Archived threads in /sci/ - Science & Math - 634. page
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Is time travel possible, if so what would the rules most likely be?
First rule of time club is; you don't talk about time club.
>>7649319
What I went back in time and changed the rules?
sleep tight nigger
Hey /sci/borgs, how do you take notes? Specifically, do you have a short hand for written notes? And how did you develop your short hand to be the most efficient?
No, I just write slightly less legible. Then again I don't have any maths classes atm, those really used to fuck up my hand.
>>7649013
>Hey /sci/borgs, how do you take notes?
day to day notes are scribbled down into what i call my "barf book". at the end of the week, i consolidate and rewrite into a different book, which is my master studying resource that i take with me everywhere.
I tend to write notes in the margins of my books, provided what i'm taking notes for follows said book reasonably tight. I then compile those notes before an exam.
So guys, can atoms be divided in a naturally way?
Yes. Black holes regularly split atoms. Prove me wrong.
ever heard of atomic plants? define "natural"
Yes, many heavier elements have a chance to spontaneously fission. There's also alpha decay of course.
What's the worst machine? Worst as in, the most inefficient, unreliable, or needs to be repaired the most often.
The two-stroke engine.
>>7647915
Most human brains.
>>7647915
ur mums semen chute
ITT we fix this image.
>almost no algebra
>no combinatorics
>no set theory or logic
>no geometry
>no numerical analysis
>only a little topology
It's basically a syllabus fast track for analysis.
Let's make an actual syllabus for someone to go from Khan Academy to having the knowledge of an Undergrad in General Math from MiT all without having to set foot...
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This is the path to an undergrad in general math from MIT. Beyond an introduction, topics in algebra and modern geometry are too advanced for undergraduates on the standard track. What is posted here is consistent with what an undergraduate math education would look like. At MIT, algebra is required, but once again it is merely an introduction, and the rest of what you listed are electives or seminars.
What if this 'updated' version included course numbers for MIT open courseware, since that school is being used as an example?
>>7647454
OCW is lacking in a lot, if not most of it's courses. The amount of good MIT OCW programs I can count one hand.
Is it even possible to build a sci-fi-esque reusable space ship that can take off from Earth, fly to another planet, then take off again and return to Earth in one piece using only proven physics, and near term technology?
It's fun to think about but I don't think any combination of existing systems could do this.
If the EmDrive is true, maybe.
If the EmDrive is BS, definitely not.
I think it's certainly possible. The only real obstacle is Delta-V, and that could be improved drastically with more efficient engines (which are at least theoretically possible with current technology). Even an Orion drive might be able to do it, if you could somehow find a place that you'd be allowed to take off from.
>>7646770
>proven physics
yes
>near term technology
how far is fusion? you tell me
It's all about energy&power density f a m.
Have you been to (m)any conferences, /sci/? Which ones? Did your school pay for it?
>fancy hotels
>dress up nice
>open bar
>getting drunk
>poster hungover
>have regrettable sex
>get drunk again
Conferences are the best.
no, Im genetically attractive enough to attend college parties and have fun that way instead
>>7645445
I don't understand why you can't do both? If flying out to a fancy hotel for the weekend with a bunch of friends on your uni's dollar doesn't sound like a good time to you, then you must be a really boring person.
Went to a siemans fire alarm technology expo a few years ago.
The only women in fire alarm are secretaries, dikes and HR.
But i did smoke a joint in the hotel bathroom with the president of the company.
Beautiful equations thread
>>7645099
So how does one derive that formula?
>>7645109
That's the beauty of it.
How to check if this is correct? Who derived it?
Are there any devices available that prevent AC from feeding back into a line after a device is turned on / off, etc?
I know very little about electricity. My mother is concerned that ripple in the otherwise (relatively) smooth 60 hz sine wave is interfering with her sleep and general health. I don't really have much of an opinion, I'd imagine it's probably emitting radio waves in a general band that's fairly small. Not certain what a given magnetic field flux and field strength would do, and my own health is so trashed to begin with, I don't...
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>>7643625
Buy her a tinfoil hat.
>>7643649
this
also sew her a blanket/sheet/pillowase set out of brass mesh and ground it to make a faraday cage to keep those pesky electromagnetic ripples out.
Shameless self bump.
![SEP_Airlock_Concept[1].jpg](https://i.imgur.com/9LfkCW3.jpg "SEP_Airlock_Concept[1].jpg")
Will asteroid mining be our next big achievement in space?
no the cost of sending people out is to high. the oxygen needed alone to go to the astroid belt and hang out for 6 months and come back is beyond all the space programs of earth put together to store up and put in space in 1 year
and most western nations have wing nuts like stephen hawking who fear monger about ai so no probe bots doing all the work either
also the cost for anything mined would be many times the normal rates and wouldnt sell
>>7640413
>20-40k$ per kilogram of payload transfered into low earth orbit
>asteroid mining
yeah dude it'll be totally worth it
>>7640454
Yeah, that's always my question re: this subject. WTF could you possible plan to mine that would make this anything resembling cost effective? Reminds me of bitcoin mining at this point.
What would be a fair price for this telescope?
1/4
>>7652393
https://www.youtube.com/watch?v=u5HOt0ZOcYk
Anybody got the solutions manual to Oliver Davis Johns's Analytical Mechanics for Relativity and Quantum Mechanics? The book says the solution manual is free on request, but only for instructors... and I'm not an instructor. Tried requesting (twice) waited a month (twice) and didn't get a reply,
http://global.oup.com/uk/academic/physics/admin/solutions
Well maybe if you aren't an instructor you shouldn't have a solutions manual
>>7652346
Still, it would be incredibly helpful whenever I get stuck.
>>7652349
well maybe if you got stuck, you'd actually learn the material.
So today I found out something pretty interesting. Branching from the new-found proof of water on Mars, it was actually discovered that a hypothetical element 119 (Was called Ununennium before its discovery) could be found on Mars. Because of the lack of Oxygen on the planet, this element can remain on the planet. It falls under the Alkaline metals category under the periodic table. Like Francium, it reacts very violently to water, except it's speculated that the effects would be 8.6x higher than that of Fr. I can't wait to learn more about this newfound element! (An attachment below shows its place on the periodic table of the elements)
>>7652191
I don't understand.
Does the reaction of Fr and water lead to fission or fusion of Fr into some other element?
Reaction of Li with water gives LiOH and 0.5 equiv of H2 - but doesn't transmute Li into another element.
No, this element wasn't created, or anything. Small amounts of it were found on the planet.
How does one "hypothesise" about elements? How do you guess if an element exists?
Does this method find all possible elements or are there some we still might be unaware of?
How do I understand a math textbook? Every time I try to read this Calculus textbook its a huge whatthefuck. I feel really stupid. I'm trying to teach myself Calculus. Anybody know how I can do that? I got an A in Pre-Calc.
You have to
>make sure you understand algebra and trig inside and out
>make sure you have a book that doesn't just suck shit
>It's math. It's only fair that you have to think a bit, isn't it?
My Calc III professor recommends Salas and Hille's Calculus. I'm using Swokowski's Calculus, and it isn't terrible.
>>7652072
if you had to take pre-calc i'm sorry but there likely isn't hope for you having a chance at an easy understanding
it's just the truth
>>7652112
This. It's either trig or precalc for your prereq in my state.
Everyone in my first Calc class who took precalc spent the semester in extremely loud agony.
Trig is a very nice opportunity to pick up important knowledge AND important skills. It ties together the entirety of your math education up to that point.
Precalc tells you what a logarithm is.
This is the logo of my Favorite bar.
Its been bothering me though that I can't figure out what atom it would represent.
Two electron orbits. 2 electrons on one, and 6 on the other.
Can any of you help me figure out what atom this most likely represents?
>six on the other
count again
also Fluorine.
Enjoy your extra credit in your high school chem class
>>7651661
false. it doesnt represent any atom
fluorine is somewhat the closest but has electron configuration [math]1s^22s^22p^5 [/math]
>>7651670
yeah, and the nucleus is an olive. everyone knows nuclei are made of grapes
