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Archived threads in /sci/ - Science & Math - 1583. page

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Why distant objects looks smaller? Can you answer that /sci/?
36 posts and 8 images submitted.
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>>8161197
this is one of the unsolved problems in physics
>>
>>8161197
why do we have 3d vision when we only have 2d images
>>
>>8161197
>He doesn't have orthographic vision

lol git gud scrub.

Any engineers in here?
What software do you use for robotics simulations?
12 posts and 2 images submitted.
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>>8161189
ROS
matlab
>>
simulink
>>
>>8161191
>>8161193

/thread

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Can neutrons be isolated and accumulated? How would a glass full of neutrons look like?
34 posts and 7 images submitted.
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yup, neutron stars are huge spheres made of neutrons.
>>
neutron is a meme
>>
The answer is yes, though you should be reminded that neutrons decay and have a half-life of about 11 minutes.

It's possible to slow neutrons down from some source (usually produced by an accelerator) and trap them magnetically. There's no way to make them as dense as you're imagining though. A cold neutron gas that lasts less than an hour is the absolute best we can do.

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Easy problem solving thread

You are playing a game of Russian roulette where you load two bullets into consecutive chambers of a six shooter. Your mate pulls the trigger and it clicks, he is okay.

Do you pull the trigger again or do you spin it first?
28 posts and 2 images submitted.
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I put the gun down and concede defeat
>>
3/4 chance of not blowing your brains out without spinning, or 1/3rd with spinning. Obviously better without spinning.
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>>8160961
Neither, you shouldn't play Russian roulette.

Pulling the trigger first seems more practical though.

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Thinking about demonstrating the use of a separatory funnel for a class thing (speech class, not a chemistry class). Is there any combination of classroom-friendly solvents and solutes that will produce a nice visible result? Ideally I'd like two visually distinct phases, and a compound that will noticeably change the appearance of the phases during the extraction. I just can't think of anything offhand that will do the trick without involving some kind of gnarly organic solvents, toxic/expensive colored compounds, strong acids/bases, etc. Again, this is for a non-lab, classroom setting.

Any ideas would be really swell.
31 posts and 3 images submitted.
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OP here. Would cooking oil be an option? Oil would definitely give me the visually distinct phases I'm looking for. Not sure about what my solute would be though. Also, this will be a borrowed sep funnel, so I can't gunk it up too badly.
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>>8160949
Just give a speech on why it is ok to own pit bulls or some MMA fighter like everyone else in your class, you nerd. You're just going to confuse everyone and be cringeworthy.
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>>8160966
The speech has to involve a practical demonstration. That's the whole point of it. Most of the practical skills I have are from chemistry class. Also, extractions are probably the most intuitive and interesting thing I could show them, especially when you can literally see the stuff moving from one phase to another!

It's a fair point, though. If this falls through I'll show them how to iron a shirt.

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Are bionicles scientifically possible in real life? As in like how they are in the movies?
15 posts and 2 images submitted.
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are you fucking 11 m8
>>
>>8160902
bionicles were amazing. what a sick background story.
>are they possible in real life
kek
>>
>>8160909
11 inches down your throat m8

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CS or EE?

which one will let me help poor people and help develop my poor thirld world nation faster?

Or can I do both?
11 posts and 1 images submitted.
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can we have an education general ? We seem to have a lot of questions like these

I'm kinda with you though man. CS is dope, EE is dopest. But, doubling on them would require you to be some kind of genius.
>>
>>8160890
>college math is hard
>half the degree are meme humanities optional courses
>only 20 courses are core subject
>hard
>>
>>8160894
nigger, double major EE and CS and show me your grades. It's not crazy hard math, but the work will be to much.

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ITT: Tell OP why he's fucking retarded

>Space-time is curved
>In some places, it's infinitely curved
>These areas are what's known as black holes
>To an observer far enough away from a black holes influence, one appears the relative focal point
>The relative focal point as seen from the center of a black hole differs dramatically
>Any amount of space away from them, the observer actually perceives a relative difference in time, limited by the speed at which information can travel
>To us, and our relative frame of reference here on earth, far distant galaxies appear far older
>To someone on the edge of an event horizon, we would appear far older
>Information cannot physically travel to or from either observer about the state of the other.
13 posts and 4 images submitted.
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>>8160781
>In some places, it's infinitely curved

Until now I thought anything smaller than Planck length suddenly didn't make any sense - time and space drop entirely there.
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>>8160819
Doesn't the asymptotic behavior imply infinity tho?
>>
>>8160834
>imply
It shouldn't be about implication, it should be about proof.

https://www.youtube.com/watch?v=-SRhuQji2nw

Real "reusable" rockets LOL

Leave space to the professionals.
25 posts and 2 images submitted.
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>>8160692
He should go with this virus design.
It can land on most surfaces if the wires strong enough...
Even better.
Put dirt on the boat for a softer landing
put spikes on the ship.
Just one long spike. Or lotsa little ones.
Dart the ship into the boat like a spike.
>>
last rocket ran out of liquid Oxygen a few feet above the deck.

He still has 2 used rockets to sell at a discount. 1 rocket to go in front of SpaceX HQ. 1 rocket to be studied.
>>
>>8160692
like NASA or the USSR? the ones who blew up hundreds of rockets when trying to do something never attempted in human history?

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I really don't know how to ask this without it sounding like a conspiracy theory, but how come the possibility of intelligent life once living on Mars is never discussed in the scientific community? We're constantly finding out new things about the planet and it's already believed that the planet was once similar to Earth anyway. I'm not a big science head, so would this be literally impossible or is it possible but unlikely?
15 posts and 4 images submitted.
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Of course it's possible. People will tell you it's not if this thread gets any more replies, but you have to remember, these are people from a sub-Type 1 civilization who reached their conclusions about where life can and cannot occur in the universe based on observing only a small percentage of the organisms that have ever existed on only one single planet.
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>>8160534
Further evidence for the conclusion that the life wasn't just basic?
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>>8160626
thanks anon, great perspective
>>8160634
True, but aren't we already assuming that there is life on some of the Kepler planets based on the fact that they are similar to Earth? If Mars was also like that at one point I don't see how it's so far fetched.

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Does anyone know how to make acid that can melt shit?
46 posts and 1 images submitted.
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>>8160523
Concentrated bleach + Concentrated Hydrogen Peroxide.

Mixing them will make hydromethoxycarboxyl acid, which doesn't give off poisonous fumes and will melt stuff like a Dali painting.
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>>8160523
You can buy it at some stores. You don't have to manufacture it.
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>>8160532
mechanism or gtfo

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For how long should I stay awake in order to die of sleep deprivation?

I've seen instances of people dying from only staying awake for 36 hours while others have succesfully kept going for multiple days. What's the secret?

[spoiler]And If I woke up pretty early this morning and want to stay up to see the Brexit results will I die?[/spoiler]
11 posts and 2 images submitted.
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>>8160513
>I've seen instances of people dying from only staying awake for 36 hours

I don't believe this, can you give a source?
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>>8160515
http://www.huffingtonpost.com/2012/07/18/diablo-3-death-chuang-taiwan-_n_1683036.html

Excuse the shit source, it was the first link I found about the story.

Turns out I was off by 4 hours but the point stands.
>>
I had problems with insomnia in my late teenager years. I spent about 44 hours awake, and I didn't die AFAIK.

It's not something I would recommend tho. Things start getting pretty weird after about 24 hours. It starts to feel like real life is a movie you are merely watching.

Are there a benefit of consuming cannabis and his derivatives? Like oils and stuff
11 posts and 2 images submitted.
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>>8160403
1. You get stoned.
2. If you get stoned enough you'll become stupid enough to believe that cannabis cures all diseases.
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>>8160405
Dont forget:

3. You get stoned.
>>
It is better than anything else you would take to to salve a hangover.

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Dear /sci/,

Suppose that I've created an algorithm that will optimize an arbitrary small sequence of binary data (up to 1kb). This binary data can represent anything you want, from computer instructions, to DNA, to physical objects. The algorithm will recommend a sequence of bits which you then evaluate with a simulation technique of your choosing, and then you tell the algorithm how "good" of a suggestion that piece of data was. Based on your ratings of the different suggested data sequences, the algorithm will suggest a "better" sequence of data.

What are some interesting problems in your field of study that could make use of this sort of optimization? I'm looking for intriguing applications where the algorithm will basically design an optimal solution to your problem.


Thanks,
Anon Y. Mous
18 posts and 2 images submitted.
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>>8160383
It is called supervised learning, dipshit.
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>>8160470
That's not even remotely what this is. This is a global black box optimization technique for binary data. I'm publishing a paper about it, but I want to present some more applications.
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>>8160383
Find the best pick-up line.

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If cosmological redshift determines that a emitted photon will have a higher frequency than after it propagates for awhile, doesn't the planck relation tell us that the photon has lost energy? Where does this energy go?

I feel like there is a really obvious answer but I can't think of it....
29 posts and 2 images submitted.
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Potential Energy
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>>8160295
Learn what frequency means first.
>>
Photons can travel through space without losing energy. Red shifted light looks that way because it's traveling away from you so the light waves 'stretch' out. It's not until that photon hits something that it gets absorbed

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