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#1 Re: Help Me ! » Triple Integration question. Coordinates of Centroid. » 2008-04-03 02:57:05

Gotovina

OOOOOh, I know where I went wrong know. Thanks so much.

#2 Help Me ! » Triple Integration question. Coordinates of Centroid. » 2008-04-02 09:50:56

Gotovina
Replies: 2

Hey guys. I can't seem to figure out this question. Here she is.

Find the coordinates (x(bar), y(bar), z(bar)) of the centroid of the region which lies below the surface


and above the triangular region in the xy-plane enclosed by the straight lines
and

#3 Help Me ! » Anyone know how to use Maplesoft? » 2008-03-30 03:54:44

Gotovina
Replies: 0

I have an assignment to do in Maplesoft, I am not sure how to do some of the questions. Here's one for example.

The position of a particle in space at any time t > 0 (in seconds) is given by
x(t) = 22. 5 e^t, y(t) = 16 cosh(3t), z(t) = 4 sinh(2t) (in meters).

(a) Use the commands diff and fsolve to find the time t when the particle first reach
the speed of 190 m/s.

(b) Use the command eval to find the initial speed of the particle.

anyone got any ideas? I am not sure how to enter it in. Thanks.

#4 Help Me ! » How should I integrate this? » 2008-03-10 10:51:47

Gotovina
Replies: 9

I am guessing integration by parts, but I am stuck.

#5 Re: Help Me ! » Iterated Integral, order reversal » 2008-02-28 15:27:23

Gotovina

anyone?

#6 Help Me ! » Iterated Integral, order reversal » 2008-02-27 10:46:25

Gotovina
Replies: 2

Let  D be a planar region and let

Express the double integral as an iterated integral with the order of integration

reversed.

The question is a sum of two integrals. I am suppose to give the answer as a single double integrals with the order reversed

#7 Re: Help Me ! » Double Integration problem » 2008-02-26 13:38:46

Gotovina

I am still lost, anyone have any ideas?

#8 Re: Help Me ! » Double Integration problem » 2008-02-21 11:29:22

Gotovina

Anyone? I still don't understand what to do.

#9 Re: Help Me ! » Double Integration problem » 2008-02-19 14:45:32

Gotovina

I understand I need to treat Y as a constant if I integrate with respect to X but I am still confused on how to do it. Should I pretend Y is a random number if I integrate w.r.t X?

#10 Help Me ! » Double Integration problem » 2008-02-19 10:10:59

Gotovina
Replies: 4

I am having some troubles with double integration. Mainly with integrating with respect to x and y. This is a problem I have.

where D is a rectangular region described by 0<x<ln(9) and 16<y<32. Are there are tricks that will make integrating easier with more than 1 variable?

#11 Re: Help Me ! » Improper Integral Type 1 » 2008-02-18 07:21:36

Gotovina

Ahhh, I totally forgot about that thanks. So I think the final answer is ln(5/4).

#12 Help Me ! » Improper Integral Type 1 » 2008-02-17 13:18:13

Gotovina
Replies: 2

I am stuck on this question, here she is.

Finally the integral I get is

ln(5x+4) - ln(4x+5)

I am confused on the part where I sub in ∞ into the ln's. I get the form ∞ - ∞, I am not sure what to do with this.

#13 Re: Help Me ! » Integral question » 2008-02-17 12:56:30

Gotovina

I figured it out. up

#14 Help Me ! » Integral question » 2008-02-16 12:49:15

Gotovina
Replies: 3

I am stuck on this integral, not sure how to solve it.

Improper Integral type II. I am not sure how to integrate it.

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