Solid bounded by different region

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    Bounded Solid
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Homework Help Overview

The discussion revolves around evaluating the volume of a solid defined by a sphere and a cylindrical boundary. The sphere is described by the equation \(x^2 + y^2 + z^2 = 9\), while the cylindrical boundary is given by \(x^2 + y^2 = 4x\). Participants are attempting to visualize the solid formed by these boundaries.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are sketching diagrams to understand the solid's boundaries but express confusion about the correct interpretation of the problem statement, particularly regarding whether the solid is above or below the sphere. There are discussions about the limits of integration and the need for clarity on the solid's bottom boundary.

Discussion Status

Multiple interpretations of the problem are being explored, with participants questioning the wording and its implications. Some have provided sketches to aid understanding, while others have pointed out inaccuracies in these diagrams. Guidance has been offered regarding the need for clearer visual representations of the solid in relation to the sphere and cylinder.

Contextual Notes

Participants are working under the constraints of the problem statement, which has been identified as potentially confusing. There is an ongoing discussion about the limits of the solid, particularly whether it is bounded below by the sphere or extends infinitely in that direction.

  • #31
I think you need some face-to-face time with your teacher. I gather that English isn't your first language, but still, you don't seem to be understanding anything we are trying to tell you.
 
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  • #32
LCKurtz said:
I think you need some face-to-face time with your teacher. I gather that English isn't your first language, but still, you don't seem to be understanding anything we are trying to tell you.
I agree completely. We are more than 30 posts into this problem, and you still don't understand what the solid looks like, despite multiple graphs and explanations from LCKurtz and me.
 
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  • #33
LCKurtz said:
I think you need some face-to-face time with your teacher. I gather that English isn't your first language, but still, you don't seem to be understanding anything we are trying to tell you.
sorry , after looking it carefully ,the solid formed is the red part ? (refer to the attachment)
So , the red part represent the projection to xy plane ?
 

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  • #34
here's my latest working . I use xy plane projection
 

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  • #35
You have errors in your work. But you are supposed to do it in cylindrical coordinates anyway. You need ##dz,~dr,~d\theta## variables in your integrals.
 

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