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Archived threads in /sci/ - Science & Math - 163. page

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File: nikola tesla.jpg (221KB, 718x962px) Image search: [Google]
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He's widely overrated, i mean he had some neat ideas, but people compare him to Einstein and Newton which is laughable

he never really had any revolutionary ideas
30 posts and 2 images submitted.
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>>9112614

Because he is the only famous US scientist.
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>>9112614
wow your bait is shit
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>>9112614
Tesla coils are cool

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I bought some lenses for the solar eclipse, that meet ANSI Z80.3-2010 requirements and block 100% of UVA/UVB. My question is how would something like this hold up to the rays during the eclipse? I understand that the Sun emits UVA UVB and UVC, although UVC does not pass through our atmosphere. Would these be of sufficient protection against the rays during this event? Thanks
5 posts and 1 images submitted.
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No, they are not.

https://standards.browntechnical.org/products/ansi-z80-3?variant=27775373193

>These products are commonly called sunglasses, and they are not designed to be industrial safety eyewear as defined in ANSI Z87.1, or to provide corrective prescriptions as defined in ANSI Z80.1, or to provide protection for selected sports as defined within ASTM F08.57 committee standards, or to provide protection when making direct observation of the sun, such as for viewing a partial or annular solar eclipse.
you bought shitty raybans
>>
Can you explain why if they block UVA/UVB there would be an issue? What is the actual Science behind it? I'm very interested
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>>9112575
then post in the eclipse sticky fuckwit

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How will science solve this?
79 posts and 7 images submitted.
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>>9112326
Hopefully with a banhammer
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>>9112326
It won't. Same issue with the Star Trek teleporters being suicide machines. A new you pops out with the old you's memories, but each time you use one you die and cease to exist.
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>>9112326
>gradually replace parts of brain with computer parts
>brain in jar

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>tfw your tutor dropped you and even refused payment after realizing your brainletism was just too much for him
30 posts and 4 images submitted.
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>>9112145
https://youtu.be/UDA3fF6WsVQ
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your tutor was dogshit assuming both of you communicated clearly on your needs
>>
>be tutor for geometry class
>teacher assigns me specific student
>realize this bitch is having problems with basic algebra
>okay no problem I'll review that
>realize further this bitch doesn't even know exponents
>bitch doesn't even know her times tables
>fuck it I got the time
>"Multiplication is easy. Let's start with the ones..."
>explain how it works
>"Now, what's 1x2?"
>"3"
>let's go simpler
>"what's 1+1"
>*uses fingers*
>"3"
>bitch calls her dad on me
>"Sir your child is a dumb ass."
>bitch gets kicked out of the class

Try teaching concepts about sine and cosine to someone who can't even add.
On top of all this she was a nigger.

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what was it /sci/? how is it possible that the formula has been totally lost?
4 posts and 1 images submitted.
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Napalm. It's said that the recipe was lost, and while that's certainly true, that's essentially all it was. It was likely just made a different and probably more organic based way.
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>>9111906
>Napalm
>aluminum NAphthenate and PALMitate
Not even, fgt pls
fabricate bullshit much?
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>>9111890
any sort of rendered lipids would have done what greek fire was described.

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Is cosmetic reflorastation possible yet?
It'd be pretty neat smelling delicious if I didn't shower for a week.
3 posts and 1 images submitted.
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>>9111750
you're not a dog you fucktard, your fat ass sweat will smell like shit no matter what
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>>9112080
Humans have skin flora too.

So, I'm soon be a father. Since it seems all of the greats had an early start, what's the best way to foster my child's maths learning from an early age?
4 posts and 1 images submitted.
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>>9111682
just don't be autistic or forceful about it, you'll destroy their interest in mathematics and their aptitude elsewhere
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why teach him maths when you can crush his soul and remove his ability to love in other, less convoluted ways


then, instead of reading him math books , you could just do coke and bang strippers every night
>>
Do math with them every day, but also don't be a fag and ruin their childhood, life is shit enough when you grow up.

pic related is the setup for the Delayed Choice Quantum Eraser experiment. The idea behind it is that when a photon is detected at D3 or D4, we can tell which slit it went through, but for any photons detected at D1 or D2 such is impossible to determine. The observation was that photons arriving at D3 and D4 had their entangled photons arriving at D0 form single clumps as the double-slit's interference pattern was destroyed, but those arriving at D1 and D2 formed series of bands which supposedly showed the re-emergence of superposition.

However, I found a problem with the basic premise:
>The information regarding which slit the photons arriving at D1/D2 is NOT LOST, we merely didn't set up the right sensors to detect it.

In order to get to the beam splitter BSc, photons must reflect off one of the two mirrors Ma or Mb. When they do that, they change momentum - and that momentum must be conserved somehow. It can only be transferred to the mirror itself, perhaps in a phonon. In any case, that change in momentum should be measurable with the right equipment - and if my understanding of quantum physics is correct, that makes it "observed" regardless of whether or not we actually set up the proper detector.

If we did, we'd be able to decompose the patterns constructed by our observations at D1 and D2 into components produced by photons which passed through each of the two slits. The aforementioned patterns are too complex to be formed by the combinations of two Gaussian distributions, and therefore...
>We can observe a so-called "interference" pattern being emitted by a single slit.

I'm not sure exactly what this implies, except that it seems to undermine the notion that our "Quantum Eraser" actually erases anything. More likely that something we haven't accounted for is generating an entirely new pattern. (I suspect a moire or interference pattern specific to the relationship between the laser source and/or prism, and beam splitter BSc.)


Or, am I just retarded?
5 posts and 2 images submitted.
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Here's the patterns photons made at D0 separated according to which detector (D1-D4) their entangled partner hit.

According to what I said earlier, the patterns of D1 and D2 must be decomposable into one part where the photons reflected off Ma, and another part where the photons reflected off Mb. And yet, there is no simple way to do so.

I suspect that the sum of the photons which reflected off Ma and hit D1 and those which reflected off Ma and hit D2 should correspond to the number of photons which hit D3 according to the transparency of BSa, but since this is quantum mechanics that could be totally wrong. Although if it didn't, that would probably be a groundbreaking discovery in and of itself.
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Think of the entire setup after the PS prism as a complicated double slit and screen.
'Which slit' info can be obtained anywhere between PS and BSc, like it can be obtained by adding detectors to the normal double slit experiment. One way would be making Ma and Mb momentum detectors but they chose to do it with BSa BSb D3 and D4. There's not really a difference.
Or 'which slit' info is by chance not gathered between PS and BSc and the superposition interference pattern is formed and detected after BSc D1 and D2 analogous to the traditional screen detector D0.
So you're right that sensors could be there at Ma and Mb but you miss the point that D3 and D4 do that same job, giving which slit info. When there's no detection before BSc the photon remains in a superposition of hitting both mirrors like going through both slits and that's what you see at D1 and D2.
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>>9111810
>One way would be making Ma and Mb momentum detectors but they chose to do it with BSa BSb D3 and D4. There's not really a difference.
With the beam splitters, must either arrive at D3/D4 OR at D1/D2. You can't measure both at once, which was the entire point of the experiment.

But you CAN get measurements both from Ma/Mb AND D1/D2 with the SAME PHOTON.

>So you're right that sensors could be there at Ma and Mb but you miss the point that D3 and D4 do that same job, giving which slit info.
But they destroy the photon in the process. Ma and Mb don't (or maybe they actually do but the new photons they make are still tied up in quantum weirdness).

>When there's no detection before BSc the photon remains in a superposition of hitting both mirrors like going through both slits and that's what you see at D1 and D2.
My point was that there IS ALWAYS detection before BSc in this setup. The mirror 'detects' the photon via momentum transfer, regardless of whether a human is paying attention to the mirror's momentum or not.

Unless you're arguing for some extreme consciousness-centric interpretation of quantum physics, to which I can only suggest we try the experiment with the changes I mentioned and see who's right.

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Is Chemistry the bassist of the Science?
5 posts and 1 images submitted.
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>>9111450
It's probably biology desu

t. biologist who plays bass
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>>9111450
It's the most basic yet radical of them all.
>>
Physics is vocals.
Chemistry is rythm guitar.
Biochem is lead guitar.
Biology is bass.
Math is drums.
Engineering is keyboard.

>he thinks that time travel is real
2 posts and 1 images submitted.
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>>9111375
>if you go faster than light you go back in time
>based on the misrepresentation of a quote from Albert Einstein, the jew guy who just stole other people's discovery

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Is there any reliable online IQ test?
4 posts and 1 images submitted.
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Yes, the mensa one.
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>>9111330
iqtest.dk
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OLSAT's are generally usually used to earmark gifted kids. That test measures IQ up to 132.

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This should be relatable to any who experiences the season known as Summer where they live. It was cloudy and rainy for a few days about two days ago. Now that it's warm and sunny, in the afternoon, no matter how well rested I am, I feel an overwhelming urge to take a nap.

Now, it's clear that the sun affects human behavior, but how would human behavior be affected in an environment as alien as Mars?
3 posts and 1 images submitted.
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Also, pic-unrelated.jpg
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FIRST WE NEED TO BEESEECH THE MACHINE SPIRIT'S WILL

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The basic idea with piezoelectric crystals is that when a stress is applied to the crystal it will generate a voltage proportional to the strain on the crystal. The converse is also true, an applied voltage will create a proportional strain on the crystal.

My question is this, if a resistor is hooked up from the crystal to ground and a static mechanical load is applied to the crystal, (let's say a mass is made to rest on top of the crystal in a gravitational field) and I hook up an oscilloscope or voltmeter across the resistor. How will the voltage behave? My intuition says it would decay to zero. Intuitively from that point i am under the impression that the crystal would elastically deform. As the elaso-electrical energy has been converted to heat.

Anyone actually know what would happen or where I am intuitively incorrect?
5 posts and 1 images submitted.
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I could also see that it may be that the crystal continues to deform as current passes to ground.
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>>9111251
Delete this post right now if you value your life. Tesla died asking the same questions. Big Solar will never stop hunting you.
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>>9111270
The Feel when the way to free energy is putting a heavy rock on top of a quartz crystal.

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What's going on here?
I would expect it to be the opposite result.
With no sword people would choose fighting the wolf right? Is having a sword really going to help much vs a bear or are are most people just overrating it?
96 posts and 6 images submitted.
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A sword would not stop a bear from killing you. At best you'd both die. A wolf, if you're lucky, you can jam your arm in his throat and pretty much disable him and survive.
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>>9111109
A sharp sword wielded by someone that knows what they're doing could easily disable a bear.
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>>9111110
Unfortunately, most people these days do not have sword fighting experience.

A wolf would definitely be easier to fight. Those fuckers are like 80-90 Ibs, all you'd need to do is avoid the bites and get head control.

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If I took Calc I two years ago, could I relearn most of the material in two weeks?
12 posts and 2 images submitted.
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>>9111068
if you ever knew it you could relearn the material in about 2 hours
Calc is fucking piss easy
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>>9111068
If you're talking about monkeying the usual problems, then yes.
I you mean understanding the theory and solving the problems of a good book like Spivak, the no.
It would take you more time.
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>>9111077
My University offers exams on the first day of the semester to see if you can place out of Calc I or Calc II. You need to get at least a 75% on the Exam to get credit. I am asking this because I would like to place out of Calc I.

Pic related is the topics that will be present on the exam.

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