What’s wrong? Consider the rotation field F = ( − y , x ) x 2 + y 2 . a. Verify that the two-dimensional curl of F is zero, which suggests that the double integral in the circulation form of Green’s Theorem is zero. b. Use a line integral to verify that the circulation on the unit circle of the vector field is 2 π . c. Explain why the results of parts (a) and (b) do not agree.
What’s wrong? Consider the rotation field F = ( − y , x ) x 2 + y 2 . a. Verify that the two-dimensional curl of F is zero, which suggests that the double integral in the circulation form of Green’s Theorem is zero. b. Use a line integral to verify that the circulation on the unit circle of the vector field is 2 π . c. Explain why the results of parts (a) and (b) do not agree.
Solution Summary: The author explains that the two dimensional curl of the vector field is zero.
What’s wrong? Consider the rotation field
F
=
(
−
y
,
x
)
x
2
+
y
2
.
a. Verify that the two-dimensional curl of F is zero, which suggests that the double integral in the circulation form of Green’s Theorem is zero.
b. Use a line integral to verify that the circulation on the unit circle of the vector field is 2π.
c. Explain why the results of parts (a) and (b) do not agree.
Quantities that have magnitude and direction but not position. Some examples of vectors are velocity, displacement, acceleration, and force. They are sometimes called Euclidean or spatial vectors.
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13: If the perimeter of a square is shrinking at a rate of 8 inches per second, find the rate at which its area is changing when its area is 25 square inches.
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11: A rectangle has a base that is growing at a rate of 3 inches per second and a height that is shrinking at a rate of one inch per second. When the base is 12 inches and the height is 5 inches, at what rate is the area of the rectangle changing?
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The sides of a cube of ice are melting at a rate of 1 inch per hour. When its volume is 64 cubic inches, at what rate is its volume changing?
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