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

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Anonymous 17/03/11(Sat)01:19 No. 16469 ID: 57133f [Reply]

File 14891915467.gif - (17.29KB , 300x100 , 78.gif )

Alright /sci/, it's Goldbach proof time.

Who here can count to 112. All the way to that number. Congratulations. You are an abstract scientist.

The proof is that by itself and without other numbers the natural numbers do not exist.

Fast Oohplah 17/02/01(Wed)17:28 No. 16447 ID: 4318e8 [Reply]

File 148596651718.png - (53.70KB , 506x200 , Audacity_Logo_With_Name.png )

Hey /sci/, how fast would an object need to travel in a circle to look like one solid ring or object. Like if a red ball span so fast it just looked like a solid red ring, not moving at all. How fast is that?

>pic unrelated

1 post omitted. Click Reply to view.
Fogel Fry 17/02/01(Wed)23:23 No. 16449 ID: 6d05e5

Just for strictly non-serious reasons: How fast needs the red ball to travel to dupe the human eye and what would this do to the material the ball is made of?

Coming to that: What material needs the red ball to be made of?

Anonymous 17/02/02(Thu)00:40 No. 16450 ID: 8b2816

It depends on the sort of light that shines on the object. For example, strobe lights are used to visually inspect propellers as they spin in water. If you can time a light to shine very briefly at the same frequency as the object orbits, it will appear to be at a standstill in it regular, non-ring-like form.

Assuming a constant light source, such as the sun, and that the observer is not moving their eyes (because fast-moving objects are visible during saccadic motion), an orbit of a few centimeters in radius would appear as a solid ring rather easily. I would guess at less than 200 Hz (<12 kRPM). Roughly speaking, the larger the radius, the faster it must spin; more specifically, the tangential velocity must stay the same. Additionally, if the orbit is looked at from the side, the object will appear to move slower when it's on the far side of the orbit, so it will need to move even faster than if the orbit is looked at from the axis of rotation. The crucial factor here is how quickly the object traverses the field of view of the observer.

Anonymous 17/03/07(Tue)20:01 No. 16468 ID: 68162d

Fuck idonno

PedoFinderGeneral pedospotter 16/08/17(Wed)09:10 No. 16351 ID: e75e2a [Reply]

File 147141784023.jpg - (2.43KB , 135x90 , magic.jpg )

shouldn't all pedos go jail soon?


dont pedos ever wonder how come
other pedos know all about them
despite they all use winrar?

that its strange they break
eachothers security with
the most basic knowledge

do you think pedos will
ever realise its not really
scientifically accurate
Message too long. Click here to view the full text.

Anonymous 17/01/25(Wed)19:31 No. 16436 ID: 3bc715

Never met a kiddy pickle tickler myself, but from what I can gather, some of them get caught due to extreme arrogance.
(i.e: "Those policemen won't get me, I USE A LIBRARY COMPUTER!")

Anonymous 17/03/07(Tue)20:00 No. 16467 ID: 68162d


Anonymous 17/01/30(Mon)01:55 No. 16444 ID: b46211 [Reply]

File 148573774380.jpg - (7.25KB , 300x168 , images.jpg )

Hello there /sci/. I have a challenge for you. Take your favorite futuristic or otherwise out of reach tech from any movie (let's say a light saber) and try to explain if humans can replicate it with a few modifications.

Anonymous 17/03/05(Sun)03:26 No. 16465 ID: 9c4b9c

lightsabers contain crystals.

Anonymous 17/02/26(Sun)19:45 No. 16463 ID: ff4681 [Reply]

File 14881347566.jpg - (53.95KB , 374x339 , BAA09_16_brain_bio-chip.jpg )

so, I know you guys use word filters, or at least have a times, I have some questions about them, now, this being said, I'm aware that your guys' word filter isn't exactly used in the same way that this kind is... at least in spirit, or cause behind the technicalities

out of curiousity, does anyone know of any studies on manipulation of perception in a pervasive way involving mediums of communication and what is said or isn't said?
does anyone have any knowledge of studies involving methods of control that are linguistics oriented or say... are designed to pick up on related contexts and the like with various signifiers?

some stuff's popped up lately and I'm *extremely* interested in this, I might have to learn a fair bit of technical jargon and concepts but I feel like it's probably worth it

on the one hand it seems like the attempts to engage in this are laughable but at the same time I know that sometimes these sorts of things can get real good real fast, especially when there's already a load of collected data that's not purposefully spoiled to challenge the attempt at deriving context to start silencing apparently said things

Anonymous 17/02/27(Mon)02:10 No. 16464 ID: ef54e2


/sci/ , " TEACHING IS HARD , NO WAY , ! " , better than India , Anonymous 17/02/18(Sat)06:43 No. 16459 ID: 89bc45 [Reply]

File 148739659977.png - (27.16KB , 398x107 , Screen Shot 2017-02-17 at 10_50_53 PM.png )

" You can be a teacher in an inner city school , especially in The United States Of America , as a The United States Of American , that is far easier than being a Cracker Barrel Manager , in india , . " , what reason do you people let indians touch any education that is not proper hygiene and basic road construction , ?

BEEN OVER 2,000 YEARS /sci/ , AND INDIANS STILL NOT ALL BATHED , ! Anonymous 17/02/18(Sat)06:58 No. 16460 ID: a710e1

File 148739752894.png - (310.86KB , 808x999 , Screen Shot 2017-02-17 at 11_06_44 PM.png )


Microsoft Edge Anonymous 16/11/08(Tue)04:49 No. 16376 ID: 57a468 [Reply]

File 147857694543.jpg - (35.31KB , 900x450 , Fight-on-Between-Opera-Software-and-Microsoft-Edge.jpg )

Serious opinions about this new browser?

And I want honest opinions and not those entirely based upon the fact that a past iteration of the engine was not good. Like all things, they can improve or get worse.

Anonymous 16/12/15(Thu)13:00 No. 16399 ID: 75c683

It's garbage.

Anonymous 17/01/18(Wed)18:33 No. 16420 ID: 3bc715

It's trying entirely way too hard to be 'good', also it spawned an endless cascade of edge jokes, and I am not fine with that.

replacing speaker with 1/4" jack chrissychris 16/12/19(Mon)21:09 No. 16401 ID: 8ed2cc [Reply]

File 148217815616.jpg - (110.29KB , 1000x1000 , 7chan post photo.jpg )

Alrighty, I am looking for some help.

For the sake of experimentation and fun, I'd like to replace the speaker of a shitty kids toy (very similar to the one in the pic) with a 1/4" audio jack so it can play through a larger amp, possibly even through guitar effect pedals.

I've already tried this twice. Taken apart the toy, soldered in a 1/4" jack, and plugged it in. Both times I ended up with a reallyyyy spotty and quiet sound. At first I thought it may be a bad soldering job, but now I feel like it could be due to the low power of the toy, it takes 3 AA batteries.

So what's the deal here? Any ideas what could be wrong?

Anonymous 17/01/01(Sun)23:02 No. 16405 ID: 67f38c

It has nothing to do with the electrical power. Real electric guitars don't have any batteries. The issue could be that the amp is designed to work with the signals from a guitar's pickup, which are probably not the same as the signals from a speaker. If I had to guess, the pickup would be taking the signals from each string individually, while the speaker from this kid's toy is taking the entire sound as a whole.

It's also possible that the teeny-tiny magnet in that speaker just isn't strong enough to send a strong signal. I'm not sure what you could do about this.

Cool little Simulator CometCrazy 16/12/27(Tue)01:31 No. 16402 ID: ec6349 [Reply]

File 148279866422.jpg - (45.39KB , 1271x601 , CometCrazy.jpg )

Check out this cool simulator

watch as the snowman comes back to life jsnap 16/11/29(Tue)02:28 No. 16393 ID: 2af0d7 [Reply]


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