Archived threads in /sci/ - Science & Math - 382. page
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/sci/ Let's solve simple mathematics problems using triple integrals.
Here's the first one.
>Don't forget to use your conversions senpai
>>7812302
>mi
>ft
discarded
100 mi^2 * 20 ft * 0.4 micrograms / mL
== 632000 kg
I'm in Law School, I forgot how to calculate that and I bought the wrong kind of bleach.
i try to masterbate but i dont have enoug to one and when i cum it isnt whole and my masterbate is fire
>>7811924
1.2 litre water.
Hi sci how to i know when to use the residual theorem or the integral cauchy theorem ?..
When you are to calculate a complex integral.
>>7811831
You're integrating over a circle. If your fucking function is discontinuous in the circle, you use the residue theorem. If it is continuous over and in the whole circle, the answer is zero. Fucking open your book for once.
>that guy who says "amperes"
>that guy who says "electromotive force"
>that guy who always interjects about work being "force dot distance, not force times distance"
What class is this? Engineering?
I thought physicists weren't autistic.
>>7811093
Who says "electromotive force"?
I thought that hasn't been the case for decades now, it's just "EMF".
>>7811093
Dot is actually more accurate because it's the dot product.
I came across the EMdrive recently. It appears to be pseudoscience. It cannot work without violating conservation of momentum.
But then I found it was independently verified by three teams. How is this possible?
>note that those 3 teams arent billionaires right now rigorously using this technology to advance jack crap
the results are so small, people are waving their hands off as merely normal interference
>>7810433
SPR is actually trying to market it as an alternative to ion drive for satellites
>>7810429
"There are other examples of observation conflicting with the 'laws of nature', such as galaxies rotating at speeds different from that predicted by the 'laws of nature'. In this case, rather than modifying the 'laws' to conform to the new observations, the theorists simply revised the universe to confirm to the laws by 'deducing' existence of dark matter and dark energy from the fact that the galaxy rotation would be 'violating a law of nature' unless the universe...
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Ok, question ahead that may appear pretty dumb to you, but still listen:
I'm living in austria fyi and lately came to doubt that people we consider ignorant and stupid really exist. I mean, I never personally met one, the people around me are just fine and always were, even the people in elementary school were pretty average. Yes, I may have seen them on the TV, social media, all that stuff. But I have never ever met one face to face, no one that was like "Uh, I have no idea what you're talking about." Everyone was pretty fine and could talk and argue...
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Or more direct, why do people believe people who can't comprehend basic language are common, when I never talked to one? Where are they? Is being stupid just believing propaganda and simplistic ideals, which is way more common?
What is stupidity?
>>7804806
>why do people believe people who can't comprehend basic language are common
because everyone pictures themselves better than anyone else, duh
>>7804810
So, "stupid people" are just a stereotype and actually only exist rarely?
Then back to my question, what is general stupidity and how did you encounter it
I truly never understood why depression is real and how we can find out if someone has depression and is not instead a chicken who can't face life’s difficulties and takes the easy route.
>inb4 killing yourself is the hard route
How do you differentiate between someone having it and someone not wanting to face difficulties? I'am open to both sides. More leaning on the side that depression is real but just have a hard time knowing why or how we can know for sure. I've never had depression so it's had for me to relate.
>>7802513
Depression affects the brain on a neurological level, and can be physiologically diagnosed this way. It is thus incontrovertibly real.
>>7802513
To give you perspective on how shitty depression diagnoses are. I was a whiny bitch on high and cut myself because my gf broke up with me. I went to therapist. Here is the extent of how she made my diagnosis. She pulled up a list of depession symptoms and made me check off the things I was experiencing. I checked like more than 5 or something and she told me to go to a prescription for some medicine. I was fucking diagnosed by what was basically a buzzfeed quiz. I feel like most people diagnosed don't even have...
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>>7802529
My fucking English failed me there.
>have to write three pages essay due tomorrow
>didn't even manage to write my introduction after three hours
This fucking nigger loving bitch and her social science shit, I don't give a fuck about Participatory Rural Appraisal or science for societal transformation.
nice blog faggot
Then why did you take the class?
>>7812684
Mandatory.
>Bulletin of the Atomic Scientists
>Nobel laureates
honestly it baffles me how groups like this exist. what exactly is their point besides parading around in STEM memorabilia and making a fool of themselves?
>>7812655
...do they not even bother talking about the Cold War in schools any more?
>>7812667
...do they not even bother talking in schools any more?
>>7812655
>They don't shill for nuclear power
>They're bad!
Anyone statistics here?
In a binary logistic regression, let's say you have a significant interaction between 2 continuous variables. How would you plot that interaction on a graph? Is such a thing even possible?
Can you give a concrete example of what your RVs are? Also, I thought you couldn't have your dependent RV be continuous in logistic regression?
>>7812506
Not sure about RV, but the dependent variable is a binary outcome (Not using/Using a car), and apart from covariates, the two independent variables are strength of environmental attitudes (scale treated as continuous) and time since moving home (months). Both are independent predictors, and an interaction effect is significant.
>>7812535
Alright, I'm not sure exactly how to do it, but according to http://www.ats.ucla.edu/stat/stata/seminars/interaction_sem/interaction_sem.htm, it seems like you can indeed plot interaction against the values of the covariate (plot at roughly 1 third down the page). Apparently you first need to decide exactly in which way you want to model interaction: in their example, they use difference of differences, but they mention using ratio of odds ratios in a table a bit above that. I guess unless you have some kind of insight about which one to use for your particular problem, you should try them all and picking the one that looks best compared to what you're trying to show.
I can't help much more: I'm decent at probability but I haven't done any statistics for almost a decade so I tend to just use cookbooks.
Is this even possible?
[math]\sqrt{6} = \sqrt{9-3} = 3+i\sqrt{3}[/math]
Are you implying that [math]\sqrt{x}+\sqrt{y}=\sqrt{x+y}[/math]?
>>7812176
wait why doesn't the latex work
>>7812162
No, you can't break up sums in a radical.
For example, [math]16=\sqrt{256}=\sqrt{64+64+64+64} \neq \sqrt{64}+\sqrt{64}+\sqrt{64}+\sqrt{64}=8*4=32[/math]
How would I do this? I'm a lot worse at logic than I thought I was.
LOGIC GENERAL
>>7811955
Well, consider what the Tarski-Vaught criterion implies.
Problems there?
Here's an elementary thing I like:
Prove that [math](\mathbb{N}, +, \cdot)[/math] is a definable substructure of [math](\mathbb{Z}, +, \cdot)[/math].
>>7811955
Where is this taken from?
>bosses want to automate transport with robots and AI
>signal failure delays every week even with human drivers
>muh robotic revolution!!
Who else here convinced that automation and AI won't get anywhere near to what technolibtards are hyping about?
>>7811916
All we need is a self-replicating nanobot designed to kill humans, shouldn't be too much to ask.
>>7811920
Rumours are that working sex bots will also lead the the (slow) extinction of the human race.
>>7811916
we are still so very very far away from anything remotely close to AI. we won't have AI till we basically create true synthetic brains, and thats not going to happen until we actually figure out how our brains work.
shit, we don't even have the power supply or linear actuators required to make a decent android, OP's pic is uncanny as fuck.
Anyone Watch Star Talk? Any particular episodes that are best? or should I just pick ones I like at this point?
>inb4 meme scientist
Don't ever fucking post on my board again unless you have something meaningful to contribute.
>>7811258
I don't get it, why do you guys hate everything that's popular?
I'd seriously like to know what's wrong with it, in a non-ironic kind of way, mr. cool-anon sir. (not OP)
The past half century has along with the steep decline in biodiversity in wild species also been accompanied by an incredibly rapid and often crassly intentional destruction of traditional livestock breeds and their associated cultures and adaptations.
The question I ask is do traditional genetically diverse livestock varieties have a place, or are they set to be replaced by intensively bred genetically uniform breeds?
Do you even care?
>steep decline in biodiversity
Source? I'll remind you that animals have gone extinct at roughly the same rate they've come into existence for about as long as life has existed on Earth
>>7810843
Halocene extinction
Extinction is part of existence and new species will sometimes adapt to fill the void.
but does that mean we should artificially create the void?
>>7810875
>but does that mean we should artificially create the void?
If it benefits humans, yes. Why not?
