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Archived threads in /sci/ - Science & Math - 94. page
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how many questions can you do in one day?
>>
thank you for this very specific question
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>>8450361
An amount of them.
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>>8450369
>>8450366
like as in math/physics exercises.

Does anyone have a torrent or free copy of this book? I refuse to pay 100 dollars just to do my homework.
>>
you just started doing homework? the semester is 2/3 over
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>>8450367
>you just started doing homework? the semester is 2/3 over
ROTFL. Silly frosh probably just flunked its midterm.
>>
I've just been taking pictures of the homework session in my friends book. I want my own now so I actually know what I'm doing.

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Help a retard. I've never seen the small 5 on question b. Is this a misprint or is it 3.2*5??
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>>8450309
fuck knows. the only retard is your teacher or whoever formatted that
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>>8450309
bump for interest
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are you like 15

How many fucking inflection points are there on this graph? I tried everything from 1-6 inflection points, first determining 3 (CFH) and then 4 (CFHI) but apparently those are still wrong. And there are apparently more than 6??????

help me out, please tell me how many there are.
>>
Looks like zero to me.
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>>8450190
First approach:
Inflection = was convex up (f'' < 0) but started being convex down (f'' > 0) / vice versa / straight

(straight?), convex up, convex down, convex up, convex down, convex up, convex down, (straight?)
Hence 5(+2?) point of inflection

Second approach:
Inflection = point with zero curvature (can be best locally approximated with "circle" of infinite radius).
Here you see one such point at the very beginning (not clear),...
>>
H is the only inflection point, second derivative is zero but it's not a min nor a max

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What science fair projects have you done or seen that actually make a difference in the world?
Pic unrelated
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>>8450168
A volcano
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>>8450168
nice fucking thumbnail, dolt
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>>8450708

can someone explain through science/biology how this guy was able to do this without screaming his ass off and freaking out?
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>>8450158

he tried really hard
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>>8450158

meditation is training yourself to exert absolute control over your body/mind. It may look like they are sitting around doing nothing for 20+ years, but things like this are great for illustrating what zen physiologically is.
>>
>>8450158
He burnt to bones in that position? With no sound? sheit

Why is cellular respiration and electron transport so hard?!?!? I'm literally gunna fail AP bio.
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18+
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>>8450129
you are actually autistic is you fail ap bio
>>
>>8450147
lmao not with the teacher i have.

Faggots. N = L (1-d) Isolate and give formula for d. bet you cant.
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>>8450106
d = icK
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>>8450106
Divide by L. Square both sides. Expand right side. Do math.

Call op d = icK.
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>>8450106
d = 1 - N/L

KYS

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How is controlled the expression of the first homeotic gene if there is any other embryonary gene exprimed (and therefore there is not transcriptional factors) ?
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Anyone? this is maybe a really stupid question but i'm really intrigued
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>>8450080
Rephrase your question becaue people don't understand it; 'exprimed' is not the right word in that context.
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>>8450080
>>8450212

Yeah, I'm not sure what you're asking

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cal3 is a joke, I'm kind of annoyed. they honestly could have condensed all of this into two courses instead of three
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i think it is OK. leaves more space to discuss series and some analysis topics in first year. still, it's fucking boring to take.
>>
that was the 4th class we had :(
1) Differentiation
2) Integration
3) Series and Sequences
4) Multidimensional integration
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>>8450097
that series makes way more sense than splitting integration in half and cramming it into 1 and 2.
>>8450052

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When we have a function how can we place an irrational number along either axis? I mean, if we have a cos(x) function we'll usually mark pi along the x-axis and -1 for the y-axis. But isn't the axis just a continuous number line? How can pi exist on a continuous number line? Irrational numbers are not just decimal approximations.
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>>8449985

>How can pi exist on a continuous number line?

How can't it?
>>
You just draw stuff. Of course, you can bound the expansion of pi after the 10^x decimal and get down to distances small as atoms, something you can't resolve in reality.
The reals are merely a model for space. The assumption that our world is a manifold with a commutative coordinate function algebra is also just a physical assumption, there may not even by "points".
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>>8449991

Because if we got infinitesimally close to 3.141592... we could always add decimals but we would never reach the value of pi - only approximations of it. I'm quite new to proper mathematics to be honest so I'm not explaining myself very clearly. Basically I just don't understand how irrationals - which as I understand are not just decimal approximations of numbers - can be represented on a continuous number line built around representing decimals

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Does anyone know how to do these? Have a whole sheet of practice problems like this and can't for the life of me figure a single one of them out?

Can someone who's actually good at maths give me an explanation or something to help me get started?

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>>8449968
Holy shit is it possible to be this dumb?

Sage, belongs is sqt
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>>8449968
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>>8450031
The integral of 1/x is lnx

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Why is x / 7 roughly approximate to 14 * x / 100?
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saged
>>
because 1/7 ~ 14/100
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>>8449950
because 7 8 9

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What are some common misconceptions when it comes to probability or random phenomena?

I'm going to be doing a small study on my senior students (I teach high school) and I wanted to examine what are some of their biggest misconceptions and how I can start addressing these.

Any teachers here?
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>>8449938
If it's just high-school, then a great one is that one problem with the three doors and goats.

They fail to account for the fact that "He will always choose a door with a goat behind it" is valid and relevant information, completely changing the odds of your decisions.
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>>8449945
Yep just high school seniors. I teach students that don't really have a strong interest in the subject, just want a credit in their senior year. The class is mostly ACT Prep and just general life skills math.

We will be looking at the monty hall problem though. That's a good one :)
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That everything has probability of 1/2 cuz it either happens or not

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How can i solve the toggle mechanism?

Is there a single loop equation or do I solve it as two mechanisms (four bar crank rocker mechanism and crank slider)
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Is the movement of the box simple and harmonic?

t. Physicists.
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>>8449907
It's a prismatic kinematic pair

t. Engineer
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>>8449896
isn't the bar between the radii changing length?

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which one of you faggots is responsible for this
https://arxiv.org/pdf/1610.03452v1.pdf
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>>8449866
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the authors are listed at the top brainlet
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>A Longitudinal Measurement Study

what the fuck does that even mean?

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Can someone explain to me how light works? It has no mass, yet it's attracted by black holes. If it has mass, how is it able to go the speed of light? I thought things with mass couldn't go the speed of light?
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>>8449808
Great thread! This will help me brush up on my meme understanding of general relativity. If you asked me over the Summer I would have been able to answer you probably because I was reading Kip Thorne's book: Black Holes and Time Warps.
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>>8449808
Electromagnetic radiation. Gravity affects it because gravity is the curvature of spacetime and light travels through spacetime.
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>>8449808
this should clear things up for you
$R_{\mu \nu} - \tfrac{1}{2}R \, g_{\mu \nu} + \Lambda g_{\mu \nu} = \frac{8 \pi G }{c^4} T_{\mu \nu}$

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This follows from the field axioms (next post).
Can the axioms be fixed so that $(-1)(-1)=-1$ (next next post)?
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>>8449781
Reference:
http://mathworld.wolfram.com/FieldAxioms.html.
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>>8449781
$(-1)=(-1)1$ (3)
$=(-1)(-1)(1/(-1))$ ($1=(-1)(1/(-1))$) (4)
$=(-1)(1/(-1))$ ($(-1)(-1)=-1$)
$=1$
What do now?
>>
(-1)^2 = -1 is true in characteristic two but not in any other characteristic

what do you mean by 'fixing the axioms'? you would no longer be working in a general field if you forced (-1)^2=-1.

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>his imaginary unit is not cursive
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>>8449762
I try to but it always ends up looking worse
like an upside down curly v
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>his x is not cursive
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>writing $\frac{\delta y}{\delta x}$ instead of $\frac{\partial y}{\partial x}$

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>Fuck you Navient I currently owe $78k for Phd in computer science from UCLA. 25 replies and 7 images submitted. Click here to view. >> File: trump7.jpg (1 MB, 3154x2503) Image search: [iqdb] [SauceNao] [Google] 1 MB, 3154x2503 >he isn't a trust fund baby debt: 0$
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Britbong here, I owe around £30,000
>>
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>>8449747

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Atiyah comes through with another solution to a long unsolved problem, proving the non-existence of a complex structure on $S^6$:
https://arxiv.org/pdf/1610.09366.pdf

What is /sci/ reading? What problems are you working/stuck on? Progress on research/theses?
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why is grothedieck bald
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>>8449671
To keep the government out
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>>8449662
do we have confirmation that Atiyahs proof is accepted or not?

The dude is getting old and his abstract seems to suggest he didn't need any new ideas to solve it. Seems strange that the proof would of been missed for this long.

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If you could send a post-it note back to the past to young Albert Einstein

what would you write on it to start him off?
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Dear jewish little cunt

Please support hitler he is our only hope to advance science and make humanity progress.
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>>8449655
Remember to look for connections between the speed of light and time. Remember America has fast food.
>>
mup da doo didda po mo gub bidda be dat tum mufugga bix nood cof bin mo fugga.

also
the universe is kill.

Professor scanned part of this plasma physics book from the 60's. I don't understand what the colon notations mean... any help /sci/?
>>
They're just references.
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>>8449539
>magnitude, all terms in earlier expression
could it simply denote ratios?
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>>8449541
Look here.

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What happens in a person's body if they receive a blood transfusion but don't already have blood loss? How much extra blood can a body handle? What happens if a person has too much blood?
>>
What do you think blood doping is?
>>
Look up TACO (transfusion associated circulatory overload)

Also for interest look up chelation needs for people that have frequent transfusions... Iron builds up over time.
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>>8449548
>TACO
>it's legit
well I learned something on /sci/ today

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So i'm hella sick and I have a personal dilemma to solve. I have had 40°C fever for 4 days now and I can't decide what to do anymore. My options are:
>Take an 400mg ibuprofen pill to lower your body temperature by sweating for around 5 hours continuously. Can't catch any sleep by doing this.
>Do not take the pill but bare the headache till you fall asleep for around 45 minutes
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>>8449505
>>
>become unsick
or
>maybe become unsick
You'll likely pass out regardless
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>>8449505

Go see a doctor you retarded faggot.

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How come the solution to powering Artifical gravity isn't as simply as putting magnates on the side of an elliptical ship and control long the strength of the magnets? The only problem I can think of is piloting would be a bitch

I've illustrated an example
>>
Where is the person in this model and how is he experiencing gravity?
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>>8449418

A little riminder that people are not magnetic
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>>8449635
>magnetic clothing
>floor of ship is magnetic
granted, it would probably make nearly every device on the ship non usable.

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Can anyone simplify the idea behind Complex numbers?

I would like to understand why most Quantum Physics theories are based of this and why is it coherent to accept them as a precise and inductive type of mathematics?
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>>8449392
haha xD only math nerds will understand this one !
>>
>>8449393
That is why I am asking!
>>
What do you not understand about them anon? Essentially it's just a 2D vector of 2 real numbers, one of which is multiplied by the imaginary unit i. i satisfies the equation i^2 = -1 [on this note I'd like to add that saying i = sqrt(-1) is sort of wonky since you lose uniqueness, but 'it werks' so engineers do that regardless].
In a way complex numbers are a lot more natural to 'end on' than reals are, seeing that now you have an inverse to any standard operation.

>Deduct that our universe has to be a simulation, makes no sense otherwise and is pretty much widely accepted for years and years
>Suddenly normies hear about this fact, start having an existential crisis and making up reasons and having wild assumptions as to why this a "more legitimate" basal reality

I find it funny that some these people are the same people will defend (not that there is anything wrong with it) conscious upload and the like.
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>>8449387
>makes no sense otherwise
is less likely* at best

>widely accepted for years and years
by whom?
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Define simulation.
>>
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>>8449387
>Doesn't believe in god, a greater being, a creator who created all life
>Believes that our world is just a simulation
Doesn't that contradict each other? Not saying that this is you, but I am sure there are a lot of edgy popsci fan atheists who happily bash religion yet totally believe in the simulation hypothesis since first hearing it. Pic somewhat related.

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Im taking the GRE in 2 hours sci

Wish me luck brehs

Pls no bully
>>
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I hope you remember not to breathe and blink manually during the test.
>>
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>>8449321
>>8449323
Thanks guys

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i have a cold

why does sneezing feel like a mini orgasm?
>>
>>8449290
That's a good question. Just a while ago I tried inquiring /sci/ if there's any studies on the neurochemistry of sneezing but didn't really get any answers.
Apparently most people don't even really notice the euphoria of sneezing. It's hard to say if this is a matter of attention or different wiring.
>>
what

sneezing just hurts a little for me
>>
>>8449331

the build up to a sneeze feels exactly like the build up to an orgasm only difference is that it's around your face and not penis

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