(b) Using Green's int c x^ 2 ydx

Priya

Priya

Answered question

2022-07-31

(b) Using Green's int c x^ 2 ydx + x ^ 2 * dxy theorem, evaluate where C is the triangle

joining the points (0, 0), (1, 0) and (0, 1).

 

Answer & Explanation

Don Sumner

Don Sumner

Skilled2023-05-23Added 184 answers

To evaluate the line integral āˆ®Cx2ydx+x2dy using Green's theorem, we need to find the vector field š…(x,y) such that š…=Pš¢+Qš£, where P=x2y and Q=x2.
By applying Green's theorem, the line integral can be rewritten as a double integral over the region enclosed by the curve C:
āˆ®Cx2ydx+x2dy=āˆ¬R(āˆ‚Qāˆ‚xāˆ’āˆ‚Pāˆ‚y)dA
where āˆ‚Qāˆ‚x represents the partial derivative of Q with respect to x, and āˆ‚Pāˆ‚y represents the partial derivative of P with respect to y.
Let's calculate these partial derivatives:
āˆ‚Qāˆ‚x=āˆ‚āˆ‚x(x2)=2x
āˆ‚Pāˆ‚y=āˆ‚āˆ‚y(x2y)=x2
Substituting these values into the integral expression, we have:
āˆ¬R(2xāˆ’x2)dA
Now, we need to determine the region R enclosed by the triangle joining the points (0, 0), (1, 0), and (0, 1).
The region R is a right triangle with vertices (0, 0), (1, 0), and (0, 1). We can evaluate the double integral by integrating over this triangular region.
Using the limits of integration, we have:
āˆ¬R(2xāˆ’x2)dA=āˆ«01āˆ«0x(2xāˆ’x2)dydx+āˆ«10āˆ«01āˆ’x(2xāˆ’x2)dydx
Simplifying the integrals, we obtain:
āˆ«01āˆ«0x(2xāˆ’x2)dydx+āˆ«10āˆ«01āˆ’x(2xāˆ’x2)dydx=āˆ«01xyāˆ’x2y2|0x+āˆ«01xyāˆ’x2y2|1āˆ’x0dx
Evaluating the integrals, we get:
āˆ«01xyāˆ’x2y2|0x+āˆ«01xyāˆ’x2y2|1āˆ’x0dx=āˆ«01x2āˆ’x32dx+āˆ«01(1āˆ’x)yāˆ’(1āˆ’x)2y2dx
Simplifying further, we have:
āˆ«01x2āˆ’x32dx+āˆ«01(1āˆ’x)yāˆ’(1āˆ’x)2y2dx=[x33āˆ’x48]01+[y2x2āˆ’y3x3+y6x4]01
Evaluating the limits of integration, we obtain:
[x33āˆ’x48]01+[y2x2āˆ’y3x3+y6x4]01=13āˆ’18+y2āˆ’y3+y6
Simplifying the expression, we have:
13āˆ’18+y2āˆ’y3+y6=1324+y4
Therefore, the value of the line integral āˆ®Cx2ydx+x2dy along the triangle C joining the points (0, 0), (1, 0), and (0, 1) is 1324+y4.

Do you have a similar question?

Recalculate according to your conditions!

Ask your question.
Get an expert answer.

Let our experts help you. Answer in as fast as 15 minutes.

Didn't find what you were looking for?