Finding the Normal Vector for a Triangle in the Plane Using Stoke's Theorem

In summary, to solve the problem, you will need to use the formula ∫C∫curl F \bullet \vec{n}, and find the vector n using the function g(x,y) = -2x - y + 4. The resulting vector n is < -2, -1, 1>. The final answer is 4/3.
  • #1
aaronfue
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Homework Statement



Let C be the oriented triangle lying in the plane 2x+y+z=4. Evaluate ∫
[itex]_{C}[/itex] F*dr where F(x,y,z)=y2i + z - xk.

Homework Equations



I will be using ∫C∫curl F [itex]\bullet[/itex] [itex]\vec{n}[/itex] to solve this problem. But when I'm trying to find [itex]\vec{n}[/itex] using -gxi - gyj + k, I get

Using g(x,y)= -2x -y + 4
[itex]\vec{n}[/itex] = < -2, -1, 1>

Did I do that correctly? Will the k just be 1 or 4?

My final answer was 4/3?
 
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  • #2
aaronfue said:

Homework Statement



Let C be the oriented triangle lying in the plane 2x+y+z=4. Evaluate ∫
[itex]_{C}[/itex] F*dr where F(x,y,z)=y2i + z - xk.

Homework Equations



I will be using ∫C∫curl F [itex]\bullet[/itex] [itex]\vec{n}[/itex] to solve this problem. But when I'm trying to find [itex]\vec{n}[/itex] using -gxi - gyj + k, I get

Using g(x,y)= -2x -y + 4
[itex]\vec{n}[/itex] = < -2, -1, 1>

Did I do that correctly? Will the k just be 1 or 4?

My final answer was 4/3?

But gx=(-2) so -gx=2. Why are you writing <-2,-1,1>? Shouldn't it be <2,1,1>?
 

FAQ: Finding the Normal Vector for a Triangle in the Plane Using Stoke's Theorem

What is Stoke's Theorem triangle?

Stoke's Theorem triangle is a mathematical theorem that relates the surface integral of a vector field over a surface to a line integral of the vector field around the boundary of the surface.

What is the formula for Stoke's Theorem triangle?

The formula for Stoke's Theorem triangle is ∫∫S(∇×F) · dS = ∫CF · dr, where S is the surface, C is the boundary curve of S, F is the vector field, and ∇×F is the curl of F.

What is the significance of Stoke's Theorem triangle?

Stoke's Theorem triangle is significant because it provides a way to evaluate surface integrals through the use of line integrals, making it easier to solve complex problems in vector calculus.

What is the relationship between Stoke's Theorem triangle and Green's Theorem?

Stoke's Theorem triangle is a generalization of Green's Theorem, which relates the line integral of a two-dimensional vector field to a double integral over the region enclosed by the curve. Green's Theorem can be derived from Stoke's Theorem triangle by setting the surface to be a flat plane.

What are some practical applications of Stoke's Theorem triangle?

Stoke's Theorem triangle has many practical applications in fields such as physics, engineering, and fluid dynamics. It is used to calculate work done by a force, flow of a fluid through a surface, and electric and magnetic fields.

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