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Calculus: Early Transcendentals

8th Edition
James Stewart
ISBN: 9781285741550

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BuyFindarrow_forward

Calculus: Early Transcendentals

8th Edition
James Stewart
ISBN: 9781285741550
Textbook Problem

Use the method of Example 5 to calculate ∫C F · dr, where

F ( x , y ) = 2 x y   i +   ( y 2 x 2 )   j ( x 2 + y 2 ) 2

and C is any positively oriented simple closed curve that encloses the origin.

To determine

To find: The line integral of vector field F(x,y)=2xyi+(y2x2)j(x2+y2)2 over curve C CFdr .

Explanation

Given data:

The given vector field is,

F(x,y)=2xyi+(y2x2)j(x2+y2)2

Formula used:

Green’s Theorem:

Consider a positively oriented curve C which is piece-wise smooth, simple closed curve in plane with domain D. Then,

CFdr=D(QxPy)dA (1)

Here,

Py is continuous first-order partial derivative of P,

Qx is continuous first-order partial derivative of Q, and

P and Q have continuous partial derivatives.

Write the expression for circle with center origin.

x2+y2=r2

Here,

r is radius.

Refer to Figure 11 in the textbook of section 16.4 for region D.

Consider a curve C , which is a circle r(t)=acosti+asintj,0t2π with counter-clockwise orientation centered at origin and radius a. The radius a is small and lies inside the circle C. The region between the circles C and C is D as shown in Figure 11.

The curve C is positively oriented, piecewise-smooth, and simply closed curve with domain D and hence Green’s theorem is applicable.

Compare the two expressions CPdx+Qdy and 2xyi+(y2x2)j(x2+y2)2 .

P=2xy(x2+y2)2Q=y2x2(x2+y2)2

Find the value of Py .

Py=y(2xy(x2+y2)2)=(y(2xy))(x2+y2)2(2xy)y((x2+y2)2)((x2+y2)2)2{t(uv)=uvuvv2}=(2x(1))(x2+y2)2(2xy)(2(x2+y2)(0+2y))(x2+y2)4{t(k)=0,t(t)=1,t(tn)=ntn1}=2x(x2+y2)28xy2(x2+y2)(x2+y2)4

Take common term outside in the numerator.

Py=2x(x2+y2)(x2+y24y2)(x2+y2)4=2x(x23y2)(x2+y2)3=2x36xy2(x2+y2)3

Find the value of Qx .

Qx=x(y2x2(x2+y2)2)=(x(y2x2))(x2+y2)2(y2x2)x((x2+y2)2)((x2+y2)2)2{t(uv)=uvuvv2}=(02x)(x2+y2)2(y2x2)(2(x2+y2)(2x+0))(x2+y2)4{t(k)=0,t(t)=1,t(tn)=ntn1}=2x(x2+y2)24x(y2x2)(x2+y2)(x2+y2)4

Qx=2x(x2+y2)24x(y2x2)(x2+y2)(x2+y2)4=2(x2+y2)(x3xy22xy2+2x3)(x2+y2)4=2(x33xy2)(x2+y2)3=2x36xy2(x2+y2)3

Substitute 2x36xy2(x2+y2)3 for Py and 2x36xy2(x2+y2)3 for Qx in equation (1),

CFdr=D(2x36xy2(x2+y2)32x36xy2(x2+y2)3)dA=D0dA=0

Find the value of F(r)

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Chapter 16 Solutions

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Sect-16.1 P-11ESect-16.1 P-12ESect-16.1 P-13ESect-16.1 P-14ESect-16.1 P-15ESect-16.1 P-16ESect-16.1 P-17ESect-16.1 P-18ESect-16.1 P-21ESect-16.1 P-22ESect-16.1 P-23ESect-16.1 P-24ESect-16.1 P-25ESect-16.1 P-26ESect-16.1 P-29ESect-16.1 P-30ESect-16.1 P-31ESect-16.1 P-32ESect-16.1 P-33ESect-16.1 P-34ESect-16.1 P-35ESect-16.1 P-36ESect-16.2 P-1ESect-16.2 P-2ESect-16.2 P-3ESect-16.2 P-4ESect-16.2 P-5ESect-16.2 P-6ESect-16.2 P-7ESect-16.2 P-8ESect-16.2 P-9ESect-16.2 P-10ESect-16.2 P-11ESect-16.2 P-12ESect-16.2 P-13ESect-16.2 P-14ESect-16.2 P-15ESect-16.2 P-16ESect-16.2 P-17ESect-16.2 P-18ESect-16.2 P-19ESect-16.2 P-20ESect-16.2 P-21ESect-16.2 P-22ESect-16.2 P-23ESect-16.2 P-24ESect-16.2 P-25ESect-16.2 P-26ESect-16.2 P-31ESect-16.2 P-32ESect-16.2 P-33ESect-16.2 P-34ESect-16.2 P-35ESect-16.2 P-36ESect-16.2 P-37ESect-16.2 P-38ESect-16.2 P-39ESect-16.2 P-40ESect-16.2 P-41ESect-16.2 P-42ESect-16.2 P-43ESect-16.2 P-44ESect-16.2 P-45ESect-16.2 P-46ESect-16.2 P-47ESect-16.2 P-48ESect-16.2 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P-40ESect-16.6 P-41ESect-16.6 P-42ESect-16.6 P-43ESect-16.6 P-44ESect-16.6 P-45ESect-16.6 P-46ESect-16.6 P-47ESect-16.6 P-48ESect-16.6 P-49ESect-16.6 P-50ESect-16.6 P-51ESect-16.6 P-52ESect-16.6 P-53ESect-16.6 P-54ESect-16.6 P-56ESect-16.6 P-59ESect-16.6 P-60ESect-16.6 P-61ESect-16.6 P-62ESect-16.6 P-63ESect-16.7 P-1ESect-16.7 P-2ESect-16.7 P-3ESect-16.7 P-4ESect-16.7 P-5ESect-16.7 P-6ESect-16.7 P-7ESect-16.7 P-8ESect-16.7 P-9ESect-16.7 P-10ESect-16.7 P-11ESect-16.7 P-12ESect-16.7 P-13ESect-16.7 P-14ESect-16.7 P-15ESect-16.7 P-16ESect-16.7 P-17ESect-16.7 P-18ESect-16.7 P-19ESect-16.7 P-20ESect-16.7 P-21ESect-16.7 P-22ESect-16.7 P-23ESect-16.7 P-24ESect-16.7 P-25ESect-16.7 P-26ESect-16.7 P-28ESect-16.7 P-37ESect-16.7 P-38ESect-16.7 P-39ESect-16.7 P-40ESect-16.7 P-41ESect-16.7 P-42ESect-16.7 P-43ESect-16.7 P-44ESect-16.7 P-45ESect-16.7 P-46ESect-16.7 P-47ESect-16.7 P-48ESect-16.7 P-49ESect-16.8 P-1ESect-16.8 P-2ESect-16.8 P-3ESect-16.8 P-4ESect-16.8 P-5ESect-16.8 P-6ESect-16.8 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P-6RECh-16 P-7RECh-16 P-8RECh-16 P-9RECh-16 P-10RECh-16 P-11RECh-16 P-12RECh-16 P-13RECh-16 P-14RECh-16 P-15RECh-16 P-16RECh-16 P-17RECh-16 P-18RECh-16 P-19RECh-16 P-20RECh-16 P-21RECh-16 P-22RECh-16 P-23RECh-16 P-24RECh-16 P-25RECh-16 P-27RECh-16 P-28RECh-16 P-29RECh-16 P-30RECh-16 P-31RECh-16 P-32RECh-16 P-33RECh-16 P-34RECh-16 P-35RECh-16 P-36RECh-16 P-37RECh-16 P-38RECh-16 P-39RECh-16 P-40RECh-16 P-41RECh-16 P-1PCh-16 P-2PCh-16 P-3PCh-16 P-5PCh-16 P-6P

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