What does a mechanical engineer do?
>>7649812
mechanical stuff
>>7649812
Repair work.
Disappoint
How do I compare two acid formulas and find out which is stronger? (For seeing if acid will react with a salt)
Pls help.
>>7649777
compare the H atoms to the OH
the more H a solution has the more acidic
the more OH it has the more basic
then there are chemical buffers that keep things close to 7 but that's for organic chemistry :^)
http://www.shmoop.com/acids-bases/acid-strength.html
>>7649777
You're asking two different questions. Acid strength has to do with its dissociation, and reacting with a salt is just a separate reaction with the conjugate base and the ions of the salt.
How to calculate how far from the surface is a line placed over a circle at its end?
The line's center is over the circle.
Let's asume I know the length of the line and the diameter of the circle.
>line
>center
>length
Anyway could be clearer
do a triple integral over the line
>>7649771
Are you looking for the shortest length to the surface? Or does the green line need to be perpendicular to the pink one?
for a long time my teachers have hammered into my brain that
infinity is not a number, it's just a concept. Now that I understand
that, I wonder if zero is just a concept too? I guess this is both a
philosophical and a mathematical question.
Philosophically, you can't really have a zero of things, because the
thing which is zero doesn't really exist. In fact, if you do count
things that don't really exist, you will have an infinite number of
those things since there is no limit to things that you can imagine
existing (which is rather an interesting fact).
In mathematics, many definitions and rules go haywire when they try
to deal with zero (such as 0^0, 1/0, 0/0). The two most used bounds
for evaluating the limit of a function are in fact 0 and infinity.
So it seems obvious that there is a deep intricate relation between
zero and infinity. And like infinity, it seems that zero should just
be considered a concept. Furthermore, by making zero a concept we
would be able to avoid writing those exceptions to rules where we have
to specify that the equation is true as long as something is not zero.
I just thought of few more examples:
1) If in a game, your opponent has 1 point and you have two points
then you can say that you have twice as many points as him. Whereas
if your opponent has zero points and you have two points, you would
technically have to say that you have infinite times as many points
as him.
2) You can't really have a circle with radius zero.
3) Zero is neither positive nor negative and neither it is even or odd.
Philosophically, almost anything is a concept. The difference in the concrete case is semantics. What your teacher meant is that infinity is not a number in the sense that is not an element of the set of reals (technical math babble); if you draw a number line, you can never reach infinity, but any finite number can in theory be reached (even stupendously large ones). In this sense zero is a number and infinity is not.
While you are right that zero and infinity are very much related, your wording does not make a lot of sense. "By making zero a concept" has no meaning in the mathematical sense, nor does it in the philosophical one.
Your examples:
1) That's ratio's for you.
2) You can, since technically, a circle is defined to be the set of points that have a distance equal to the radius from a certain center point. If this distance is zero, then this set reduces to the set with just the center point in it. (Aka, a point.)
3) I'm not sure what you're aiming at with this one. Besides that zero is quite definitely even.
>he thinks math isn't a concept
>>7649720
>>7649723
Please do not reply to the spam bot. It crawls for various shitty threads and reposts them by random in order to lower the quality of this board.
http://mathforum.org/library/drmath/view/68357.html
Is there a way to increase reaction time?
I was wondering because feel obligated to finish pic related but my reaction time is too slow to deal with the random enemy patterns.
>>7649635
git gud
>>7649635
Juggling. Increases 'Processing speed' like a MUHFUH!
>>7649644
I cant git gud, unless i can increase reaction times.
How and why does the pendulum equation work?
>>7649536
did you try looking up the explanation?
>>7649536
Small angle approximation and dimensional analysis.
T≈2sqrt(L) because π/sqrt(g)≈1
Does /sci/ agree with this 3rd year bio student?
>>7649446
Jesus, everything in the entire field of biology is at a pop sci garbage level of rigour. No fucking wonder only women take it
>>7649446
>3rd year bio student
Let me guess, biology threw out calculus and differential equations out of their curriculum so that now there are no "weeding out" classes.
Literal retards.
And don't think I am overreacting.
That 3rd year bio major may as well be a pre-med bio major and in 2 decades (when he finally gets accepted into med school) he could be the one treating your life threatening disease and at that moment he may "make a mistake with one fact" and kill you.
Seriously, can we pass a law that makes it legal to kill every biology major that does not get accepted into med-school right after graduation?
CONCRETE A SHIT
Scientists have discovered the structure of the material which causes concrete in buildings to break down and crack
Shitty concrete buildings worldwide break down after a few decades because of the alkali-aggregate reaction, AAR.
AAR explained:
1. Concrete's main component = cement
2. Cement contains alkali metals e.g. Na or K
3. Moisture (rain) + alkali metal -> alkaline solution
4. Concrete's 2nd main component = sand and gravel
5. Sand and gravel is composed of minerals like quartz and feldspar, which are silicates
6. Silicates + alkaline water -> alkali calcium silicate hydrates
7. Alkali calcium silicate hydrates absorb more water and expand
8. Cracks this maketh
Scientists have discovered that the alkali calcium silicate hydrates (ACSH) have a crystal, sheet-silicate structure - something which has never before been observed. It was found by taking diffraction pattern readings from wafer thin samples of AAR''d concrete with an x-ray beam 50x thinner than a human hair.
Boffins hope info about the structure of ACSH will help to provide a solution to cracking concrete to make it more durable, perhaps by adding organic material to relieve tension build-up.
Paul Scherrer Institute
Swiss Materials Science Lab Empa
>http://www.sciencedaily.com/releases/2015/11/151105143538.htm
REEEEEEEEEEEEEEEEE
NOOOOOOOOOOOOOOO
NO SOLUTION
JUST STOP BUILDING IN CONCRETE
MFW BEAUTIFUL UNIVERSITY COMPLEX/CAMPUS RUINED BY CONCRETE AND STEEL REEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
I am sure many people on /sci/ have been at universities which have been victims of modern architecture.
Pic related. The modern part and the old part of my old university physics building.
>>7649442
>just stop building in concrete
What do you want them to use?
>>7649457
Granite.
>>7649442
Concrete is fucking ugly anyway, good.
What university has the dumbest name?
My vote goes to Reading University. Do you have to graduate to get into Writing University and Math University?
HARHARHARHARHARHARHARHARHAR
>>7649439
Brown University is racist
>>7649439
Ball State University. Sounds like a place where you can only major in sports or gonad cradling.
http://www.techtimes.com/articles/104167/20151108/seti-researchers-find-no-signs-of-intelligent-alien-life-around-strange-dimming-star-kic-8462852.htm
IT'S OVER ALREADY
NOTHING
THEY FOUND NOTHING
>The findings did not totally rule out the occurrence of alien communications - only that they may be weaker than what SETI is currently able to detect
ayyy lmaos still possible
>There were people seriously expecting aliens
>>7649453
Pls just stop. They're not there or if they are they don't wanna talk to us. Let it go.
Hey!
Sometimes when I do math, I get stuck on some half tricky
problems, and when looking up the answer, I still don't get the "why" if y'all catch my drift. Sometimes I really need to see the solution in order to fully understand the problem.
The question...
* Is there any mathematical service available that offers solutions and answers to the problems provided by the customer (me)?
Been google for a while now without any luck... So you guys are my lost hope.
-Read before answering-
I'm not talking about wolfram alpha or any other programs of that sort, i'm talking about a physical person behind a computer screen who is willing to help people in exchange for money, (no free service like asking in a forum for help)
Can't ask a teacher for help since I don't have one.
- - - - - - - - - - - - - - - - -
Ps. Sorry if there's any grammatical error/s in the text, english is not my primary language :/
Also, help is obviously highly appreciated!
>>7649410
Ask your professor.
>>7649415
Don't have one
>>7649410
I can tutor you on Skype for 50 bucks an hour
All my life, I've been super into animals and the idea of getting some hands-on job with wildlife in the field. Lately, however, whenever I say that I want to get a zoology degree, university graduates and university staff have given me the look one gives to a recruit in the 40's saying that war is going to be an "adventure". What hell have I gotten myself into?
I volunteer at an aquarium, and really enjoy it. Everyone who works there seem to love their jobs. A lot of it for them is field work, going to rescue injured animals or do research or consult on fisheries management.
Anyway, you might try to do something like that? Volunteer or get a summer job with an organization, see if it suits you.
Bottom line is not to listen to other people too much. They're not you, and they don't like the things you like.
I'd typically say you're fucked, but honestly, just start volunteering.
You'll find your place soon, friend.
Just do what you want. If it sucks then bail, but you'll always regret if you didn't give it an honest try.
>Unununium
>111
>un = 1
I cant tell if this is stupid or brilliant
>>7649302
Makes you remember its atomic number, whats the issue?
>>7649302
>TFW they changed it to Roentgenium
>>7649311
>Roentgenium
Fuck that name. Unununium is so much better.
Okay /sci/, I have a question that's been bugging me all day and it's not related to coursework enough for me to ask my lecturer. So here goes:
Assume a scenario where I have a glass of infinite volume and add a 200 ml bottle of Jack Daniel's to the glass, and then proceed to pour water into the the glass for an indefinite amount of time.
At some point, would the concentration of Jack Daniel's become so diluted that it would be completely undetectable in the solution? As in, the Jack Daniel's' concentration has become so diluted that now only the water is detectable?
>>7649253
>At some point, would the concentration of Jack Daniel's become so diluted that it would be completely undetectable in the solution?
Yes, of course.
Think about what it would mean if the opposite were true. Any given sample would have enough molecules of non-water to be detectable as jack. But you've got potentially infinite samples. So that means you must have infinite jack. But you don't. QED
>>7649253
Infinite water has a infinite mass.
At some point the pure mass of the water above the jack daniels will transform the jack daniels into dark matter. This will create a black hole which will suck in all your measuring facilitys
This is now a probability question because you always have a probability of finding the jack daniels particles because there will always be 1 part per N
Will it ever be possible to travel to Pluto in a matter on months instead of years?
yes and no
>>7649081
What do you mean?
I think it's possible with modern technology, might take 15-20 years to get there though at our current speed. That would be a long cold ride probably leave that to the Russians they seem to like chilling in space for long periods of time
![chemistry[1].jpg](https://i.imgur.com/E2H1X41.jpg "chemistry[1]")
![sage[2].jpg](https://i.imgur.com/o7iac19.jpg "sage[2]")
