i'll do my scientific best to command your fleet

jtotheizzoe: explore-blog: Yesteryear’s stereotype-defiers:...

Fri, 29 Mar 2013 22:08:38 +0100

explore-blog:

Yesteryear’s stereotype-defiers: Kick-ass vintage public domain photos of women in science.

Rock on, ladies!! Decades of inspiration here.

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Fri, 29 Mar 2013 22:06:50 +0100

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Fri, 29 Mar 2013 22:05:50 +0100

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Fri, 15 Mar 2013 20:49:47 +0100

nevver: 80s perception of film posters

Mon, 25 Feb 2013 17:59:17 +0100

nevver:

80s perception of film posters

pipolaki replied to your post: Nie będzie mojego zderzenia z żelbetową ścianą… ...

Mon, 25 Feb 2013 17:56:04 +0100

pipolaki replied to your post: Nie będzie mojego zderzenia z żelbetową ścianą…

Przerażasz mnie

Siebie też, jestem ostatnią osobą, którą bym posądziła o optymistyczną postawę z gatunku yay go get it gurl! :D Ale taaaaaki fajny semestr mi się szykuje, trudny, ale fajny. A jak u Ciebie?

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Mon, 25 Feb 2013 17:46:46 +0100

Nie będzie mojego zderzenia z żelbetową ścianą wymagań i oczekiwań stawianych przede mną w tym...

Mon, 25 Feb 2013 17:44:00 +0100

Nie będzie mojego zderzenia z żelbetową ścianą wymagań i oczekiwań stawianych przede mną w tym semestrze. Nie. To semestr rozbije się o mnie. O mój uśmiech, poczucie humoru, wygadanie, odwagę, determinację i ogólną likeability. Jestem zmotywowana jak nigdy, czekałam na powrót na uczelnię z niecierpliwością, a nie ze strachem, i póki co wszystko idzie zgodnie z planem. Jeśli tak zostanie do końca tygodnia, potem będzie już tylko z górki. To znaczy nie będzie w sensie wysiłku, jaki będę musiała włożyć, żeby robić wszystko systematycznie i na satysfakcjonującym mnie (mnie, nie kogoś, komu ubzdurałam sobie, że muszę zaimponować) poziomie, ale w każdym innym tak.

Będzie ciężko? Ok. Otóż drogi semestrze, rzucam się na ciebie ze wszystkim co mam, więc nie masz szans. Robienie ciekawych rzeczy z ciekawymi ludźmi pod okiem ciekawych ; ) prowadzących brzmi jak dobry plan na najbliższe 4 miesiące.

A każdemu lektorowi na egzaminach z angielskiego albo każdej nauczycielce z mojego starego liceum, którzy po usłyszeniu odpowiedzi na pytanie, co studiuję i jaki drugi kierunek, odpowiadają z sarkazmem ‘oh, so fascinating’/’arcyciekawe’ (nawet, jeżeli pan lektor jest przeuroczy i zaczyna od ‘what would such a delicate creature do in a nuclear power plant’, a potem stwierdza, że jestem C1, a pani nauczycielka to chyba najważniejsza osoba, którą spotkałam w swoim nastoletnim życiu, no i nauczyła mnie matmy), przesyłam gorące pozdrowienia.

1ucasvb: Better late than never. Happy Valentine’s Day! Here’s...

Sun, 17 Feb 2013 12:39:46 +0100

1ucasvb:

Better late than never. Happy Valentine’s Day!

Here’s a heart’s sine function.

1ucasvb: The familiar trigonometric functions can be...

Sun, 17 Feb 2013 12:37:27 +0100

1ucasvb:

The familiar trigonometric functions can be geometrically derived from a circle. But what if, instead of the circle, we used a regular polygon? In this animation, we see what the “polygonal sine” looks like for the square and the hexagon. The polygon is such that the inscribed circle has radius 1. (There’s a very neat reason for this.) Since these polygons are not perfectly symmetrical like the circle, the function will depend on the orientation of the polygon. More on this subject and derivations of the functions can be found in this other post
Now you can also listen to what these waves sound like

This technique is general for any polar curve. Here’s a heart’s sine function, for instance

anndruyan: Electric Field Due to a Uniformly Charged...

Sun, 17 Feb 2013 12:30:53 +0100

anndruyan:

Electric Field Due to a Uniformly Charged Disk

Perhaps one of the most difficult concepts in general physics is uniformly charged surfaces. Really, I can’t think of anything more rigorous than E&M and complex integration.

Usually with these problem sets we are given the task of finding the E field at a distance and/or the E field when two charges are in the system.

So when given a uniformly charged disk and asked to find the E field at a distant point here’s how we do it:

First we need to divide the disk into flat rings so we can calculate the E field at our point P by adding up all the rings. Each ring will be out at a distance y and will have a radial width of dy.

Next we’ll set up the E field equation E=kQ/r², but write it as dE=kdQ/√(x² + y²).

Now we come to our first tricky part of E field integration; the dQ. When we do these problems we must remember our charge densities - linear, surface, volume; lambda, sigma, and rho respectively.

Linear - lambda, 1 dimension : dQ = λdx

Surface - sigma, 2 dimensions : dQ = σdA

Volume - rho, 3 dimensions : dQ = ρdV

Here, we use sigma and use the relationship dQ = σdA = σ2πydy. All that means is that our charge, dq, is equal to the surface charge density, σ, times the area of the charged concentric ring.

Now that we have our charge set we can look at the x and y components of the E field. If you look at dE_y you’ll see that as you go around the ring there is another y component that cancels each other out. Therefore we only focus on dE_x since the vector sum of dE_ywill add to 0.

Our dE_x= kdQ cosθ /(x² + y²). We use cosθ because on our free-body diagram dE_x is the adjacent-hypotenuse component of dE. Further substitute the dE_xequation by using x/√(x² + y²) for cosθ and 1/4πε for k.

Only thing left to worry about is your trig identities of integration. Take the integral of dE_x from 0 to R and you will find the E field at point P.

eezydeezy: Feels Like We Only Go Backwards - Tame Impala

Wed, 13 Feb 2013 23:06:44 +0100

eezydeezy:

Feels Like We Only Go Backwards - Tame Impala

thebluthcompany: Illustrated Arrested Development Valentine’s...

Wed, 13 Feb 2013 22:59:26 +0100

thebluthcompany:

Illustrated Arrested Development Valentine’s Day Cards

jamesnord: New York from Brooklyn.

Sat, 02 Feb 2013 10:51:04 +0100

jamesnord:

New York from Brooklyn.

commanderspock: northernqueens THE NATIONAL AND ST VINCENT...

Sun, 27 Jan 2013 09:15:23 +0100

commanderspock:

northernqueens

THE NATIONAL AND ST VINCENT SLEEP ALL SUMMER

cold ways kill cool lovers, strange ways we love to suffer, why won’t you fall back in love with me? there ain’t no way we’re gonna find another the way we sleep all summer, so why won’t you fall back in love with me?

For the first time in my life I am completely unable to make an education-related decision and...

Sun, 20 Jan 2013 20:38:05 +0100

For the first time in my life I am completely unable to make an education-related decision and it’s the worst feeling. The deadline for choosing specialization is up tomorrow and I’m as lost as ever. I looked for guidance, I went to profesors who know me really well, probably even like me, and they told me smart things that made me think. Too bad many of those things were opposing. Of course I am aware that when I go to a person who committed their whole life to a certain discipline, they will… well, it’s likely they will speak fondly of said subject. So it didn’t bring me any closer to having any idea what the fuck do I want to do after uni. Hell yes.

wanderlusteurope: Bike riding in Amsterdam

Mon, 14 Jan 2013 08:41:30 +0100

wanderlusteurope:

Bike riding in Amsterdam

patchworkedpeople: Monochrome Yann Tiersen Dominique A...

Mon, 14 Jan 2013 08:41:03 +0100

patchworkedpeople:

Monochrome

Yann Tiersen Dominique A (vocals)

Album: Black Session

nevver: Yeah right.

Sun, 13 Jan 2013 20:18:45 +0100

nevver:

Yeah right.

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Sun, 13 Jan 2013 20:14:48 +0100