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Math Help - URGENT !!! need help with these 3 integrals problems

  1. #1
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    Exclamation URGENT !!! need help with these 3 integrals problems

    Hi, I need urgent help with these 3 integrals problems ... been stuck on the questions and the deadline is Friday. Thanks a lot !


    1) For the green's theorem,


    URGENT !!! need help with these 3 integrals problems-green.jpg

    I got the answer : 18.684. Not sure whether it is correct. Please kindly explain in steps so I know where I went wrong.



    2) I'm totally unsure about finding the surface integral. How do I know the shape of the surface ?

    URGENT !!! need help with these 3 integrals problems-surface-integral.jpg


    3) and finding the curl function f

    URGENT !!! need help with these 3 integrals problems-curl.jpg.

    All I know is, it has something to do with curl. Something like F = grad f.


    Thanks again !
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  2. #2
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    Here is the first one.
    Attached Thumbnails Attached Thumbnails URGENT !!! need help with these 3 integrals problems-picture15.gif  
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  3. #3
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    Here is a response to 3.
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  4. #4
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    I am confused about 2).

    I think you mean,

    S:x^2+y^2=z^2

    Not a^2.

    Since a, z are located next to each other on a standard keyboard.
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  5. #5
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    Red face

    Quote Originally Posted by ThePerfectHacker View Post
    Here is a response to 3.
    Hi, Thanks a lot for your quick reply. I think I'm required to find a function f that satisfy the given theorem. I'm pretty confused about the question too.
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  6. #6
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    Red face

    Quote Originally Posted by ThePerfectHacker View Post
    I am confused about 2).

    I think you mean,

    S:x^2+y^2=z^2

    Not a^2.

    Since a, z are located next to each other on a standard keyboard.

    It is a^2. It stands for radius for example, in the parametric equation : x^2 + y^2 + z^2 - a^2 = 0 where a is the radius with centre 0.
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