https://www.youtube.com/watch?v=k6N_4jGJADY
Wikipedia says that its density is 0.9 kg/m^3
At sea level and at 15 °C, air has a density of approximately 1.225 kg/m^3
Am I missing something here or is this just Boeing PR fluff?
>>7585806
The metal lattice itself weights 0.9 kg/m3; they're not counting the air between the metal bits, since there's no closed pockets in it.
It's the same reason that when weighing, say, a gold ring, you don't also have to count the air encircled by the band.
>>7585812
his point is that it should float.
>>7585819
And it would, if you filled it with vacuum and enclosed it in a shell of negligible mass so the air couldn't get in.
Post your favourite things out of all the maths you know
>>7585741
mine is the rotation matrix, maybe you should look into it
Fucking triangles
Rational Trigonometry
you guys like Math? i need help with answering these homework questions on the AC Factoring method. if anybody is willing to give me the answers i will be most greatful.
>>7585732
For fuck's sake.
You are not asking for a hint, not even to have us solve one to give you an example of the general method, you are literally asking us to give you the answer.
Fuck you, anonymous poster with clearly no real appreciation for math and science. I hope you fucking fail.
>>7585732
Wut you mean like factoring a polynomial?
Axiom of Choice factoring method? Every surjective function has a right inverse.
Hey /sci/I'm about to present my thesis result to an academic jury and I have no idea how to esthetically present it...
Can you help me with some templates or any advice for it?
BTW my work is about alternative construction materials.
>>7585605
LaTeX
>>7585605
http://web.mit.edu/rsi/www/pdfs/beamer-tutorial.pdf
Good luck with your presentation.
Use the template of you institution of they have one. Use powerpoint if you're not autistic, latex if you are. There are many fine templates in powerpoint, try some out, but keep it simple and readible. Don't put shitloads of text, rather use concise bullet points and diagrams. Tell your audience the topics you are going to discuss and in what order. After each topic show a list of which topics you have covered greyed out and pointing to the next topic you're going to discuss. Hope this helps.
Say a balloon skeleton had negligible mass and a perfectly rigid body, so that it couldn't be deformed in any way. If I vacuumed out all of the air, making the inside a perfect vacuum, would it float? If so, then how much could it pick up relative to its size?
>>7585601
Yep.
It would pick up just as much as the mass of the air displaced
>>7585601
Yes, the concept is called a "vacuum balloon", and it could lift as much weight as the air it displaces. (Minus the weight of the balloon skeleton, of course).
>>7585601
Yes.
About as much as the air displaced by it would weigh, minus the weight of the balloon material. At sea level that's around 1.225 kilograms per cubic meter.
I had a dream that I was in school, turning in my physics homework and Elon Musk was my teacher. He had this face and said that he "really liked this" pointing to my equations and work.
I never really felt motivated to get my degree until that dream. Wow. I really want to just impress this guy. I think that would be one of my life goals.
>>7585485
did u suck his peepee too? :)
>>7585499
I was expecting something like that. No. Im completely comfortable in my sexuality. I just want to be mentored by the modern Tony Stark.
>>7585485
You should tell him that
On twitter
is science and autism the same thing?
>>7585476
wat.
I don't even...I mean, yes.
>>7585476
Of course. This board was called autism & math when it was created. Science and autism are interchangeable terms. Trust me, this is all autismally confirmed.
>>7585476
>are
If i was to boil piss until all the water evaporates, and then i boiled the sludge on the bottom, would it create phosphorus?
https://www.youtube.com/watch?v=GIGOF_In9BM
>>7585463
Nothing?
>>7585463
more like nitrous stuff
>>7585546
well if i was to light the residue would it light on fire like the video?
Can anyone explain or debunk this?
>>7585445
explain or debunk what?
>move further from earth
>moon looks smaller faster than earth looks smaller because the moon itself is smaller
>move far enough to where the moon's silhouette is smaller than the earth's
>position the camera so the earth takes up the while image
There you go, you filthy fucking retard.
>>7585452
Expanding on this it could also be a camera with a different focal length.
A E S T H E T I C
simbli ebik =^)
H O L Y F U C K H O W I S T H A T E V E N P O S S I B L E
goddamit
Bros!!!
I need to know how I can use a convection hearting method for an idea I have.
I have an idea that'd heat up tortilla chips to a restaurant style hot experience....
...I tested my idea out by putting tortilla chips in my convection oven, and sure enough they tasted phenomenal, after putting them inside for 375 degrees Fahrenheit.
....So, how can I take that convection hearing technology and apply it to my picture?
A vaporizer exists that does it too:
http://www.storz-bickel.com/shop_us/en/crafty-portable-app-vaporizer/
You put the marijuana insid, press a button, and it heats up the bud so within 2 minutes you're ready to exhale
How can we do that with this idea?
I'm sorry to be a dick OP but how could making an oven that is generally cylinder shaped possibly have seemed like a new idea to you?
>>7585268
Well this idea doesn't exist, for what I'm imagining it for
OP, as people in your other, still running, thread have stated, what you're looking for is called a toaster
Mine is basically about memorizing a bunch of information and do something with that...
And this happen specially in science & math.
I wonder if in other countries do the same.
Sweden.
Absolutely awful.
Forgot to said, I'm from Panama
>>7585221
It's a bunch of faggots expecting the same piece of paper everyone else gets to elevate them to a upper class pay check.
Their excessive complaining about overpaying and under performing degrees leads to watered down academics and a perpetuation of the first statement.
What should I look out for when I want to get a telescope? What kind do I need to be able to see saturn in a quality of pic related? Do I need a special one if I want to hook up my DSLR onto it, or will pretty much any one do?
>>7585173
You don't need a super powerful telescope to be able to see the planets up until you hit Uranus. Plants are generally the easiest thing to see in the sky right behind the moon and the sun.
>>7585217
Thank you, glad to hear that.
Should I go for a refractor or a reflector? Is getting a used higher model better than a new cheap model or is it not worth the risk / problems of a used one?
I’ll just extend on \frac {foo } {bar } scheme to specify well formed syntactic expressions.
* The declaration of variables is formalized: If \sigma is a sort (as they are called in logic, also called type) and we want to fix the variable x (called term) to be of this sort, we write x: \sigma.
* Rules (one level up in the metalanguage if you will) are written down vertically. The rules "If A and B are syntactically correct sequents, then so is C" is written
\frac {A \ \ \ \ \ \ \ B } {C }
This two dimensional notation initially comes from calculi in Logic.
== Example ==
So for example, if \mathrm {Type } is the most generic type in our system, and we want a theory with the rule that if \sigma and \tau are of type \mathrm {Type }, that then the symbols \sigma \to \tau and \sigma \times \tau also denote types, then we write this is
\frac { \sigma: \mathrm {Type } \ \ \ \ \ \ \ \tau: \mathrm {Type } } { \sigma \to \tau: \mathrm {Type } }
and
\frac { \sigma: \mathrm {Type } \ \ \ \ \ \ \ \tau: \mathrm {Type } } { \sigma \times \tau: \mathrm {Type } }
A merit of this formalization is that makes it hard to end up with wrong expression syntax like ' \land \land P'. We can use typing systems to define syntax for computer programs, or logic, of cookie recipes. For example, if P and Q are propositions and \land means "and", then we could introduce a type of propositions \mathrm {Prop } and formally express a rule how to form more propositions using these symbols:
\frac {P: \mathrm {Prop } \ \ \ \ \ \ \ Q: \mathrm {Prop } } {P \land Q: \mathrm {Prop } }
* Often, we study sequents expressing "Within the type declarations \Gamma (called context) from \Theta we can form \Psi" and this is written \Gamma| \Theta \vdash \Psi. Theta can be any formula and if we don't need any other formula than such a typing judgment \Gamma=x: \sigma, then we just have \Gamma \vdash \Psi.
== More examples ==
The following certainly give sensible expression in arithmetic:
\frac {n: {\mathbb {N } } \ \ \ \ \ \ \ m: {\mathbb {N } } } {n \cdot m: {\mathbb {N } } }
\frac {n: {\mathbb {N }} } {n+1: {\mathbb {N }} }
Or consider
\frac {A=B: \mathrm {Prop } } {B=A: \mathrm {Prop } }
Note, again, that the above is about what constitutes as syntactically correct expression in a logic, while e.g. the statement (A=B) \Rightarrow (A=B) is a statement within the logic itself. Indeed, we will have
\left((A=B) \Rightarrow (A=B) \right): \mathrm {Prop }.
== Even more examples ==
Here is an example for a derivation rule in proof theory. It expresses that if p is a proof for the proposition A \Rightarrow B and if x is a proof for the proposition A, then we can proof that B holds - and this proof is denoted by p \,x
\frac {p:(A \Rightarrow B) \ \ \ \ \ \ \ x:A } {p \,x:B }
Here is an example from category theory.
The following rule expresses that if g is an arrow in the Hom-class { \bf C }[A,B], and if f is an arrow in the Hom-class { \bf C }[B,C], then f \circ g is an arrow in the Hom-class { \bf C }[A,C].
\frac {g: { \bf C }[A,B] \ \ \ \ \ \ \ f: { \bf C }[B,C] } {f \circ g: { \bf C }[A,C] }
Here is an example of the theory //simply type lambda calculus//.
The following rule expresses that if f is a function from D in C, then for all x in D, then f applied to x is in C:
\frac {f:(D \to C) \ \ \ \ \ \ \ x:D } {f \,x:C }
Or more formally still, the following assumes that from a context \Gamma we can define spaces D and C and D \to C and the first two are indeed viewed as domain and codomain.
\frac { \Gamma \vdash f:(D \to C) \ \ \ \ \ \ \ \Gamma \vdash x:D } { \Gamma \vdash f \ x:C }
Remarks (no need to read):
There are type theory with types and terms completely separated. If we let types have a type (like in the example with \mathrm {Type } above), then types are also terms. If types functionally vary over terms we call the system dependently types and if the types vary over other types we have polymorphic types.
The most heavily studied type systems are those for computation. If you define the type former \to and the associated term constructor (lambda-terms) and rewriting rules, you soon get a Turing complete system.
The first lambda-calculus was untyped (just ad hoc constructors for terms) and this can be seen as simple type theory with the requirement ( \sigma \to \sigma) = \sigma.
The first thing one naturally adds after function types are product types \times and unit type 1. This lets you form lists and choose element. The natural categorical model is a
http://en.wikipedia.org/wiki/Cartesian_closed_category.
And then you might add sum types + and the empty type 0.
This way you can merge types and code if-statements.
Old thread:
>>7579704
Any proof that a enslaving virtual reality is not possible?
>>7584830
https://en.wikipedia.org/wiki/Roboethics
>>7584830
WAKE UP JOHN
WE MISS YOU
We don't care about what's not possible. Otherwise we would be talking about unicorns all day.
Now fuck off.