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<a https://www.thestudentroom.co.uk/showthread.php?t=7467335'> Year 12s: what will be the first way you research your future options? >>

Surace integrals

Anyone know how to do 13 or 40?
amv.png176.0KB
Reply 1
Avatar for naxiv
naxiv
3
We do indeed. Were's your workings??
Reply 2
Avatar for TeeEm
TeeEm
19
Original post by CammieInfinity
Anyone know how to do 13 or 40?


i can help you but I am teaching until 21.30
Reply 3
Avatar for Phichi
Phichi
11
Original post by CammieInfinity
Anyone know how to do 13 or 40?


Did you intend to give all the stalkers on the internet your full name :P?
Reply 4
Avatar for TeeEm
TeeEm
19
Original post by CammieInfinity
Anyone know how to do 13 or 40?


I am not sure what type of help you expect but if look at the link

http://www.madasmaths.com/archive/maths_booklets/advanced_topics/surface_integrals.pdf

a similar example to your Q13 is on page 23.


PS
I cannot see a Q40 in your attachment
Original post by CammieInfinity
Anyone know how to do 13 or 40?


You can follow the general procedure I described in this post, making appropriate changes for your surface and region of integration.
Original post by TeeEm
I am not sure what type of help you expect but if look at the link

http://www.madasmaths.com/archive/maths_booklets/advanced_topics/surface_integrals.pdf

a similar example to your Q13 is on page 23.


PS
I cannot see a Q40 in your attachment


I meant 13 or 20

P.s your link only goes up to p21 but I thought the one on q19 was similair? it's the z=2x-y that is throwing me off :s-smilie:
(edited 9 years ago)
Original post by Phichi
Did you intend to give all the stalkers on the internet your full name :P?



I don't think internet stalkers are interested in my maths problems :tongue:
Reply 8
Avatar for TeeEm
TeeEm
19
Original post by CammieInfinity
I meant 13 or 20

P.s your link only goes up to p21 but I thought the one on q19 was similair? it's the z=2x-y that is throwing me off :s-smilie:


the link is working fine
try again
Original post by CammieInfinity
I meant 13 or 20

P.s your link only goes up to p21 but I thought the one on q19 was similair? it's the z=2x-y that is throwing me off :s-smilie:


I only see 21 pages too.

It would be easier to help you if you put up some working or explained in more detail what you are unable to do.
Original post by atsruser
I only see 21 pages too.

It would be easier to help you if you put up some working or explained in more detail what you are unable to do.


I found the correct link on the post you made on another thread.

http://madasmaths.com/archive/maths_booklets/advanced_topics/vector_integrals.pdf

In your example I don't know how you found k? I will write out my working from your example and post it
Original post by CammieInfinity
I found the correct link on the post you made on another thread.

http://madasmaths.com/archive/maths_booklets/advanced_topics/vector_integrals.pdf

In your example I don't know how you found k? I will write out my working from your example and post it


I'm not sure which example you're talking about here.

In the post that I pointed you to, k\bold{k} is simply the usual unit basis vector in the z-direction, as in i,j,k\bold{i}, \bold{j}, \bold{k}
Not sure about k and if the limit of x should be 0 to 1 or 0 to 2 because if y can only reach 2 and y=2x then x can only go to 1?
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Original post by CammieInfinity
Not sure about k and if the limit of x should be 0 to 1 or 0 to 2 because if y can only reach 2 and y=2x then x can only go to 1?


To compute the flux over the given region, your limits should be ∫y=0y=2∫x=0x=2⋯ dx dy\int_{y=0}^{y=2} \int_{x=0}^{x=2} \cdots \ dx \ dy.

Some contribution to the integral will come from regions of the plane with -ve z. I think your limits will only find the contribution from +ve z.
Reply 14
Avatar for TeeEm
TeeEm
19
Original post by CammieInfinity
I meant 13 or 20

P.s your link only goes up to p21 but I thought the one on q19 was similair? it's the z=2x-y that is throwing me off :s-smilie:


for a similar question to your Q20 look at

page 26 page 27 on

http://www.madasmaths.com/archive/maths_booklets/advanced_topics/big_integral_theorems.pdf

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