Flux Consider the vector fields and curves in Exercises 57–58. a. Based on the picture, make a conjecture about whether the outward flux of F across C is positive, negative, or zero. b. Compute the flux for the vector fields and curves. 59. F and C given in Exercise 57 57. F = 〈 y − x , x 〉 ; C : r ( t ) = 〈 2 cos t , 2 sin t 〉 , for 0 ≤ t ≤ 2 π
Flux Consider the vector fields and curves in Exercises 57–58. a. Based on the picture, make a conjecture about whether the outward flux of F across C is positive, negative, or zero. b. Compute the flux for the vector fields and curves. 59. F and C given in Exercise 57 57. F = 〈 y − x , x 〉 ; C : r ( t ) = 〈 2 cos t , 2 sin t 〉 , for 0 ≤ t ≤ 2 π
Solution Summary: The flow of F on C is negative. The vector field F is directed inwards, but the flow is opposite to the orientation of the curve.
Flux Consider the vector fields and curves in Exercises 57–58.
a. Based on the picture, make a conjecture about whether the outward flux of F across C is positive, negative, or zero.
b. Compute the flux for the vector fields and curves.
59. F and C given in Exercise 57
57.
F
=
〈
y
−
x
,
x
〉
;
C :
r
(
t
)
=
〈
2
cos
t
,
2
sin
t
〉
,
for 0 ≤ t ≤ 2π
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.
(5)
Let ß be the vector-valued function
3u
ß: (-2,2) × (0, 2π) → R³, B(U₁₂ v) = {
3u²
4
B (0,7), 0₁B (0,7), 0₂B (0,7)
u cos(v)
VI+ u², sin(v),
(a) Sketch the image of ß (i.e. plot all values ß(u, v), for (u, v) in the domain of ß).
(b) On the sketch in part (a), indicate (i) the path obtained by holding v = π/2 and
varying u, and (ii) the path obtained by holding u = O and varying v.
(c) Compute the following quantities:
(d) Draw the following tangent vectors on your sketch in part (a):
X₁ = 0₁B (0₂7) B(0)¹ X₂ = 0₂ß (0,7) p(0.4)*
'
cos(v)
√1+u²
+
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