• Show Spoilers
• Night Vision

# Let's make a homework help thread!:

Total posts: [1,506]
...
@Deboss, alright, so I'm pretty terrible at this, but I couldn't ignore the guilt of making this thread without actually bothering to contribute to it any longer. Basically, convection is the transfer of heat caused by the movement of particles, both by diffusion, which is the random movement of particles throughout the fluid, and by advection, which is the natural flow of particles throughout the fluid (often because heat affects the movement of particles). Conduction is the transfer of heat from particle to particle, and usually works better in solid substances than fluids. For instance, a spoon being dipped into a hot liquid would be an example of conduction, because the particles of the liquid are interacting with those of the spoon.
I think Bernoulli's principle should help with the fluids. Just saying.

Also, thermodynamics in general should help with the question.

edited 8th Dec '09 9:08:22 PM by Mapi-chan

Our philosophy prof has given us his blessing to be "creative" for our paper about "an intellectual throwdown" between Descartes and Hume. I'm thinking more of a smackdown. A rap battle or something. Free verse. Limericks.

Suggestions?
Have at least one counterverse of each be about how Descartes' all "knowledge can be intrinsic" and have Hume do his big "No way, Big D, it's only from experience!" And some other crap. Have Hume make fun of cartesian graphing. Have Descartes insult Hume's mother. Hume's rebuff? "Yo momma so dumb she can't augment her sense-principles to form the image of a Golden Mountain, yo!"

Obviously I know nothing about rap.

edited 8th Dec '09 9:10:27 PM by Zephid

"I have run 10 miles a day, every day, for 18 years. That's 65,000 miles. A third of the way to the moon. My goal is to run to the moon."
(weaving)
Her philosophy professor probably won't know much about rap either.
155 Tzetze8th Dec 2009 09:31:57 PM from a converted church in Venice, Italy
DUMB
I saw Abraham Lincoln's assassination as a rap battle once and it was pretty much the best thing ever. I don't know much about philosophers or rap, so, good luck.
Need some help with Divergence; a.k.a., how the hell did the formula for del(upside-down delta) D for both cylindrical and spherical coordinate systems get derived. Cartesian is easy; it's just the partial derivatives of each component of the vector.

It's hard to memorize the formulas for the non-Cartesian systems.
157 Deboss11th Dec 2009 01:00:02 PM from Awesomeville Texas
I see the Awesomeness.
Cylinder is based on three things. Radius of length, theta angle from 0, and height. The first two are what give you your circular shape. You can however make these dependent on other parts such as r=10sin(theta) or some such. Then you've got height which tends not to depend on things. With a sphere, you start the same way, r and theta, but add a phi instead of an h. The difference between phi and theta, is that theta goes to 360 while phi goes to 180, both being 360 would result in two spheres on top of each other.
(weaving)
Deboss: I think Mapi-chan knows what cylindrical and spherical coordinates are, just now how to do partial derviative stuff with them.

I don't recall ever having to do div, grad, or curl stuff with cylindrical/spherical coordinates but I can tell you what I can figure out.

Well, the 1/ρ factor in the dφ part of ∇ for cylindrical coordinates is because an infinitesimal(dφ) change in φ leads to a change in x by -ydφ and in y by x&dphi;—this is perpendicular to how a change in ρ increases things but the length is ρdφ.

Basically, this means you can rotate dx and dy such that one direction is dρ and the other is dφ/ρ, and that's why there's a factor of 1/ρ in the equation for the gradient ∇f. Not sure about the divergence stuff; I'll figure that one out in a bit.

edited 11th Dec '09 2:39:08 PM by WilliamWideWeb

I still have to digest this, but thanks! Also, time to study for signals class.
160 Kinkajou12th Dec 2009 08:15:43 PM from you're not your
One Man Army
Speaking of which, can anyone help me understand how to interface assembly language with C? Finals.
"Wait, it's IV. Of course they are. They'd make IV for Dreamcast." - Enlong, on yet another FFIV remake
Ah damn, I can't help you there. I never really understood assembly, partly because of my distaste towards pre third generation programming languages, So Yeah...
162 Kinkajou12th Dec 2009 08:23:02 PM from you're not your
One Man Army
Hahaha. Nevermind, I understand them a bit, but the thing can get a bit Mind Screwy.
"Wait, it's IV. Of course they are. They'd make IV for Dreamcast." - Enlong, on yet another FFIV remake
Yes, it can. I was astounded at how my groupmate programmed our IC chip to cause a bump and go algorithm to be executed for our project 2 sems ago (we put the breadboard and turned it into a UP Ikot jeepney )
164 Kinkajou12th Dec 2009 08:27:12 PM from you're not your
One Man Army
At least we don't have to go in-depth in assembly like the CSE guys.

"Wait, it's IV. Of course they are. They'd make IV for Dreamcast." - Enlong, on yet another FFIV remake
(weaving)
I want to learn assembly sometime just in case I ever have something that needs assembly.
166 Kinkajou12th Dec 2009 08:40:00 PM from you're not your
One Man Army
You probably won't.

And you know about me teaching someone programming, right?
"Wait, it's IV. Of course they are. They'd make IV for Dreamcast." - Enlong, on yet another FFIV remake
167 Tzetze12th Dec 2009 09:36:27 PM from a converted church in Venice, Italy
DUMB
Let's see, what do you use assembly for... extreme optimization usually in video games, operating systems, device drivers, viruses and worms, embedded systems, and that's all I can think of. I should be better at it than I am but it's hard to learn without a class. (I can usually read x86 asm, if not write it.)
168 Kinkajou12th Dec 2009 09:39:16 PM from you're not your
One Man Army
Going through protected mode is fun.
"Wait, it's IV. Of course they are. They'd make IV for Dreamcast." - Enlong, on yet another FFIV remake
Yeah, it's like when I first learned C:

"B-but Java's easier!"

"Try making an OS built on Java. Good luck with the lag."

":|"
170 Kinkajou12th Dec 2009 09:42:05 PM from you're not your
One Man Army
Java is fucking slow.

Fucking interpreters.
"Wait, it's IV. Of course they are. They'd make IV for Dreamcast." - Enlong, on yet another FFIV remake
171 Tzetze12th Dec 2009 09:44:27 PM from a converted church in Venice, Italy
DUMB
You know what's slower? INTERCAL

Actually it might be faster?
Limewire is so resource-consuming I just stopped using it altogether. That's what you get for building an app purely on Java applets.
173 Kinkajou12th Dec 2009 09:48:25 PM from you're not your
One Man Army
Meh, I'm an album guy, so I went for BitTorrent instead.

Also, C++ is better than Java.
"Wait, it's IV. Of course they are. They'd make IV for Dreamcast." - Enlong, on yet another FFIV remake
174 Tzetze12th Dec 2009 09:50:09 PM from a converted church in Venice, Italy
DUMB
Limewire is applets?! Wow. Glad I never used it. Open standards seem better than canonical programs to me, anyway.
^ Yes. So yeah. screw it.

^^ I go for sites like Megaupload or Mediafire if torrenting doesn't have what I want.

Total posts: 1,506
...
http://tvtropes.org/pmwiki/posts.php?discussion=vyn2qtywk16cvwptwsslnaym&page=7