Archived threads in /sci/ - Science & Math - 180. page
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Is there any point in manned space travel if it's impossible to move faster than light?
It seems to me that if humans aren't going to go out and colonize the galaxy there's no point leaving Earth at all. Might as well just send probes and fix up the planet we've got.
>>8043802
Resources from nearby asteroids, m8. Also the exploration factor from making new settlements even in our solar system.
We definitely do need to fix our problems here on Earth, though.
>what is time dilation
>>8043802
You are a wise man, anonymous anon. Your words reflect truth and justice.
1) Is everything quantized ?
2) Is time quantized ?
3) What are the implications of this on simulated reality ?
4) Are strings the 1s and 0s of reality ?
5) Are the smallest building blocks of matter identical to each other ?
>>8043629
There are theories of everything that are quantized. No one knows what the correct TOE is. /thread
if everything was quantized we would have not known circumference
prove me wrong fags
This is actually a subject of my research, and AFAIK it's really an explored field. We're looking at topology problems from a quantized perspective, and then switching between discrete and continuous perspectives by changing the mesh resolution. It's fascinating stuff.
Did the big bang occur from a singularity or something else?
Suppose the big bang erupted from a singularity. How does an infinitely or near infinitely hot and dense state (containing all mass in the universe) existing as a singularity actually explode? Everything we know about singularities says that they do not overcome the effects of quantum gravity and continue to exist as singularities until they evaporate. Why then would a singularity, in a pre-big bang universe, with nothing else to effect it suddenly inflate?
What if the big bang did not occur from a singularity?
Suppose the pre-big bang universe did not have pre-existing space for a singularity to inflate into and that the physical boundaries of space was the dimensions of a pre-big bang singularity. Theoretical 0 space.
If the universe began as a singularity then the universe's initial state was a singularity. Since there was only this singularity the universe was just this singularity. Because the singularity was all that existed and was infinitely dense, then in the perspective of the universe there was thermodynamic equilibrium because heat and mass are evenly distributed...
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>>8043591
>explode
Bait
>>8043600
Supposing there is pre-existing space in the pre-big bang universe. With any amount of pre-existing space in comparison to the pre-big bang singularity there would be low entropy as all heat and mass is unevenly contained in one point.
Summoning all math & physics newbies:
I thought of an interesting problem to work on if you haven't learned it already. Let's work on it together, ruling out ideas and coming to a conclusion without cheating.
If you throw a ball up in the air at any given velocity, what will be the height of the ball the moment it begins to return to the Earth?
My lead so far is that two variables are responsible for this: the initial velocity when the ball is first released, and the gravitational acceleration constant since all objects accelerate the same...
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>>8043584
Oops! EDIT:
>the height decreases, so I can expect to see that in the denominator.
If you don't know Vi you won't know how high the ball gets, no way. Acceleration downwards by gravity acts on the speed of the ball. If the ball is going 100 m/s it will take longer for acceleration downwards to bring it to a complete stop than if it was going 50m/s
>>8043589
But this problem is assuming you do know Vi. If you throw a ball into the air (a predetermined initial velocity), what will its height be when it reaches the top?
I found a rock with a really odd feature. It's a small conical protrusion with concentric circles around it going down into the rock; the opposite side has the same, but less prominent.
I think it was found in the lower Morrison Formation.
Anyone have a clue what it could be? My friend thought if was a fossil, but I think it's an igneous rock. Not sure.
View of the obverse side
>>8043506
its a button. press it
Different view of the top.
If you assholes are tired of answering and asking the same questions over and over, I'm going to build a fission battery.
Here's my plan so far:
Refine uranium 238 down to yellowcake. Guaranteed to get a some good radium from impurities in the ore, as well as likely to get some 235 from it, so that will likely end up being my fissile materials, where the 238 will be used to kick off the fission reaction.
This will take place in a chamber and here I could use some input about materials. I'm looking to keep the cost down and use materials I...
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tl;dr
>>8043407
>Platinum
>Positively charged side of a magnet
I hope this is bait
Not baiting, don't know if protons would be repelled by like charge of magnetic field. Probably wrong, in which case, still need a material that will repel protons.
Platinum wall works because natural electronegativity, unless you've got another, better option, or I'm misunderstanding something? Can harvest enough platinum easily.
Oregon licence plates consist of three letters followed by a three digit number (each digit can be from [0..9]).
While driving to work Seth plays the following game:
Whenever the numbers of two licence plates seen on his trip add to 1000 that's a win.
E.g. MIC-012 and HAN-988 is a win and RYU-500 and SET-500 too. (as long as he sees them in the same trip).
Find the expected number of plates he needs to see for a win.
Give your answer rounded to 8 decimal places behind the decimal point.
Help me /sci/, it's from project Euler.
Does he win when the order of spotted plates is: 100->500->900?
>>8043405
No, when numbers of TWO licence plates add to 1000 he wins.
So, first plate is random
second wins 1/1000
third 1/1000
n-th 1/1000
Distribution is random, so on average he's gonna find 1000 after 50% of plates?
Suggest me some good classical music to listen to while I study Math.
Actually, any music will do; just without lyrics.
tl;dr pls help anons i can't concentrate w/o mah musik. thanks guys <3
>>8043311
Just listen to video game soundtracks. Usually does the trick for me
>>8043335
Any suggestions? I'm not into video games much (used to be during grade school, but not so much in college)
>>8043311
Chopin
Bach
Rachmaninoff
My personal favs
So I have a lot of friends who do psychedelics and occasionally they hit me up to try them(Which I don't).
I remember reading some psychedelic mushroom essentially destroys your current consciousness and replaces it with another(sorta like how you wouldn't be you anymore after being teleported)
Could have been bullshit, I dunno
Are these drugs safe?
Will the current me die if I take them?
> Science is yet to prove or examine consciousness
> Read somewhere some retarded bullshit claim as if they know what theyre talking about
kid pls...
>>8043312
>kid pls
I'm likely older than you(27)
I just don't know shit about drugs, I don't really believe in recreational drug use personally but I feel like the experience could help me become closer to my friends.
If it was just weed this wouldn't be an issue but psychedelics are fucking spooky man.
>>8043322
Calm down, pick a nice day and try them. Always remember that no matter how fucked your perception is, after you sleep its gone and what you saw will be a faint memory.
Irreversible damage to your mind are very unlikely and if you consider yourself a strong willed person at all you should definitely try tripping.
![WMPe6ba67d3-eb0e-4108-ab45-fc1a1ce54bd4[1].jpg](https://i.imgur.com/Kyj19Hq.jpg "WMPe6ba67d3-eb0e-4108-ab45-fc1a1ce54bd4[1].jpg")
Hello /sci/. I am asking a couple of the boards I respect for some advice and you are one of them. Please hear me out:
As a teenager I loved reading Philosophy. I devoured Nietzsche, Camus, Dostoevsky, Popper, Aristotle etc. etc. but when I finished school I decided to study physics because I fell for the "better do something objectively useful" meme and also because I felt that it would somehow validate me intellectually to do something most people percieved as being hard.
I have now finished my Bachelors and am in the first semester of my Masters and...
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>>8043215
you spout meme, unrelated authors and show absolutely no signs of actually knowing any philosophy
you sound like you want lazy continental memery. and that sounds like an absolutely terrible idea.
if you're sick of your degree you definitely need to change ASAP though, so tell us more about your interests, at this point it's only "i like meme philosophy and programming I guess" and that's shit
>>8043215
if you absolutely must study philosophy just double major you fuckhead
but you're asking 4chan for advice on a serious life decision, you're already bound for failure
>>8043228
You kind of illustrate my point. Wouldn't studying philosophy help me... well, learn more about philosophy?
In the last three years of my degree I barely read any non scientific literature and had very few creative thoughts that weren't clever ways of solving a tricky integral. In light of this I never really outgrew "meme philosophy" as you call it.
What would you call "good philosophy" btw? Russel, Wittgenstein, Sartre, Kant, Heidegger?
But to get back to my main point:...
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I'm a physics major and I typically dislike "pure" mathematics, but I'm loving this group theory stuff. Only problem is, I hate this book. It doesn't even discuss Lie groups, which are the foundations of field theories in physics.
Does /sci/ recommend any good, more advanced texts on group theory and/or other topics in math that are great for contemporary physics?
Lie Groups are more a topic of Differential Geometry than they are Algebra.
They are smooth manifolds which also have the structure of a group.
>>8043173
>I hate this book. It doesn't even discuss Lie groups.
Is this bait? I doubt there's a single introductory algebra book that discusses Lie groups. Not even Dummit and Foote does, IIRC, and that's as encyclopedic as you're going to get.
Pretty much everyone who's inexperienced enough to be reading Artin doesn't have enough background in manifolds to understand that.
That said, I think Knapp has written a book on them. I haven't read it...
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>>8043173
For basic algebra with a view towards category theory (which can be useful in some areas of theoretical physics - mostly toy models such as topological field theories) I would advise Aluffi's "Algebra chapter 0".
For Lie groups, take up e.g. Knapp's "Lie groups: beyond an introduction". You could also try with "Geometry, topology and physics" by Nakahara, where he introduces many notions from mathematics (such as Lie groups) needed in theoretical/mathematical physics....
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If water is a shit lubricant for sex, why is it so good for cleaning our hands?
>>8043127
if oil is a good lubricant for sex, why is it bad for cleaning our hands?
>>8043127
I don't think you understand the difference between "solvent" and "lubricant".
>>8043127
its not, most of us use soap. fucking slob
https://en.wikipedia.org/wiki/Mars_Climate_Orbiter
Well done America, you fucking idiots.
Meanwhile Europe's managed to land a prope on a bloody asteroid!
Why are Europoors so obsessed with Americans? You are just as idiotic as they are though.
>>8043103
Says the paki.
I'm sorry ISIS didn't have enough curry for you today, rajeet.
>>8043103
Because Americans are Europeans.
So /sci/, i assume everyone here studies a STEM field and we all know it's very tough and rigorous, but how do you motivate yourself to push when the going gets tough, when you just feel like shit when your mind tells you that you can never get better at what you're doing, that you start doubting that your hardwork will amount you any success, i sometimes get so worried about this that i just lose all motivation in working.
Pic related
>>8043083
I have no motivation
I'm gonna end it soon anyway
There's no point
>>8043083
You want motivation?
Someday very, very soon, you will be sitting in an chair in a cheap suit, sweating bullets, while I or somebody like me grills you on what you learned during college to see if you actually have something resembling a clue and are worthy of being employed.
Then you will be expected to use what you learned, 9 to 5 every weekday until you retire or die, to do something useful. Everyone around you is doing the same and if you fall behind, no promotions or bonuses for you.
>>8043083
>that you start doubting that your hardwork will amount you any success,
theres no doubt, i now know for a fact just how worthless this degree i got was.
>yfw the UK is this retarded.
Someone just nuke us already.
That's pretty terrible. But 603 entries? I don't follow. I thought AQA Maths got like 100K entries
>>8043019
The Northern Irish are beating your asses in English and they could barley speak it properly
>>8043020
I've looked at all AQA stats for GCSE maths (all the way to 07) and the number of people achieving an A grade does not go over 10%. The ''entry'' category in some of them is above 30k.
