Answer Integral of F over C: Calculating dA

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Homework Help Overview

The discussion revolves around evaluating the line integral of a vector field \(\vec{F}\) over a specified path \(C\), which is a rectangle in three-dimensional space. The vector field is defined as \(\vec{F} = (z - y)\vec{i} + (x - z)\vec{j} + (y - x)\vec{k}\), and the rectangle is oriented in a specific manner on the plane defined by the equation \(x + y + z = 27\).

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the computation of the curl of the vector field and its implications for the circulation around the rectangle. There are questions about the correct expression for \(dA\) and the interpretation of the area of the rectangle in relation to the integral.

Discussion Status

Some participants have provided guidance regarding the relationship between the curl and the area of the rectangle, suggesting that the circulation can be calculated using the area. However, there is uncertainty about the correctness of the computed values and the final answer, indicating that the discussion is ongoing.

Contextual Notes

There are indications of missing information or potential misunderstandings in the original problem statement, as participants have pointed out the need for clarity and completeness in the question posed by the original poster.

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Homework Statement



Let [tex]\vec{F} = (z - y)\vec{i} + (x - z)\vec{j} + (y - x)\vec{k}[/tex] . Let C be the rectangle of width 2 and length 5 centered at (9, 9, 9) on the plane x + y + z = 27, oriented clockwise when viewed from the origin.

[tex]\int\limits_C \vec{F} d\vec{r}[/tex] ?

Homework Equations


The Attempt at a Solution



I've already computed the curl F and so now I need to solve the dA. What is the dA here?
 
Last edited:
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anyone??
 
Do you mean F = (z - y)i + (x - z)j + (y - x)k? Also, please write out the question completely; don't make us guess. You did this in another recent thread too where you left out an important part of the question because you "didn't think it was relevant".
 
yes, sorry.. I've edited it now
 
You should get a constant vector of length 2 for the curl. Did you? It is also perpendicular to the rectangle and pointing outwards, so the circulation is just 2(area of rectangle).
 
you mean [tex]\int\limits_C \vec{F} d\vec{r} = 20[/tex] ?
 
CFdr = 2 x (area of rectangle) = 2 x 10 = 20.
 
hmm.. the answer is wrong for some reason
 
Oops, sorry. The magnitude of the curl is √(2² + 2² + 2²) = √12. So the circulation is (√12)(10).
 

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