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Archived threads in /sci/ - Science & Math - 39. page
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Please help a retard understand how to solve this equation;

5ln(x^2)=4ln(x^3)+6

I know the result but I'm having a hard time figuring out how to get there.
13 replies and 2 images submitted. Click here to view.
>>
5ln(x^2)=4ln(x^3)+6
ln(x^10)=ln(x^12)+6
ln(x^12)-ln(x^10)=-6
ln(x^2)=-6
x^2=e^(-6)
x=1/e^3 or =-1/e^3,denied since x has to be greater than 0
so x=1/e^3
>>
>>8506498
Thanks man, don't why I didn't think about inserting 4 and 5 into the parentheses.
>>
>>8506506
Or you could take the exponents out of the parentheses
5ln(x^2)=4ln(x^3)+6
10ln(x)=12ln(x)+6
-2ln(x)=6
ln(x)=-3
x=e^-3

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Anon what do you prefer?
Java or C#?
I'd go with java cz c# is a fucking microsoft copy paste of java
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>>8506460
Kill yourself code monkey.
>>
>>8506461
anon u prob a fat twat siting near a pc in his mom's basement so u should kys
>>
neither

ocaml

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What factors go into choosing what thrusters to use on a spacecraft, specifically cargo?
I also have some other questions, I guess. I'm doing a project but it's kinda hard to find the info I need, I think.
Well, more like it's hard to decide what I need from the info.
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Kerosene is used when you need high volume energy density (first stages). Liquid hydrogen is used when you need high mass energy density (upper stages). Hypergolic propellants like hydrazine-N2O4 are used when you need to start and stop the engine a lot (spacecraft engines and reaction control thrusters)
>>
>>8504648
Reliability/simplicity, handling characteristics, density, specific impulse

Read up on:
hydrazine monopropellant with catalytic activation - low performance but very simple, reliable engine, used in orbital systems. Hydrazine is very toxic and therefore unpleasant to handle. Various less-toxic replacements are under development, but spacecraft designers are conservative and hydrazine works.
hydrazine resistojet (or other electric heating) - higher performance than catalytic decomposition, but high electrical...
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>>8503764
>implying /sci/ doesn't have access

Just check these dubs and i'm gonna kill this world
>>
Pay maybe $100 max?

Not my field
>>
>>8503764
Travel to France

All genetics majors or people simply interested are invited. Food for thought: If humans differ by Single Nucleotide Polymorphisms and these occur at a much greater frequency than random mutations, how many possible SNP combinations are there for humans in general?
16 replies and 1 images submitted. Click here to view.
>>
>>8503728
There are as many "possible" SNPs as there are bases within the 'standard' human genome x4. Good luck figuring out the possible viable SNP combinations, mate.

Also, why does /sci/ hate genetics? I get the hate for biology, what with all the bullshit "field" scientists, but genetics, epigenetics, etc. certainly are much more legitimate?
>>
>>8503798
I don't agree with this, there are nucleotides which cannot change, especially those which confer to the active sites of essential proteins such as ribosomal subunits (I know nonsense mutations, but certain enzymes have a higher affinity to only a certain codon variant of an amino acid)

So if I had to guess it would be the genome minus a few thousand bases
>>
>>8503927
Hence why I mentioned the viable SNPs. If we're talking purely theoretical, any point is a possible SNP.

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Does caffeine fry your brain longterm ? Im 22 and been taking cafffeine from different sources from 17 yo. I started with low doses and my tolerance sometimes when incredibelly high wich also gave me insomnia and shiity sleep. I also feel depressed when the comedown hits after a huge pot of cofee especialy if i take it preworkout wich also releases natural endorphins and adrenaline. Ive been doing this shit for 5 years and i feel like im not the guy i used to be mentally. Anyone in this boat?
>pic related the body ive been striving to achieve but ultimately...
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>>8506263
man you are one stupid fuck
>>
>>8506266
english is not my native language , sorry man
>>
SCIENCE
AND
MATH

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>graduated with a 3.2 GPA in astrophysics degree with minor in mathematics
>stuck in a call centre support role for the past 3 years

Pro tip to those studying STEM: either get gud in programming or network like a chad. Otherwise you will end up like me with no future.
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>>8506161
>network like a chad
I read that as "don't be a total blathering autist".
>>
>>8506164
You'd be surprised to learn that ass kissing is a skill by itself
>>
>>8506161
Just work as a TA in your fucking university.
Or just keep applying for NASA or something

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What is the difference between a benzothiazoline and a benzothiazole? I'm reading a paper right now where they seem to be using the two interchangeably at times.
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>>8506064
LOOK AT THE PICTURE. SEE THE HYDROGENS REMOVED THE DOUBLE BONDS FORMED.
>>
>>8506065
I saw that.
It sounds like I should just blame their fucked word usage to them being from India...
>>
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>>8506064
>not using a graphic abstract

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Can anyone help a brainlet?

(a) Prove that the following is a valid deduction rule:
P → Q
Q → R
∴ P → R

(b) Prove that the following is a valid deduction rule for any n ≥ 2:
P1 → P2
P2 → P3
.
.
.
Pn−1 → Pn
∴ P1 → Pn.
"I suggest you don’t go through the trouble of writing out a 2^n
row truth table.
Instead, you should use part (a) and mathematical induction."

Can anyone help with part b. I got part a
6 replies and 1 images submitted. Click here to view.
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>>8505838
>base case
see (a)
>inductive case
assume it holds for n-1
then
[math]P_1 → P_{n−1} [/math]
[math]P_{n−1} → P_n [/math]
so by (a)
[math] P_1 → P_{n} [/math]
QED
>>
>>8505838
Show it's true for n = 2, then show that it being true for n = k implies that it's true for n = k + 1.
>>
>>8505860
So I can use the base case with n=3 like in (a)? I thought a base case needed to use the lowest possible n which would be 2.

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You're supposed to do this.
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PS: in both integrals, a=0, b=2pi
>>
>division by zero
>>
Just compute it?

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Take a long a dreadful look everyone, because this is what pseudoscience looks like.
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Jesus titty FUCKING Christmas
The Internet, social media and this generation were all terrible ideas. I choose not to look at that anymore sir.
>>
Can someone link that last article please
>>
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>>8505687
"This Nigerian king..."
"It's probably just sticky skin"
"Sometimes when I sneeze, my eyes close"

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Isn't this the most existentially terrifying graph in the history of humanity?
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>>
what happens when we breach into the meta stable zone
>>
Wuts dat
>>
>>8505685
All I am inferring from this is it has something to do with higgs-boson and the Large Hadron Collider.

Can someone brief me on what this is and why it is bad?

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Is what people say about pulling an all night the night before an exam a lie? A feel it would greatly enhance my performance tonight with a couple 5 hour energy drinks thrown in the mix.
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>>8505638
>Is what people say about pulling an all night the night before an exam a lie?
It would help if you told us what you think "people" are actually saying
>>
>>8505638
Maybe if you're reviewing and not learning like most people do. And you ensure you get proper 8 hours rest before doing the allnighter, which I assume leads directly into the test.
>>
Itll help you a little while youre up but the crash will make it much harder.


Just do some meth and stay up an extra day, its not like you do it all the time.

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Why do the majority of teenagers and people in general commonly share the mindset that math and other school subjects are useless and they will never be used in life?
28 replies and 2 images submitted. Click here to view.
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little understanding of how the world works
>>
>>8505633
teenagers are literally retarded. I think the hormone imbalances kick their IQs in the nuts or some shit, because it is the stupidest demographic on this green earth.
>t. edgy teenager trying to appear superior to his own kind
>>
>>8505633
Because they are being taught math without being given examples which are applicable in the real world. They're us all told to find the area of a square or memorize SOHCAHTOA, but never nudged in the right direction on where it can be useful to them so they don't give a shit.

If highschools threw in finance classes and made everyone do physics and chemistry instead of making them electives, teenagers would have a better appreciation for math as a tool instead of just viewing it as something they have...
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Was he a Meme scientist?

If so, was he as bad as NDT?
14 replies and 3 images submitted. Click here to view.
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>If so, was he as bad as NDT?
I'm watching the new cosmos right now and loving it. Whats the beef with NDT?
>>
Any "scientist" who regularly makes it to the media is a meme.

Do you hear of Galois, Maxwell and Ramanujan every day on your Reddit-tier hipster popsci tumblr blogs?

Has there been a week in your life where you haven't been reminded of the existence of retards such as black science man, le mechanical engineer specialized in climatology and evolution, le pedo atheist, Dr. Wheelchair and le galaxy buddy?
>>
>>8505505
The Main beef that people have with him is that he keeps talking about other fields of science that he's not qualified in, check his Twitter as an example.

Sagan did the same thing with Climate Change I believe and his hypothesis turned out to be wrong. Other than that, I don't think he made any other assertions.

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Picture is self explanatory. /sci/ what does the Observer observe? Obviously Vdude can't > c, but with classical mechanics his "velocity" to the observer would be c + 0.5, So what does the observer witness /sci/?
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>>8505498
Classical mechanics isn't accurate at speeds near c. Add your velocities with relativistic equations and you'll see that c > Vdude > Vrocket.
>>
>>8505498
c + 0.5
>>
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>>8505498
>See the answer to this example question

I know this is gonna sound like a trivial and pointless question, and that !because it is; but why isn't there a unit name for "per meter" like there is for "per second(Hz)"?
16 replies and 3 images submitted. Click here to view.
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>>8505375
Because temporal frequency is much more useful than spatial frequency. The only use I can see of it is in study of waves with D'Alembert's equations, and even then it's just easy to say 'per meter' or 'meter minus one'.

However frequency has a ton of uses in daily live and scientific life.
>>
The better question is why there isn't a unit name for momentum.
>>
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>>8505398

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>Reject the idea man is not at a special place in the universe
>Accept the idea man is at a special time

REALLY MAKES YOU THINK.
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is* is at a special place ffs
>>
>>8505235
>>Reject the idea man is not at a special place in the universe

Look at me mom, I read popsci.
>>
>>8505235
The fuck are you even trying to get across, retard? Come back when you can speak English.

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s = vt - 1/2 at^2
i need you guys to rearrange this for t
8 replies and 1 images submitted. Click here to view.
>>
It's a relatively simple quadratic equation.
Just pull s on the member on the right.

-0.5a*t^2 + v*t - s = 0.

Look for the roots. If t is a time, choose the root > 0 and argue that a time is always positive so the other solution doesn't make sense.
>>
>>8505215
ty
>>
>>8505173
> time is always positive
So the universe just came into existence this very moment? Wait, now I have an illusion of negative time where I started typing this post... weird.

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Is math discovered or invented?
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>>
both

the symbols and the syntax is obviously developed by humans
but the theorems and connections seem to correspond to reality

I talked to an experimental particle physicist about it
and he said that the "underlying mathematics" of particle physics has an unknown origin
the standard model describes this math

so, who knows? I just think it's fascinating that we can model reality with math, then do pure mathematics on it (like algebra) and then come up with a theorem that then is confirmed in experiments

even if mathematics...
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>>8505072
Is language discovered or invented?
>>
Is this a math thread or a philosophy thread?

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What are /sci/'s thoughts on Pharmacy/Pharmacists?
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>>8505064
Pharmacists = Doctors - Practical Skills - 100k a year + some soul

I think this because if you go directly to your pharmacist and tell him "nigga I got a headache" he can hit you up with some pills but if it turns out you need surgery that nigga ain't going to know shit about healing you. All he knows is the theory of "If sick, apply medicine. If sick after medicine, apply more medicine. If not sick after more medicine, god job".

And they earn less than doctors.

And their...
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>>8505073

If I find a medic that makes you take a MRI because you have a headache I will give you a call.

Otherwise good bait, I saved it for later.
>>
>>8505073

pharmacists aren't supposed to diagnose you and doctors don't sell pills. its just a division of labour. i do agree though that i prefer the idea of pharmacists as people to doctors.

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>Just finished undergraduate in biochem
>heading to grad school soon for Genetic Counseling
>how likely, or how soon should I expect my job to be replaced by AI?
14 replies and 1 images submitted. Click here to view.
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>>8505048
genetic counseling. wtf is that.
>>
>>8505051
Service job, just counseling people on their genetics, or their babies potentially issues. No creativity needed.
>>
>>8505051
gene therapy

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>The next 20 years will add great deal for scientists and inventors to make this happen.

I'm tired of living on Earth /sci/

Thought?
21 replies and 6 images submitted. Click here to view.
>>
Definitely don't want to live on this planet anymore. Have been sick of this place for quite some time.
>>
>>8505006
You and me aren't going anywhere.
20 years isn't a realist time frame under any conditions.
Seriously, even if we get singularity tomorrow, the luxury of space tourism bullshit is way down on the list of priorities.
>>
No. Unless we discover a way to quickly transport ourselves across solar systems with habitable, Earth-like planets with earth-like atmospheres, we are stuck on Earth. Even if we did discover new planets like Earth, they would likely have life on them, and who the fuck knows what would happen when you encounter all these alien viruses / bacteria and whatnot, it would be far worse than what happened to the natives in the Americas after Europeans came over.

No other planet in our solar system is capable of supporting human life long term. Not a single one, not even Mars. I'm not saying that humans can't set up a colony on Mars, we can, but Mars will never have a magnetic field, and while thickening its atmosphere may be possible, it will degrade over time without the magnetic field protecting it from solar radiation. There's also the lower gravity on Mars that humans will have to adapt to, and will cause major health problems among the population in the long term. Combine this with the need to live either underground, or in climate controlled, radiation shielded habitats until you find a way to create a livable atmosphere (while still having to have personnel radiation protection even if there was one) and you have a situation which is not sustainable in the long term. Maybe it would help humans survive off Earth for a few generations until some extinction level event on Earth blows over.

The best bet is to improve Earth. It's the only planet that we can easily improve, and we can improve it if humans actually worked together globally to accomplish its goals. The problem is there's too damn many people, and they all want an American standard of living, and won't stop polluting / utilizing finite resources until they get there too.

We need a global pandemic to lower the population to a sustainable level.

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So let's end it once and for all /sci/

Does knowledge = intelligence?
24 replies and 1 images submitted. Click here to view.
>>
The knowledge that intelligence is a spook is intelligence.
>>
>>8504738
If the knowledge of intelligence being a spook is intelligence then does that mean knowledge is also a spook?
Is everything a spook?
>>
>>8504736
knowledge =/= intelligence

intelligence is how effectively one uses their knowledge

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so did scientists measure 6.02214179 × 10^23 atoms in a mole or just picked that number out of their asses because it just happen to fit their equations?
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>>
You're a smart guy. What do you think?
>>
protons and neutrons happen to have a very consistent mass

atoms are made of consistent numbers of protons and neutrons such that every individual atom has a very predictable mass

if you have a gram of a pure element, then you should be able to describe how many atoms are present just by knowing the number of protons and neutrons in each atom, the mass of the protons and neutrons, and the total mass

6.02x10^23 just happens to be the constant that relates one gram of protons and neutrons to the number of protons and neutrons

well it's defined for carbon now but whatever
>>
>>8504645
Considering 1 mole of a substance always has the same amount of grams as the individual atom/compound has amu, no it is not random.

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Do you believe in life on Europa?
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>>
>>8504076
There's no reason to think there is any, and it's highly unlikely.
>>
I find life on Mars more likely. And that's not very likely.
>>
life is a statistical anomaly. it doesnt actually exist

>get good grades in programming courses
>somehow acquire tutoring position at school
>I feel a complete imposter
>mfw most students see me as a code genie™

I feel completely unprepared to program professionally. Also, I suck at math.

>t. brainlet?
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>>
>>8503615
>CS
>Can't do math
>No confidence in own ability
No, you aren't a brainlet, you're human. :')
>>
It's all an elaborate ruse for a prank TV show that America has been watching live and laughing at ever since your first day of college.
>>
>>8503615
Nah, you're pretty much a typical CS student

Source: I'm a CS major

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so, why exactly are extra dimensions needed by string theory?
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>>
Manifolds
>>
>>8503553

/thread/
>>
>>8503553
How exactly do manifolds relate to string theory?

Will this even be proven within a few years gap like the Fermat and Poincaré conjectures?
https://en.wikipedia.org/wiki/Riemann_hypothesis#Riemann_zeta_function
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>>
what do you mean 'few years gap'?

there hasn't really been any solid progress on the riemann hypothesis, just supporting evidence (especially the riemann hypothesis for varieties which is known to be true)

it'll take a serious breakthrough
>>
>>8503261
>what do you mean 'few years gap'?

>The first successful proof was released in 1994 by Andrew Wiles, and formally published in 1995, after 358 years of effort by mathematicians.

>After nearly a century of effort by mathematicians, Grigori Perelman presented a proof of the conjecture in three papers made available in 2002 and 2003 on arXiv.

It would be nice to have RH solved before 2020.
>>
>>8503283
fermat's last theorem and poincare conjecture have nothing to do with each other though, why do you pair them up?

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Well this is it, folks, pack your bags, shills, it's all over. The MemeDrive has been busted by the man himself.

https://www.youtube.com/watch?v=jCAqDA8IfR4
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>>
It has never gone beyond a meme anyway tbqh famalam
>>
>>8502708
>thundercuck
fuck off retard
>>
>>8502718
>Cuck posting

Post discarded.


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