Why not make new water towers taller than needed and use them for pumped storage hydroelectricity?
Because the water has to be pumped up there in the first place
>>7717837
Liquid water flow has terrible efficiency and there are countless better ways to store energy.
Look up Dinorwig power station. It pumps water up at night during cheap rates and releases the water during the day to meet peak power demands.
Hi /sci/, /tg/ here
Math question; mostly because I'm too dumb to remember how binomials work. Not that I was ever particularly good at those in high school to begin with..
How do I find out how many six-sided dice you roll on average before you've rolled one number twice? (looking for 1, but which number it is shouldn't matter for the math afaik)
The answer to the problem itself would also be greatly appreciated.
Hint: If you rolled seven six-sided dice, what is the likelihood they will all show different numbers?
>>7717636
You're not using a binomial distribution to solve this.. You're using a geometric distribution..
Let's suppose you roll:
[math] X=i [/math] for some i = 1,2,3,4,5,6
Then the question you want to know is how many times should I roll on average to get another i?
Well, assuming the die is fair:
[math] P(X=i) = \frac{1}{6} [/math] so
[math] P(X \neq i) = 1 - \frac{1}{6} = \frac{5}{6} [/math].
The geometric distribution models the number of times an experiment must be performed until a condition called success occurs.. Naturally, our success condition will be [math] X=i [/math]. That this occurs in k attempts is modeled by:
[math] p(k) = (\frac{5}{6})^{k-1}(\frac{1}{6}) \text{ for } k=1,2,3,...[/math]
Compute the expected value of this distribution, or look it up.
>>7717678
I need to correct this I think..
I believe [math] k = 0,1,2,3,... [/math]..
Sorry.. I'm just waking up.
>only 26% of kids pass elementary "linear"/1st-order single variable algebra
Shit teachers I guess.
>>7717607
Oh wait
>https://www.washingtonpost.com/local/education/steep-rates-of-failure-on-algebra-exams-in-montgomery-lead-to-mass-recalculation/2014/06/28/f75eeaf2-fe4c-11e3-932c-0a55b81f48ce_story.html
>Montgomery County’s failure rate for the June final exam in Algebra 1 was so steep — 82 percent for high school students — that district officials say they decided to add 15 percentage points to all test grades, recalculate scores and reprint thousands of report cards.
I stand corrected - only 18% passed
>>7717607
>Alabama
No surprise there.
How much faster do females mature than males?
How is this even measured?
>>7717576
fuck off with your psudo-facts normie
>>7717584
Don't be a penne.
>>7717585
I prefer rigatoni
In regards to career flexibility, pay, job security, and available jobs out there, what is best, a degree in Pure Maths, Statistics, or Actuarial Science?
>>7717491
Mechanical Engineering
>>7717503
Nice meme!
>>7717510
Don't be a penne.
Is humanity still evolving?
What environmental pressures are on us now?
>>7717456
>What environmental pressures are on us now?
Alien invasions destroying civilization.
I'm talking, of course, about shitskins.
We are already devolving.
>>7717456
>Is humanity still evolving?
Yes.
>What environmental pressures are on us now?
In most regions, barely any beyond the most base forms of intelligence. The only thing keeping this grand machine halfway functional is sexual selection. Women and men who are either intelligent enough, or hardwired with a bias towards choosing partners who are highly functioning.
If I compile a computer program (say written in C#), what does actually physically happen on the harddrive and how is this achieved? Some physical elements must be switched right?
(I'm thinking about this in part because I want to know why people are coming up with programming languages for quantum computers now, what it means to set up the computer and how it's eventually done.
But this thread is only about the first question above.)
>>7717455
>what does actually physically happen on the harddrive
The hard drive stores the data for the program. Processing occurs in the CPU. A program may or may not write data back to the hard drive (i.e., saving a file), but the program data itself generally remains intact.
>dumbest question
>mentions C#
Your human readable code is compiled into a binary code composed of machine commands that the CPU can interpret.
This code is a stored as a data file on your HD, which means either as magnetic charges or whatever SSDs use nowadays.
Wendelstein?
Wendelstein!
Will we ever get a fusion reactor which actually produces energy?
>>7717684
we allready have.
are there openly accessible plans/Cad files? i'd like to build a model of that some time in my life.
Can please anyone link me to the huge calculus books thread which was going on here a few days back. I could not find it in the archives. Thank you.
>>7717348
>>7653912
https://warosu.org/sci/thread/S7653912
>>7717352
>https://warosu.org/sci/thread/S7653912
Thank you anon.
Did anybody go through the last versions of Anton's textbook on calculus here? How would you rate the difficulty of its problem set from 0 to 10 (and comparing with Apostol and Courant's textbooks)?
is it possible to melt a steel beam using jet fuel?
Absolutely not.
Jet fuel does not melt steel beams, however it can easily turn 200,000 tons of structural steel and concrete into a fine powder from the top down as well as laterally ejecting steel debris hundreds of meters.
>>7717212
How?
I hear a lot about the negatives of global warming. What are the positives? Is it really end of the world, or end of the polar bears?
>inb4 more bikini's
>>7716919
More habitat, rain fall, fresh water, it's great for agriculture, and rainforests
>>7716919
> implying that polar bears going extinct would be a bad thing
Who here is /physicsengineer/? Is it a meme degree?
>>7716734
>getting a meme degree
>>7716739
>not going to MIT for engineering physics
>>7716746
Literally go kill yourself, kid.
Hey /sci/ whats so fascinating about Pi exactly?
somewhere within pi it says "you're a faggot"
It's like fractals or some shit
Sci seems to be populated by very smart individuals. Can you guys give me reading material that will make me as smart as you? I want to be a genius.
>>7716662
With graph theory you can illustrate any knowledge or thought session
http://aleph0.clarku.edu/~djoyce/java/elements/bookI/bookI.html#defs
just read, baby
Go to a university and read the books your classes require and then asks for suggestions from your professors
Are there any other fellow cornellians on /sci/ who were present this morning to hear Neil Degrasse Tyson say this?
Seriously, WHAT THE FUCK? It sounded like some random gang related bullshit. Has he been taking drugs recently? Is he okay? I didn't even believe it until I saw the video. Why haven't more people reacted to it?
Post the video.
>>7716551
he wont cuz its bullshit, but still i had a great laugh when reading this shit and looking at Smokes face
>>7716544
9/10
Good job.
