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08-26-2007, 12:32 AM   #21
darkstar2466
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I got (sin(4)/2 - 1/2) - (sin(-4)/2 + 1/2). I think it's right.

EDIT: F*ck, I forgot to change the bounds of integration. Whatever, it would end up right if I redid it.
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Last edited by darkstar2466 : 08-26-2007 at 12:35 AM.

08-26-2007, 12:32 AM   #22
guywithguitar
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Quote:
 Originally Posted by Zackie EL Bingo.

Haha, guys, it's just the area under half of a unit circle, no math involved.

 08-26-2007, 12:34 AM #23 lounge act      Join Date: Aug 2006 Location: Erie, PA I'll be needing this a lot... You better be telling the truth on the answers! Cus I sure as hell wouldn't be able to tell if you're lying
08-26-2007, 12:34 AM   #24
bigwillie
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Quote:
 Originally Posted by guywithguitar Pi/2?

Which also equals 1.571. Which is what I said.

08-26-2007, 12:34 AM   #25
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Quote:
 Originally Posted by myself101 Ok can someone tell me how to plot those graphs that are like "y=x+2" except they dont tell you x?

im not quite sure what u mean, if u mean as in y=2, then you would just draw a straight line on the y=2 spaces, i.e. (0,2)(1,2)(-1,2) all the way across, so no matter what the x=?, the y=2 always
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08-26-2007, 12:35 AM   #26
guywithguitar
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Quote:
 Originally Posted by bigwillie Which also equals 1.571. Which is what I said.

Yeah, but you actually did the integral .

08-26-2007, 12:36 AM   #27
Zackie EL
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Quote:
 Originally Posted by bigwillie Which also equals 1.571. Which is what I said.

I know, but keep it in radians. Sorry I didn't mention it.

08-26-2007, 12:38 AM   #28
darkstar2466
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Anyone done double/triple or flux/circulation integrals here?
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Quote:
 Originally Posted by denizenz I'll logic you right in the thyroid.

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08-26-2007, 12:39 AM   #29
bigwillie
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Quote:
 Originally Posted by guywithguitar Yeah, but you actually did the integral .

But the long way was much more fun.

Quote:
 Originally Posted by Zackie EL I know, but keep it in radians. Sorry I didn't mention it.

Ah well, it's all good.

08-26-2007, 12:41 AM   #30
fluffylump2
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Join Date: May 2006
Quote:
 Originally Posted by myself101 Ok can someone tell me how to plot those graphs that are like "y=x+2" except they dont tell you x?

y = x+2

your slope is 1/1, and your y-intercept is (0,2). So start at that point and move up one and over one. Plot that point. then move up one and over one. and plot that point. you'll soon see what the line is supposed to look like.

08-26-2007, 12:41 AM   #31
guywithguitar
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Quote:
 Originally Posted by darkstar2466 Anyone done double/triple or flux/circulation integrals here?

I've had one double integral problem ever, and was kind of walked through it, but I think I understand how to do them. But do elaborate on the flux and circulation integrals
.

08-26-2007, 12:44 AM   #32
bigwillie
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Quote:
 Originally Posted by darkstar2466 Anyone done double/triple or flux/circulation integrals here?

I've done a few triples, but I've never heard of the flux/circulation integrals before either.

 08-26-2007, 12:44 AM #33 Zackie EL UG's Machinist     Join Date: Mar 2006 Location: Where?! Ok here's another easy one. This is trig. Give me the area of a triangle with sides a-9.12, b-4.67, c-10.83 and tell me how you did it.
08-26-2007, 12:49 AM   #34
darkstar2466
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Quote:
 Originally Posted by guywithguitar I've had one double integral problem ever, and was kind of walked through it, but I think I understand how to do them. But do elaborate on the flux and circulation integrals .

Flux is the amount of flow over a certain space, so you're usually given a scalar quantity and you integrate over that region to the flow from it. It's usually used for electricity and magnetism. Here's the basic form:

Circulation is similar, except it's over a closed loop and you figure out the integral of the velocity of a fluid or something circulating. Here's the basic form for that:

But before you do that, you must learn line integrals, which is the basis of these.
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Quote:
 Originally Posted by denizenz I'll logic you right in the thyroid.

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 08-26-2007, 12:51 AM #35 guywithguitar Reggie stirred you, sir     Join Date: Jul 2003 Location: Rochester NY. Ah, I'm taking E&M next semester, a.k.a. about a week from now, so I'll be familiar with those soon .
08-26-2007, 12:54 AM   #36
darkstar2466
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Quote:
 Originally Posted by guywithguitar Ah, I'm taking E&M next semester, a.k.a. about a week from now, so I'll be familiar with those soon .

Yea, you should hit these pretty soon. The math series I'm taking does this first, to prepare for E&M, I guess.

What math are you taking?
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 Originally Posted by denizenz I'll logic you right in the thyroid.

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 08-26-2007, 12:56 AM #37 Zoso92 Banned     Join Date: Aug 2007 Location: Abbey Road im a dumbass when it comes to math n science n all school stuff i like music class tho that count?
 08-26-2007, 12:58 AM #38 Zackie EL UG's Machinist     Join Date: Mar 2006 Location: Where?! No answers?
08-26-2007, 01:03 AM   #39
darkstar2466
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Quote:
 Originally Posted by Zackie EL Ok here's another easy one. This is trig. Give me the area of a triangle with sides a-9.12, b-4.67, c-10.83 and tell me how you did it.

Uh, I think I would use law of cosines to get the angle C, facing the hypotenuse c, then I would use the general formula of the triangle area A = 1/2 a * b * sin(C). I don't feel like plugging in the numbers.
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Quote:
 Originally Posted by denizenz I'll logic you right in the thyroid.

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08-26-2007, 01:03 AM   #40
bigwillie
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Quote:
 Originally Posted by Zackie EL Ok here's another easy one. This is trig. Give me the area of a triangle with sides a-9.12, b-4.67, c-10.83 and tell me how you did it.

21.07

I used the Law of Cosines to solve for angle A, (56.436), then solved for the height using sine equals opposite over hypotenuse. Then just basic A=b*h/2.

EDIT: I wrote 27.07, but meant 21.07. I can't even read my own writing.

Last edited by bigwillie : 08-26-2007 at 01:09 AM.

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