Archived threads in /sci/ - Science & Math - 140. page
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Hello /Sci. I'm no engineer by any means but I am sometimes creative. I'm thinking about trying my hand at building a roof rack system for my car, because I'm cheap and don't want to shell out 500 bucks to buy one. Anyway, this is the design that sort of makes sense to me, excuse the awful drawing, does it make sense to any of you?
>>8080328
Goddammit, sorry it's upside down, I have no idea why
I suppose you can help me with this quick problem:
20% for rain on Saturday, and 30% on Sunday. What's the probability for rain in weekend?
Has self studying over the summer before taking the class benefit you guys before?
nope. i tried it once and got burnt out. just enjoy your holidays and work hard during the semester
>>8080305
yes
a few days of studying group theory while i was at a summer conference made the first 1/3 of the class a complete breeze while others were struggling trying to figure out cycle notation for symmetric group
>its a "Select all images with a store front.
Click verify once there are none left." episode
Setting up a home lab, where does /sci/ buy most of their lab equipment?
>>8080242
>buying lab equipment
Holy fuck dude, how much money do you have?
I buy my glasswares at walmart. At the moment I am conducting an experiment to see whether there is a proton exchange when I mix baking soda with vinegar.
>>8080294
there is
Really makes you think...
It is the only known object that can classify itself as an object.
>>8080042
What about A.I.?
>>8080054
show me an ai that can classify itself as an object
Just finished calc 2 starting calc 3 tomorrow for summer session. Was calc 2 or 3 harder for you and why? I personally thought calc 2 was pretty difficult. Thoughts?
Calc 3 was supposed to be easier than Calc 2, according to "everybody"
I thought Calc 3 was harder.
I had a really shit teacher though (MA and PhD in education, not math)
>>8079846
>Calc 3 was supposed to be easier than Calc 2, according to "everybody"
>I thought Calc 3 was harder.
This.
I took a class that was calc 2 and 3 crammed into one semester. I guess it got a little bit more difficult as the semester progressed.
>P = NP
1 + 3 + 4 + 5 + ... = -(1/12)
>>8079917
STOP
>>8079796
I don't get why people think there's any way that P = NP. It implies that it's possible to build a machine that can make random guesses from finite possibilities and always have the guess be the right one. It's absurd.
I'm curious about my IQ, where can i test?
if you live in a major city contact MENSA.
If you're in college, ask if your psychology department does IQ tests.
If you have access to a mental health facility, often they can perform them as well.
Do not take internet IQ tests, not of them are valid in any sense.
Thank you
Go to a reliable psychologist.
You might have to pay for it however.
Are you a platonist or a nominalist? Explain why.
Platonism is codeword for postmodernism.
>>8079702
the exact opposite. Undergraduates trike again !
>>8079702
How's that?
Hi /sci/
Let's talk about microbiology. I personally know next to nothing about it, but would like to know a little more. I hope this thread can be used to shed some light on this very interesting subject. Specifically genetics. All I can do to contribute is ask questions.
There are many things about how genetics that are complete mysteries to me. Like, how does one extract DNA from cells, sequence the DNA genome, build custom genes, splice those genes into specific parts of a genome, and insert them back into a cell? This must involve some very clever tricks...
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Ok, I'll try and answer your questions in a way that's easy to understand without much background knowledge.
>how does one extra extract DNA from cells
For most labs, we have kits that allow us to burst open the cell and nucleus, and then filter out the DNA from other cellular components with specialised membranes.
>sequence the DNA genome
Lots of ways here. For whole genomes, is basically a lot of random sequencing all over the genome, followed by finding overlapping regions and assembling...
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>>8079533
I forgot one part of your question.
> put it back in the cell
By treating the cell with chemicals affecting the cells channels, you can induce a stress state with heat that causes the cell to uptake any DNA from the external area.
>>8079533
>Lots of ways here. For whole genomes, is basically a lot of random sequencing all over the genome, followed by finding overlapping regions and assembling it into a whole genome.
Doesn't explain how actual sequencing is done.
>I'm not entirely sure what you mean by this
He probably means how to synthesize a gene in vitro or something.
>Enzymes are used to cut the DNA unequally, leading to short single strands...
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EEfags, what kind of multimeter do you use, and why?
velleman here
cheap and german quality (actually made in china)
I use the one that works
>>8079509
cheap one.
save your money for a nice oscope
What are some cool chemistry words? I'm trying to find a cool gamertag and I want something science or space related.
>>8079179
"degenerate HOMOs" is a legit chemistry term
>>8079179
Antibondage
>>8079179
My favorite is neopentane.
Also: https://en.wikipedia.org/wiki/List_of_chemical_compounds_with_unusual_names
Why are scientists hostile to the idea that the other planets affects Earth's processes?
I won't tell you astrology is legit but I will say the position of the planets affects what happens on this rock.
For example, the Moon's gravity affects the results at the Large Hadron Collider:
http://arstechnica.com/science/2012/06/full-moon-affects-large-hadron-collider-operations/
The damn moon phase affects particle interactions!
My dad is an amateur astronomy. He travelled to Australia to watch the transit of Venus. The orbit of Venus affected the location of my dad on the Earth!
But if I ask him (or most scientists) if the planets affect the happenings of Earth, they'll say that's nonsense.
Why? Is it a superiority thing? "I'm more superior than you because I don't believe in astrology/magic" (which doesn't even make sense because I'm not arguing that the newspaper astrologies are accurate by any means). Is it fear of the unknown? Is it simply unformfortable to realize the simplest of things are actually incredibly complex? I don't get it.
If there's a really cool Moon, I'll go look at it with binoculars.
I didn't summon the Moon - I'm not the independent variable. The Moon's position is the independent variable - I simply reacted to it making me the dependent variable.
>>8079157
Go outside
Look at the moon
Take a potato
Hold it at arms length
>The gravitationall pull on your head from the potato is greater than the pull from the moon.
So you're saying I can jump higher during the day than at night?
Chemistry student here, I came across a curiosity in a thought today that I'm wondering if any of you guys know about.
I've only really dealt with quantum mechanics with regards to electron density probabilities and the like, but I get the basis of it, with that space itself is quantized. But, given that space is quantized, and there's a minimal 'unit' of reality, is there then a minimum angle unit? I mean obviously a perfect sphere is impossible to materially produce, given that the units of material are discrete, but thinking about how in a...
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>>8079123
Space is not quantized.
>>8079123
>is there then a minimum angle unit
1 Planck length / diameter of the visible universe / 2Ï€
>>8079123
>given that space is quantized
It's not. I'm guessing that you're referring to the Planck length, but that doesn't imply that there's a "minimum distance", in fact the Planck length has no physical relevance.
>have to write a paper on gene inheritance
>40 of the 100 pages in I have writers block
>due Thursday
What's a good way to get over writers block /sci/?
>>8079119
>tfw genius but lazy
>>8079119
>biology assignment
>100 pages
this is why I chose EE
>>8079119
>writers block
>technical subject
oh wait, biology. idk i don't write fiction
Hey Sci,
What are the math/physics prerequisites for studying QFT?
Basically a full BSc in physics. No I'm not kidding.
>>8078993
Phys: Special Relativity and Quantum Mechanics
Math: Idk, depends on how deep you want to go. For a introductory course you should be good with PDEs and Complex Analysis at the "for sci.&eng." ' level.
