Incredible sounds from the Universe collected by the NASA spacecrafts! They can be listen on:

Anonymous 14/11/22(Sat)00:15 No. 15973 ID: 7fa0bd [Reply]

File 141661174892.jpg - (104.70KB , 640x360 , portal dalek.jpg )


2 posts omitted. Click Reply to view.
Anonymous 14/11/22(Sat)23:44 No. 15980 ID: 5d199c

To me they look like portable life-support/coffins. Picture some 112 year old codger wrinkled up inside one guiding it round akin to a spaz marin dreadnought. That way the expired can enjoy 'normal' life well past their expectancy.

Anonymous 14/11/24(Mon)05:42 No. 15983 ID: c4e26c

So like, a Dalek then.

Anonymous 14/11/26(Wed)20:43 No. 15988 ID: ab4c09


lol ftw.

America VS the metric system Anonymous 11/11/28(Mon)22:57 No. 12847 ID: 2dcfee [Reply] [First 100 posts] [Last 50 posts]

File 132251746298.jpg - (33.63KB , 400x308 , FAT AMERICAN.jpg )

It’s hard to find comedy gold like this, however this is priceless


Apparently a true American tries to show the failures of this evil satanic scientific metric system and fails horribly.

Best parts:

1) Arguing that centimeters are not part of the metric system!
>"Centimeters, while in common usage, are NOT officially recognized metric units"

2) Actually trying to measure something using 0.1 mm obviously not understanding that this precision is not actually possible with human hands.
>"In metric notation this would be 1219.2mm by 2438.4mm."

126 posts and 10 images omitted. Click Reply to view.
Anonymous 14/11/22(Sat)16:27 No. 15979 ID: 287212


Are you saying that 3 meters = 9 feet?

Anonymous 14/11/23(Sun)09:48 No. 15981 ID: d2ef46

Why does this thread still exist. Every time I visit this board, it's on the front page, hosting a series of one retarded comment after another.

Just learn both. You assholes sound like those people who think everyone in the world should only speak one language. It's fucking stupid. Could a mod please lock this thread?

Anonymous 14/11/24(Mon)06:20 No. 15985 ID: c4e26c

The construction industry was the source of the backlash when the U.S. tried converting to metric in the 60s. Muh Two Bah Fer!!!

Well, a 2x4 was a convenient size, a 2x6 or 10 was as well. No one wanted to complicate matters. Forward to today, and lumber mfg's have repeatedly shaved so much material off their finished products, those numbers are nominal only. A 2x4 is actually roughly a 1.5x3.5, precision & tolerances depending on mfg's QC.

So these toothless bearded fags are already using screwey numbers... Running an entire project with tens of thousands of calculations made based on this idiocy, and all the fucking trouble it causes when the new guy builds shit based on the wrong sizes, they can live with, but calling a 2x4 what it actually is, a 4x9, 4cmx9cm, BLOWS THEIR FUCKING MINDS.

Further proof Europe sent its most retarded and stubborn inbred hicks to populate this country.

Anonymous 14/10/19(Sun)11:15 No. 15940 ID: e9758b [Reply]

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How much money you reckon ebola raised for in the name of science? thanks little fella!

3 posts and 1 image omitted. Click Reply to view.
Woo. 14/11/01(Sat)16:07 No. 15959 ID: 2429da

File 141485445093.jpg - (95.39KB , 945x552 , ebola-body-bag.jpg )

Thank you, little buddies! :D

Anonymous 14/11/18(Tue)05:41 No. 15971 ID: a4fae5

>that one laughing nigger in the middle

Anonymous 14/12/26(Fri)12:41 No. 16011 ID: 243dac

I don't see anyone laughing because none of them are.

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