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Archived threads in /sci/ - Science & Math - 179. page
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1 (800) 273-8255
National Suicide Prevention Lifeline

www.suicidepreventionlifeline.org

It's that time of the year /sci/. What grades did you get?
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>>7735501

Yearly reminder that anything short of all A's is a disgrace
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B+
A
A

That last grade was shortly an F before I called up the prof and informed him that my final had been in his email for a week.
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>>7735501
I like you OP

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Is khan academy a good place to start learning chemistry up the first year undergrad? I want to major in Chemistry, but I want to make sure I cover all highschool material before I go in the fall. I dropped out of my last program because of how much I hated it.
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>>7735469
>dropped out because of how much I hated it
>I'm going back in!

Why do you do this to yourself. You have enough time to find another potential interest and yet you decide to go back to the shittiest science.

Literally memorize reactions to pass. No critical thinking required.

Tell me that at least you are going into chemical engineering and not pure chemistry because at least in ChemE its less about memorizing reactions and more...
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>>7735482
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>>7735469
>but I want to make sure I cover all highschool material

No need, Gen Chem starts from scratch.

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How advanced will we be by the year 2050-100

In terms of technology, biology, space exploration,warfare etc.
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Probably no closer than we are now, but at least we wont be racists anymore (in theory)
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>>7735448
If by "we" you mean the machines that rapidly replace us, then we should be pretty advanced by then.
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>>7735456
What if humans become machines or just not human?

We get our skin, bones and organs replaced to live longer. Will we be humans still? Hmmm

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ITT let's talk about degree in physics, research work, discovery forecast, physics ebin meme and related
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Im thinking of studying physica as a degree so that i can get into expiremental deaign of qbit processors that use high temperature superconductors and magnetocaloric refridgeration
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>>7735442
>degree
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Got my exams in 3 weeks, kill me

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Why are Americans so butthurt at Europe lately? Is it because they're jelly that all the frontier science (particle physics, fusion, astrophysics, ...) is now being done here? Or more specifically because they haven't been able to catch up in these fields? Or because of the higher educational standards being enforcer here (generally speaking)? At any rate, science is one of the most globalised fields in the world. If you’re unhappy with your own country for the aforementioned reasons, just move instead of being salty little pricks. Jesus.

Collaboration, people.
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America has never really caught up, they've just offered more money/deals to avoid prosecution to the good scientists.
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>>7735415
Lmao that pic
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>>7735415
>America has never really caught up
>Who is Josiah W. Gibbs
>Who is Feynman
>etc.

Get fucked.

What is wrong with this video and way of thinking?

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Everythiiiing... You have to like math to actually get good at it, just like any sport. Ofcourse you can call yourself not a math person because you sometimes can't understand it. Sometimes you understand just the basics. There are somethings the dude says that is true but overall it's all wrong
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It's kind of over simplified. There are a lot of things that effect what makes someone "good" at math. I do think his core point, that anyone can get good at math, is largely correct (barring actual problems with the brain, like being too senile or having particular mental disabilities). I think it does a bad job of actually explaining why some people are bad at math, and others are good. There are a lot of reason that are more complex than just laziness. There are two which matter a lot which come to mind right now:
1) Who's teaching you, especially...
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>>7735604
But he is talking in a general sense. Math is segragated for the geniuses and the cold calculative people because that's what we present. Kids want to explore discover be challenged, but we make them do 20 problems in their home then 5/10 problems in their exams and tata math.

Hello /sci/ I recently quit smoking cigarettes by moving to a Vaporizer.

I tried to find some actual medical studies via google, but I guess I just don't know what to look for, because I can't find any articles that are just hard facts without shit-loads of bias.

Do any of you happen to have links to real medical study results or any insights into the effects of the standard Vaporizer chemicals(Vegetable Glycerin, Propylene glycol, Nicotine, and food-grade flavoring) on the lungs?
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The reason you can't find anything is because it's barely been studied so far. Personally I wouldn't risk putting that shit in my body until there's solid science confirming it's harmless. (And also I don't want to be chemically dependent on an expensive habit that makes me look like a tool, but that's neither here nor there.)
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>inhaling anything other than 78% N2 + 21% O2 + 1% others
>good for you
pick one

Really, anything you inhale that isnt what your lungs were designed to process is going to have some adverse (not necessarily bad, but normally bad) effect.
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>>7735463
>appeal to nature

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Trivial Question to ponder:

When roughly were the majority of the world's current population born?
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>>7735311
Between the 50's and 80's.
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>>7735311
Is that a bionicle? Shit brings back so many memories
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between now and then

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Math major here looking to learn some physics on the side. So far all of the physics textbooks I've read have all felt a bit too... "hand-wavy". It's a bit difficult to explain, but they don't feel formal enough. It just feels like a bunch of disjointed information and ways to model it.

So I'm looking for a textbook that does this physics thing a bit more rigorously. Definitions, with motivation, and then builds upon that every step of the way. Is there a name for this approach by the way? Is it a stupid way to go about things, or no?
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>>7735184
It's your brain telling you you have no innate talent and you're too stupid to understand physics. Stick to math if you constantly need everything spelled out to you like a retard.
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>>7735188
I have no trouble understanding it. I simply wish it was more rigorous. We should be able to derive more complex physical truths from basic ideas.
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>>7735192
well, you could 'derive' all the classical mechanics from the newton's laws, good luck

/sci/ Can you help me get better at competitive programming? Please advise the required math to get better at it.
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>>7735163
http://4chan-science.wikia.com/wiki/Computer_Science_and_Engineering
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Git gud.
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>>7735263
> git
xDD nice bro I see what you did there

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Hi /sci/
I'm dating a girl, and about a week ago I did the non-newton fluid experiment with potato starch and water, you know, the one that if you punch it feels like a wall but if you slowly put your finger in feels like liquid water. She liked it a lot and asked me to show her more "cool science stuff" like that (she has very little background in that).
Now, the thing is, I've been doing a lot of "homescience" stuff in the past with my geek friends, but since I am getting a PhD in mathematics soon I kind of left all that stuff behind (I...
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Also sodium and water
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1) this isn't /r9k/
2) I haven't had sex in four years and she'll probably leave me soon, I just liked the happiness I saw in her eyes while she was playing with that
3) care to elaborate? If you mean that "it burns" and stuff... how is that exciting? Might as well light up some fireworks.
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>>7735160

Draw out cycloids or cardioids or something using a pencil, some string, and different circular objects.

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Did proto-humans go through a semi-aquatic phase?
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It's not at all supported by the fossil record. The most water that any recent ancestor of ours was exposed to was due to fishing or being in the rain or whatever... but that's not at all the same thing.
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>implying you're not still 70% aquatic
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>>7735125
Trench foot all the time and all over.

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How can I make relatively pure (>70%) nitric acid?
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>>7735019
Yeah.
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>>7735019
>using an apple device
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>>7735019
this is actually very easy. you'll need an automotive battery (contains sulphuric acid), about two pounds of bitter almonds(preferably finely ground although coarse will work too), a cooking-pot and a stove. now just put the ground almonds in a cooking-pot, add about 350 ml of sulphuric acid and 150 ml of water(always add the acid first, then the water), and apply medium heat. stir vigorously for 5 minutes, remove the pot from the stove and let it cool. finally filter the mixture through a cheesecloth and you'll...

Please tell me there is a very good chance that we may discover life on the dwarf-planet of Pluto?

This world seems too alive for there not to be any such life whatsoever. I do not mean extraterrestrials, of course, I mean some advanced form of extremophiles and microrbs.

Ever since NASA made the announcement that this little dwarf has it's own mountain ranges, lakes, ice caps, craters, it's own weather system, and blue skies, I've been intrigued on rather or not life could exist on it.

It seems like all of the conditions could be there.
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>>7734992
to cold.
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it doesn't have the conditions for any kind of life to survive or even begin
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>>7735006
>>7735003
Is there really such a thing as "too cold" or "too hot" for extremophiles?

I work at a pizza place and was discussing a scenario with my boss, we have 50 toppings for a pizza.

He wanted to know how many different pizzas we could have, including having all 50 on one pizza.

I said you have 50 choices the first time, 49 the next, then 48 until only 1 is left.

Based on this simpler example.

If you have 3 toppings you have 3x2x1 = 6 different pizzas.

Example:

Mushroom Tomatoes Bacon
Mushroom Tomatoes
Mushroom Bacon
Tomatoes Bacon
Bacon
Mushrooms
Tomato

That gives 7 different kinds not...
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>>7734870

This is a simple combination problem because mushroom/tomato is the same as tomato/mushroom. There are $C(50, 50)$ ways to choose 50 toppings from 50, there are $C(50, 49)$ ways to choose 49 toppings from 50, etc.
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>>7734874

3x2x1 gives 6 different pizzas with 3 topping choices but in reality the answer is 7 because you can have each topping on it's own too.
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>>7734885

With three topping choices you can either choose three toppings or choose two toppings or choose one topping. There are $C(3,3)$ ways to choose three toppings, $C(3,2)$ ways to choose two toppings, and $C(3,1)$ ways to choose one topping. That means there are
[eqn]C(3,3) + C(3,2) + C(3,1) = 7[/eqn]
ways to choose toppings.

Your factorial answer $3 \times 2 \times 1$ is not correct. It's a combination problem.

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