Evaluating a Line Integral of a Vector Field In Exercises 47 and 48, evaluate ∫ C F · d r for each curve. Discuss the orientation of the curve and its effect on the value of the integral. F ( x , y ) = x 2 i + x y j (a) C 1 : r 1 ( t ) = 2 t i + ( t − 1 ) j, 1 ≤ t ≤ 3 (b) C 2 : r 2 ( t ) = 2 ( 3 − t ) i + ( 2 − t ) j , 0 ≤ t ≤ 2
Evaluating a Line Integral of a Vector Field In Exercises 47 and 48, evaluate ∫ C F · d r for each curve. Discuss the orientation of the curve and its effect on the value of the integral. F ( x , y ) = x 2 i + x y j (a) C 1 : r 1 ( t ) = 2 t i + ( t − 1 ) j, 1 ≤ t ≤ 3 (b) C 2 : r 2 ( t ) = 2 ( 3 − t ) i + ( 2 − t ) j , 0 ≤ t ≤ 2
Solution Summary: The author explains that both path joins the two points (2,0 to 6,2), but their integrals are negative of each other because they are different.
Evaluating a Line Integral of a Vector Field In Exercises 47 and 48, evaluate
∫
C
F
·
d
r
for each curve. Discuss the orientation of the curve and its effect on the value of the integral.
F
(
x
,
y
)
=
x
2
i
+
x
y
j
(a)
C
1
:
r
1
(
t
)
=
2
t
i
+
(
t
−
1
)
j,
1
≤
t
≤
3
(b)
C
2
:
r
2
(
t
)
=
2
(
3
−
t
)
i
+
(
2
−
t
)
j
,
0
≤
t
≤
2
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.
Determine whether the lines
L₁ (t) = (-2,3, −1)t + (0,2,-3) and
L2 p(s) = (2, −3, 1)s + (-10, 17, -8)
intersect. If they do, find the point of intersection.
Convert the line given by the parametric equations y(t)
Enter the symmetric equations in alphabetic order.
(x(t)
= -4+6t
= 3-t
(z(t)
=
5-7t
to symmetric equations.
Find the point at which the line (t) = (4, -5,-4)+t(-2, -1,5) intersects the xy plane.
Chapter 15 Solutions
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