Archived threads in /sci/ - Science & Math - 123. page
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How come we see some people as ugly as fuck, like, why dont we see everyone as beautiful? it would make it much easier to get a mate and reproduce if everyone was sexy or if we didnt see ugliness (does tht make sense), and thats what humans are supposed to do. i guess beauty can be subjective but i dont think anyone will think a really ugly person is good looking, maybe if they can look past the face and into the personality... but r humans supposed to see personality? isn't it ideal to have the most beautiful kids, as arent they the ones who are always naturally athletic and shit?
>>8097997
>How come we see some people as ugly as fuck,
No it's pretty much just you
back in ye olde days before the witchcraft of makeup and personalities and ye newfangled social constructs. beauty ~= correlates with health. which correlates with good living conditions and likelihood of successfully having/rasing kids
Dunno man we are some complex fuckers who breed interspecies. Just watched a documentary about ducks and they are identical and apparently the mating is not based in the physical appearance, this happens in all nature with some preferences for size but we are the only who dont fit in that because we mate in different size, colors and forms.
Sorry if my engrish is shit
I need to get good on spectroscopy theory, particularly vibrational and Raman. Any recommended textbooks?
this is obv not my field
but spectroscopy always gives me major aneurysms
>all that variability
>all that noise
>somehow manage to pull out 99% accuracy of whatever the fuck molecule
how
>>8097965
Autism along with lots of trial and error to develop the theory. Spec is so fucking based though, I get to use an FTIR tomorrow
>>8097994
Any advice on learning it?
If 2 objects approach each other at the same speed ( 75% speed of light ) while they approach each other at the same speed.
What will be the relative speed of one object towards the other?
How fast will they hit each other? at the same speed they were going or will something happen at the point of impact?
What would happen at the impact?
>>8097720
>What will be the relative speed of one object towards the other?
c*tanh( 2 * atanh(.75) ) = .96c
Sorry I don't speak math/physics can you please answer my questions instead?
Google already answered me on how the equation would look like, it still does not make any sense if you don't read physics/math symbols as well as a musician reads music notes.
>>8097736
It's fucking trig and a constant you learned in middle school.
When cooling down a hot room, is it better to point a fan out to get rid of the hot air, or point the fan in to input cold air?
>>8097710
If there's only one channel for the air to flow, they would both accomplish the same thing. You're not creating a vacuum when you turn a fan outside; an equivalent amount of air is coming into the room.
>>8097710
If the fan is low to the ground, in and pointing up
Better to aim it along a wall to get air circulating. It'll create a current that moves air in and out of the room.
vectors have a set of rules they need to obey (e.g. scalar addition/multiplication/etc)
Do matrices/tensors also have a set of governing rules?
>plz help
>>8097375
The set of linear operators from a vector space V to a vector space W is itself a vector space.
>>8097375
yes and no. "matrices" are not a group. it's easier if you restrict yourself to a set of matrices that all obey the same rules. for example, you can solve many problems if you only consider the set of NxN invertible matrices. those obey a similar set of rules as the ones you described.
>>8097401
what about tensors?
Do you really believe strength and intelligence are mutually exclusive?
Is this just jealousy from weak nerds who want to feel superior?
Or are physically smaller people really smarter than stronger people?
>>8097356
>Do you really believe strength and intelligence are mutually exclusive?
Me, no, most of /sci/, likely. There are fit intelligent people. And I find no shame in boney intelligent people either, different personal values.
Yes. I don't know why it happens, but it's pretty clear to me if you just look at the types of people who tend to be strong, or rather, more masculine. Something about being very masculine precludes you from developing intellectually. I suspect it's because instinctual drives are stronger in more masculine men, and so they cannot override them as easily as some of us here can.
>>8097366
There are fit intelligent people. No one disputes this. But there is a clear trend all the same.
Quick engineering question for a project I'm working on. I've spent at least 20 hours trying to figure this out on my own but I'm more confused than ever. I have a new respect for engineers now
I am building something that moves a component over an area 80 cm x 100 cm (pic related).
This is the belt (longer followed by shorter):
.080" (MXL) Pitch, 488 Teeth, 3/8" Wide Single Sided Neoprene Belt with Fiberglass Cords
.080" (MXL) Pitch, 390 Teeth, 3/8" Wide Single Sided Neoprene Belt with Fiberglass Cords
This...
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>>8097323
Also... do those parts work? Or did I fuck that up also?
>>8097323
Shit, forgot to mention:
First belt is 39.04 inchs (pitch diameter)
second is 31.20 inches
>>8097323
pls provide links to documentation, I can't access any page
wat?
nothing makes science work better than cold war and war.
>>8097220
Actually the best source of science is atheism. The greatest discoveries were made in an effort to disprove religion.
Anyways i was browsing /pol/ out of boredome and i saw a redpill page saiyng that evrything is not what it seems.Long story short i made up a little theory (BASED OFF WHAT THE REDPILL SAID).It explains why certain laws conflict with eachother and why we cant give logical explanations to them.
It goes like this. Evrithing is actualy simulated (we are just a computer simulation and evrything around us - might explain parrarel universes because there could be more simulations going at once). The entire time space continoum could be a computer simulation so thats why certain...
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Yes, you are your own minimal simulation.
how old are you OP? just curious
>>8097183
Unfalsifiable, makes zero impact on the universe itself, meaningless pseudoscience. You can believe it, but it's even less meaningful than believing in religion.
does anyone have any ideas about ways to count the number of ways an n x m grid of squares could be dissected into (1x1), (1x2), & (2x2) rectangular tiles?
I was considering trying a computer program to model it, but I'm not even sure how to start.
This is a question that comes into my head a lot when I'm in my bathroom, looking down at the pattern of tiles on the floor. (it's called a variegated pattern apparently.)
For easier version: just use (1x1) and (2x1) tiles.
for starters, I know that if the total area consists of A = n x m places, the number of patterns must be less than A^A / A!,
based on the idea of there being up to A 'belongingship' categories, with each tile being one of those at random.
this does not yet restrict a category to be constrained to including only cells next to each other, or to having certain shapes.
you could probably also make graphs that connect every configuration by operations that either:
> connect two adjacent 1x1 squares into a 2x1
> split a 2x1 into two 1x1 squares
> connect two long-edge adjacent 2x1 tiles into a 2x2 tile
> split a 2x2 into two 2x1 tiles (two ways to do this)
then you maybe could analyze the topology of that graph - there would be a structure based on values that tell you a) the number of 2x1 tiles b) the number of 2x2 tiles
for 2xn, I get a result that says add the numbers in the vector that results from multiplying a vector
[1 0 0] by the matrix [[1 0 1][1 1 1][2 2 1]] raised to the nth power.
Hey, /sci/, I want to order a book off amazon that helps me understand concepts on astronomy and whatnot, but also keeps itself interesting. I don't want a huge text book just like a novel length of something. Any suggestions?
>>8097160
The Manga Guide to the Universe
http://www.amazon.com/Manga-Guide-Universe-Kenji-Ishikawa/dp/1593272677
Otherwise suck it up and get the big orange book (Carroll and Ostlie's An Introduction to Modern Astrophysics) then slowly read through it and motivate yourself along the way.
>>8097393
>Be me
>Interested with the idea of the manga guides
>Have some free time after finishing up a manga, probably Holyland.
>Decide to pick up the manga guide to calculus, even though I already know all of it
>Writing is decent
>Nice comedy
>Everything is fine, would read all of it simply for the entertainment......
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>>8097422
>English translation should be reversed as is standard of Japanese books simply because of its source
Yeah, no one in America will complain about that. Good idea.
Why can heat be transmitted through empty space/vacuum? Sound, for example, needs air or water to do so, but heat doesn't.
>>8097116
heat cannot be transmitted through space/vacuum.
heat is transmitted through a medium.
radiation can be transmitted through space and vacuum though, because it's an electromagnetic wave.
Use your fucking brain, stupid.
And your statement isn't inherently true.
Google black body radiation you dumb motherfucker.
Vacuum is filled with aether. Aether is a medium for electromagnetic waves
Why has there never been a female polymath?
>>8097004
> implying
https://en.wikipedia.org/wiki/Hypatia
