/sci/ - Science & Math

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Anonymous Sun 22 Aug 02:38:18 2021 No.13546324 View Reply Original Report

Quoted By: >>13546328

>eat the fluoride, goy
wow, thanks dentists. nice job.

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Two Speakers Are 150% As Loud As One Speaker

Anonymous Sat 21 Aug 17:50:20 2021 No.13544775 View Reply Original Report

Quoted By:

How would I express this mathematically? I've heard people say this. Does this mean that the speakers are 3 dB louder, or does the 150% imply how we perceive the sound, so 10 dB louder?

I'm hard of hearing in one ear, so does that mean I hear everything as being around 70% the actual volume?

5 posts and 1 image omitted

Anonymous

Anonymous Sat 21 Aug 2021 21:39:08 No.13545542 Report

Quoted By: >>13545776

dB = 10log10(P2/P1)

e.g. 2 to 1 ratio:
10log10(2/1) = 3

3db doubles the sound intensity but perceptually is the smallest average increment in detectable loudness (if you're an mixing or mastering engineer, or a musician, maybe you might be able to hear a smaller change). 10db increase is generally perceived as twice as loud.

dB is not a mathematical description of psychoacoustics.

Anonymous

Anonymous Sat 21 Aug 2021 22:49:53 No.13545776 Report

Quoted By: >>13545828 >>13546296

>>13545542
If an increase of 10 decibels in volume is perceived as being a doubling of volume, how would you derive a function that expresses how loud sound is perceived to be based on decibel rating?

Anonymous

Anonymous Sat 21 Aug 2021 23:08:57 No.13545828 Report

Quoted By: >>13546296

>>13545776

well with those psychoacoustic rules of thumb something like

Loudness = 10log2(dB)

but who knows. is 3 db really "1.2 something" louder? is 6db really "1.5" ish? you'd have to study people.

Anonymous

Anonymous Sun 22 Aug 2021 02:24:21 No.13546296 Report

Quoted By:

>>13545776
>>13545828
I just realized, since sound perception is linear, and since we perceive logarithmic growth in volume as being linear growth, if the actual volume of sound is represented by 10log(x), then our perception of that volume is represented by 10x.

El Arcón

El Arcón Sun 22 Aug 2021 02:28:30 No.13546308 Report

Quoted By:

The first thing you would do is to notice that loudness is measured in decibels, which are a unit measured according to a logarithmic scale.

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Anonymous Sun 22 Aug 02:27:37 2021 No.13546307 View Reply Original Report

Quoted By:

>Twum, what the fuck is wrong with you? Do you think this is a playground? Do you think you're some kinda fashion model? Get back to work you dumb bitch, stop playing on your phone all day. No more selfies on the job or you're fired. I'm locking you in the lab and you're not allowed out until you're done processing the dozens of sample trays that you never touched except to take selfies with. Stupid fucking lazy scientist phone whore dumb bitch.

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Anonymous Sat 21 Aug 03:40:35 2021 No.13542753 View Reply Last 50 Original Report

Quoted By: >>13546257

The fucking madman listened

99 posts and 11 images omitted

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Hysterical american astronaut makes a hole in ISS so she can be sent home

Anonymous Sat 14 Aug 13:12:27 2021 No.13517951 View Reply Last 50 Original Report

Quoted By: >>13546061

>Concerning the possibility of the hole having been caused while on orbit, it is necessary to take into account several circumstances, says my anonymous source. Firstly, the illness of the female astronaut, which is the first known incident of deep vein thrombosis in orbit, and the fact that Serena Maria Auñón-Chancellor had suffered the condition was published in a scientific article only after she had returned to Earth. This could have provoked 'an acute psychological crisis', which could have led to attempts by various means to speed up her return to the planet, according to my anonymous source. Secondly, for some reason unknown to Roscosmos, the video camera at the junction of the Russian and American segments was not working at that time. Thirdly, the Americans refused to perform a polygraph examination, while the Russian cosmonauts were polygraphed. Fourthly, Russia never had an opportunity to study the tools and the drill which are aboard the ISS to see if there are any signs of metal shavings from the hull of our ship's orbital module.

>Finally, and fifthly, of eight holes only one went all the way through the hull. The others were skips of the drill, which suggests drilling in weightless conditions without needed support. One hole was drilled in the framework (a transverse rib of the ship's hull), that is, whoever drilled it was not trained in the construction of the Soyuz MS.

https://arstechnica.com/science/2021/08/russias-space-program-just-threw-a-nasa-astronaut-under-the-bus/

295 posts and 69 images omitted

Anonymous

Anonymous Sun 22 Aug 2021 00:43:47 No.13546061 Report

Quoted By: >>13546188

>>13517951
>deep vein thrombosis in orbit
That sounds fucking brutal
>the Americans refused to perform a polygraph examination
Good. It's pseudoscience bullshit that should go extinct.

Anonymous

Anonymous Sun 22 Aug 2021 00:51:15 No.13546078 Report

Quoted By: >>13546235

>>13518357
>when there's a real emergency
Is deep-vein thrombosis not a real emergency?

Anonymous

Anonymous Sun 22 Aug 2021 01:37:53 No.13546188 Report

Quoted By:

>>13546061
>Good. It's pseudoscience bullshit that should go extinct.
>t. pathological liar who fears the polygraph

Anonymous

Anonymous Sun 22 Aug 2021 02:01:20 No.13546235 Report

Quoted By:

>>13546078
Not really, as long as she is on anticoagulation. Just take some clexane bro, 1mg/kg BD SC.

Anonymous

Anonymous Sun 22 Aug 2021 02:07:23 No.13546256 Report

Quoted By:

>russia fucks up and almost destroys the entire space station

>russia shortly thereafter concocts an impossible, ridiculous story from YEARS ago to whatabout the americans and try to save face

sasuga, Ivan

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Anonymous Sat 21 Aug 20:35:31 2021 No.13545338 View Reply Original Report

Quoted By:

Hello, /sci/, I have a question. Would a padmounted substation ever be near electrical pylons/transmission towers? Why or why not?

2 posts omitted

Anonymous

Anonymous Sun 22 Aug 2021 01:39:00 No.13546192 Report

Quoted By: >>13546196 >>13546215

>>13546169
Any electricians in here? Also, these transformers do what exactly? C'mon /sci/, one of you has to know.

Anonymous

Anonymous Sun 22 Aug 2021 01:40:11 No.13546196 Report

Quoted By: >>13546202

>>13546192
they wait for the Decepticons

Anonymous

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Anonymous Sun 22 Aug 2021 01:44:18 No.13546202 Report

Quoted By:

>>13546196

Anonymous

Anonymous Sun 22 Aug 2021 01:54:20 No.13546215 Report

Quoted By: >>13546251

>>13546192
>Also, these transformers do what exactly?
uh, transform voltage.

quick run down.
long distance power is almost always high-voltage AC for the following reasons:
1) current flowing in metals causes resistive heating
2) AC currents are mostly confined to near the surface of conducts (aka skin effect, due to resistive losses inside the conductor)
3) power = voltage * current^2
taken together, to transmit some power, you want your voltage to be as high as possible to minimize resistive losses
however, high voltage is dangerous and can't be used in things like home appliances. transformers are used to step voltages down to usable levels. your HV lines will go to a substation, and the substation will distribute power to local sinks. pad mounted transformers further step down the voltage. it's not unusual to see all of these components near each other

Anonymous

Anonymous Sun 22 Aug 2021 02:06:31 No.13546251 Report

Quoted By:

>>13546215
Thanks, anon. I was just going to go out and explore my neighborhood to see if I could find a pair. I probably will still do this but your QRD, saved me time.

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IPCC thread

Anonymous Fri 20 Aug 20:50:02 2021 No.13541625 View Reply Original Report

Quoted By:

22 posts and 17 images omitted

Anonymous

Anonymous Sat 21 Aug 2021 17:52:45 No.13544786 Report

Quoted By:

Even if you fucking hate nuclear, if you believe the IPCC are correct, you should be jumping onto the nuclear bandwagon. Mass produced nuclear powerplants are the only way to get the world off coal and other fossil fuels. South Korea can make them, they can even integrate them into boat hulls for easy moving to target countries in need of cheap, clean power.

Anonymous

Anonymous Sat 21 Aug 2021 20:05:57 No.13545232 Report

Quoted By:

As a climate scientist, honestly there is nothing surprising about IPCC report. They are very conservative and only take established science. Their report are all based on peer reviewed, published papers, which are in themselves can take months to a year to publish with challenging cranky reviewer. Even then they take the cutting edge publications and give them low or medium confidence unless there are additional studies backing and confirming the cutting edge publications. I'm seeing stuff that is reported in AGU, EGU, Goldschmit etc conferences back during my undergraduate days. These are at least 5 years out of date compared to state of science, with exception of some of the CMIP6 ensemble runs and the updated SSPs

Anonymous

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Anonymous Sun 22 Aug 2021 01:57:13 No.13546221 Report

Quoted By:

Theres no fucking point in staring at data, doing studies, and brow beating if you're unwilling to force nations like China, India, places in Africa, etc. to stop polluting. For every single unit of saved pollution in the US or whatever, a place like China is putting out 5 and gaining in magnitude. You're wasting your fucking time on these studies if you want to save the planet or whatever.

Anonymous

Anonymous Sun 22 Aug 2021 02:01:26 No.13546236 Report

Quoted By:

the entire climate debate is just american direction brain retardation. no real solutions are being accepted. redundant thread
/thread

Anonymous

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Anonymous Sun 22 Aug 2021 02:03:45 No.13546244 Report

Quoted By:

>>13543217
>>13543219
>>13543223
>>13543228

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Anonymous Sun 22 Aug 01:30:11 2021 No.13546167 View Reply Original Report

Quoted By:

Glyphosate is a salt that breaks down naturally in the environment.

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itt: we test other Anons mental abilities with whimsical puzzles and tests

Anonymous Sat 21 Aug 19:32:06 2021 No.13545104 View Reply Original Report

Quoted By: >>13546093

A+B=10
A+C=20
B+C=24
A+B+C=?
if you can't solve this neck yourself

31 posts and 2 images omitted

Anonymous

Anonymous Sat 21 Aug 2021 22:25:35 No.13545698 Report

Quoted By: >>13545710

>>13545668
No need for name-calling. This is why you should show your work, otherwise >>13545450 reads as:
>Solve:
>A+B=10
>A+C=20
>B+C=24
>A+B+C=?
>...
>2(A+B+C) = 54
That's a leap.

Anonymous

Anonymous Sat 21 Aug 2021 22:29:43 No.13545710 Report

Quoted By: >>13545721

>>13545698
okay I made that post you're referring to
all I did was notice that ABC were all mentioned twice so I could put them all together in the same equation based on that, then divided it be two
I did omit the rest of my working out and proof

Anonymous

Anonymous Sat 21 Aug 2021 22:34:05 No.13545721 Report

Quoted By:

>>13545710
Alright, we're all cool now :) Thanks!

Anonymous

Anonymous Sun 22 Aug 2021 00:57:55 No.13546093 Report

Quoted By:

>>13545104
>ANY manual labor to solve a linear system
>sum([1 1 0;1 0 1;0 1 1]\[10;20;24])

Anonymous

Anonymous Sun 22 Aug 2021 01:02:13 No.13546105 Report

Quoted By:

>>13545261
agreed, whether you do the clever thing by adding all three equations or just crunch through the linear algebra, this is something you should be able to do before posting some brazen opinion about finitism or defining real numbers or some shit

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Anonymous Sun 22 Aug 00:34:48 2021 No.13546036 View Reply Original Report

Quoted By:

How many women do I need to impregnate to change the gene pool of the human population and make autism a dominant trait?

Anonymous

Anonymous Sun 22 Aug 2021 00:45:33 No.13546069 Report

Quoted By: >>13546082

effectively 0, autismos have the least children yet they increase in numbers.
You see autism can't be a dominant trait or else there will be too many NEET retards who can't function, because the retard NTs do everything for us. We may be the evolution of humanity but we're also inherently parasitic.
Why do you think there are so many political cucks?
because us autismos calculated all of this. We are eternal.

Anonymous

Anonymous Sun 22 Aug 2021 00:52:42 No.13546082 Report

Quoted By: >>13546085 >>13546087

>>13546069
K, let's forget about autism
How many many do i need to force breed to make my genes the majority

Anonymous

Anonymous Sun 22 Aug 2021 00:53:56 No.13546085 Report

Quoted By:

>>13546082
Billions

Ghengis Khan is really the only dude to do what you’re talking about, for reference.

Anonymous

Anonymous Sun 22 Aug 2021 00:54:43 No.13546087 Report

Quoted By: >>13546098

>>13546082
1

Anonymous

Anonymous Sun 22 Aug 2021 00:59:31 No.13546098 Report

Quoted By:

>>13546087
this. the mrca of modern humans probably didn't have a lot of kids, his descendants just did

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Two Speakers Are 150% As Loud As One Speaker

Hysterical american astronaut makes a hole in ISS so she can be sent home

IPCC thread

itt: we test other Anons mental abilities with whimsical puzzles and tests