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Archived threads in /sci/ - Science & Math - 804. page

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this question appeared in a freshman calculus course in my university

can you figure out why this question is tricky?
nobody in my university gets this question correct
20 posts and 1 images submitted.
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>>8714570
You have written out that shitter of a question, it was not asked in your uni course.

Come clean anon, just by looking at that I would be highly surprised if it had solutions.
>>
>>8714570
nice try dude. take your homework somewhere else
>>
>>8714570
bait
or you go to a very shitty uni

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well /sci/?
21 posts and 3 images submitted.
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>>8714267
Literally any number
>>
>>8714276
this
https://en.wikipedia.org/wiki/Lagrange_polynomial
>>
>>8714279
Sequences have infinitely many elements. Polynomials can only have finitely many roots. Lagrange polynomials are irrelevant, but the determination of the sequence's next element is completely arbitrary.

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So let me get this straight:
>falcon 9 1.1
>mass: 506,000 kg
>payload: 13,150 kg
>payload/mass fraction: 2.59%

>falcon 9 "FT"
>mass: 549,000 kg
>payload: 22,800 kg
>payload/mass fraction: 4.15%

How the fuck do they get a 60% payload mass fraction improvement just by increasing the thrust of the engines by 29%?
Are they fudging their numbers?
That is the only way this seems even remotely possible.

Falcon 9 "block 5" is supposed to increase the thrust by an additional 11%. Does this mean that it will have a payload capability of 28,000kg (the same as D-IV Heavy)?

Also, how does the payload for Falcon 9 increase by 73% but the payload for Falcon Heavy only increases by 9%? I'm starting to think that there's no reason to believe any of these numbers until they prove them via payload launch.

Can anyone with more knowledge than me on this chime in?
13 posts and 2 images submitted.
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This 13,000kg payload was including reuse
The 22,800kg payload is expendable payload

Though certainly there has been increases in performance
>>
>>8713969
>This 13,000kg payload was including reuse
>The 22,800kg payload is expendable payload
Source?
>>
>>8713973
my ass
I think its untrue actually.

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Has anyone translated the whole human genome DNA/RNA into C programming language yet?
39 posts and 4 images submitted.
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the program would be useless since DNA is just like an encyclopedia filled with genes that tell ribosomes how to make proteins by sequencing different amino acids. Translating it into C would be like getting a recipe on how to make victoria sponge cake and putting it in a car manual. They are completely different and require different tools, different mechanisms, different parts/ingredients, etc.
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>>8713835
You see...that is where the magic really happens. When someone can edit a cake recipe and translate it into a car again.

If no catgirls = 1
make catgirls
>>
Wtf does that mean translate genetic code into DNA ?

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>be me
>in lab class
>given simple instructions in spoken word on how to operate an impedance analyzer by a "lab demonstrator"
>can't visualize what the demonstrator is explaining but too autistic to ask for help
>no written manual or instructions given except a sheet which asks questions
>everyone manages to get good results with their impedance analyzer except me
>fiddle around with the knobs just to pretend I know what I am doing
>turn the gain up to 100 V
>connect capacitor to the probes
>a large spark erupts nearly setting the table on fire
>everyone stops and looks at me
>lab demonstrator screams
>"WTF ARE YOU DOING ANON. I SPECIFICALLY SAID TO TURN THE GAIN UP TO 10V NOT 100V!!!!"

How do I increase my spatial reasoning /sci/? I predict a poor and unfortunate future ahead of me if I cannot visualize instructions given by people who are too cruel to provide instructions.
13 posts and 1 images submitted.
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I've never liked watching someone else do something/talk through it, then expect me do it. I agree its much better to have written instructions.
>>
>>8713627
>lab tech tells you to turn gain to 10V
>you turn it up to 100V
I fail to see what this has to do with spatial reasoning.
>>
>>8713627
>I predict a poor and unfortunate future ahead of me if I cannot visualize instructions given by people who are too cruel to provide instructions.
Who gives a shit about spatial reasoning? You can predict the fucking future, m8.

Olber's Paradox: if the universe is infinitely large and has existed for an infinite period of time, then everywhere you look in the night sky should end in a star.
>look in sky
>there's dark spots
>"well I guess the universe hasn't existed forever, then"

>look again with a really long exposure time
>the dark spots are no longer dark

Why are we sure the universe hasn't existed indefinitely again?
28 posts and 5 images submitted.
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the universe isn't infinitely large nor infinitely old
>>
>>8713575
Do you have any evidence that supports that assertion?

I might claim that the Ultra Deep Field photo supports the hypothesis that the universe is infinitely old and therefore infinitely large, because if you wait long enough you'll expose an image of something very far away. If you wait longer you'll see something even farther away.
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>>8713589
I do. You'll surely arrive at the trivial evidence by thinking it about yourself. Instead of asking stupid questions.

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What's the most realistic way of removing CO2 from the atmosphere?

My idea:

- Pump a huge amount of ocean water into an artificial lake.

- Saturate the lake with fertilizer so that the algae bloom, fixing tons of carbon dioxide from the atmosphere.

- Drain the algae saturated water into an underground aquifer or abandoned mine, removing the carbon from the carbon cycle for millions of years.

This would all have to be huge of course, and solar powered.
56 posts and 7 images submitted.
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>realistic

Planting trees
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>>8713318
I've done research on that and it apparently doesn't work that well. Trees don't take that much carbon.
>>
>>8713318
/thread

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Tell me why i shouldnt go out and buy a 1080 right now
15 posts and 2 images submitted.
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Because you're poor
>>
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>>8712609
but mummy and daddy arent
>>
What's 1080?

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>i'm really smart, i just don't try
62 posts and 4 images submitted.
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Literally everyone thinks that. Work ethic is a huge component of intelligence, if you think you're smart but lazy you're not smart, you're just dumb. Smart people are people who achieve things in life.
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>>8712411
They achieve things because they work hard, things that could be achieved by anyone given enough effort.
>>
>>8712402
Being smart literally just means that you make choices that benefit you.

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Are there any astronomers on /sci/ tonight?
I was wonder whats its like to do astronomy for a career and not just a hobby.
Well?
18 posts and 3 images submitted.
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>>8712319
I think it depends on what you're working on and where.
>>
>>8712319
damn, it was my childhood dream, too bad i live in a shit tier 3rd world european country so to actually be in top tier observatory and see planets with my own eyes is kind a unlikely and it kills me

how many people are there in the world that get to work at these top tier places? 100?
>>
I'm only a PhD student but I'm looking for a postdoc at the moment.

If you love the work it's pretty good. It is stressful, and hugely competitive. Most of my time is spent coding or writing, I'm an observer so I spend my time reducing data. It can be tedious at times if you get bogged down in a project you lose interest in. The good points are that the work can be rewarding, the bad point is the lack of job security. I'm in the market for a postdoc now but I will have to re-apply in a year or two. You do get to travel a bit, I've observed at a couple big telescopes including the AAT and the VLT. I also got to use the Hubble Space Telescope for 14 orbits last cycle.

What are the ceiling and SD of modern IQ test? Been reading a lot of BS about people with IQs 200+ recently.
31 posts and 3 images submitted.
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>>8712068
>web application dev

Jesus Christ, what a way to fall from glory.

>"Hey man I heard you were a software engineer, you must be hitting the 6 figure mark right? Nice man!"
>"Haha yeah dude.. something like this"
>"What languages do you use?"
>"You know... HTML, js..."
>>
>>8712085
I know some web devs into functional programming, respect to those dudes. But regular web dev, nah no thanks.
>>
>>8712068
the number alone is meaningless without knowing the scale being used

stanford-binet is the most popular, and it considers 140+ to be genius, and has standard deviation of 15

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This article from last years introduces a lot of it: http://www.thecanary.co/2016/10/02/results-really-didnt-want-see-key-mecfs-trial-data-released/

Since then, a peer reviewed paper using the data QMUL were forced to release, and slagging off the work of their researchers, has been released: http://undark.org/2016/12/19/british-chronic-fatigue-syndrome-study-faces-yet-debunking

The UK media has been silent on all this though, with the 'Science Media Centre' having been pumping out propoganda in favour of QMUL's researchers, and trying to undermine the patients who had drawn attention to problems with the work, for years.

Some big people will be shamed by this if it goes mainstream in the UK. The current President of the Royal College of Psychiatrists is involved, and he's about to become President of the Royal Society of Medicine. Lots of big insititutions on the wrong side, with a House of Lord debate (that the researchers seem to want to present as harassment!) had a line of the great and good queing up to defend this work, despite clearly not knowing what they were talking about.
17 posts and 2 images submitted.
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this is sincerely too long to read anyone can summarise?
>>
It's useful for the insurance industry & government to be able to claim disabled people can recover, if only they will rehabilitate themselves. The UK government funded poorly designed research from researchers with insurance industry COIs that claimed to find Cognitive Behavoural Therapy and Exercise Therapy allowed mnay patients with ME.CFS to recover (figures given varied from 40%-22%).

However, even ignoring the problems with trial design, they had spun their data. A patient fought a long legal campaign (which the researchers attempted to present as a form of harassment) to force the release of trial data. He won the case, and the data revealed that treatment did with CBT/exercise did not lead to a significantly greater chance of recovery (according to the QMUL researcher's pre-specified recovery criteria) than a control group that had no additional treatment.

This is one of those stories where the more you read into the details, the more interesting it becomes. The way in which the researchers spun their results, and then ran a campaign attacking patients for attacking their work, is worrying. Even now that lots of US researchers are criticising them, they still might get away with it as UK academia is so founded on personal networks.

The Undark article above is a short one.

This is another lengthy piece I'm afraid: http://www.centreforwelfarereform.org/news/major-breaktn-pace-trial/00296.html
>>
That last piece has a quote from Trevor Butterworth, direcotr of Sense About Science USA:

"PACE is turning out to be the science controversy of the decade: it indicts the medical ecosystem of review"

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Autistic Savant to get a Nobel Prize in tier:

1(tie). Theoretical Partical Physics
1(tie). Pure Maths
1(tie). Macroeconomics
1(tie). Psychology/Neurobiology/Neurology/Neuropsychology/etc.

Better have a PhD to understand anything about this field tier:

99. Computer Science (Machine learning, A.I., etc.)
999: Pure Chemistry
9999(tie). Evolutionary Biology
9999(tie). Genetics

You can literally teach yourself this shit tier

99999. History
999999. Political Science

This shit will take you forever to do research on because of the thousands of hours of reading and sifting through data you have to do tier

9999999. Art History
99999999999999999999999999999999. English
999999999999999999999999999999999999999999999999999999999999999999. Astronomy
38 posts and 3 images submitted.
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Theoretical Partical Physics

I wouldn't say it's too difficult. Math is harder overall.
>>
>>8711768
Nobody cares
>>
>>8711768
>99. Computer Science...
No. Please, don't make laugh.
The amount of idiots who are able to comprehend this is astounding.
There are some intelligent people drawn to the field, but they are just drawn, and generally not challenged (unless, of course, they are specifically dealing with the Mathematics areas/Data Structures/the such. Easiest subject to study as long as you don't plan on writing your own protocols or innovating.)

t. someone switched from CS because of how fucking boring and easy it was (not to mention all the stupid people).

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What if a single atom were to hit you at 99% of the speed of light? would it vaporize you?
36 posts and 1 images submitted.
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>>8711531
A regular hydrogen atom
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>>8711531
It would be very painful.
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>>8711541
for you

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>no /sci/ humor/ylyl thread
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>>8705077
Ok, mathfags, excuse my brainlet question, but how the fuck can 1+2+3+4.... not equal 1+1+1+1....? Any number is a sum of some number of 1s, so it's just the same thing rearranged a bit, no?

How is the -1/12 thing derived?
>>
>>8705843
https://www.youtube.com/watch?v=w-I6XTVZXww

This is simplified but they link to a more hardened proof. Note that it doesn't actually "equal" -1/12 because it doesn't converge, but it is intimately related to -1/12.

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