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categoryرياضيات
schoolبكالوريوس
event_available2026-07-15
السؤال
Transcribed Image Text:
(1 point) This problem will illustrate the divergence theorem by computing the outward flux of the vector field F(x, y, z) = 3xi + 3yj + 2zk across the
boundary of the right rectangular prism: -2≤ x ≤5,-2≤ y ≤3, -2 ≤ z < 5 oriented outwards using a surface integral and a triple integral over the
solid bounded by rectangular prism.
Note: The vectors in this field point outwards from the origin, so we would expect the flux across each face of the prism to be positive.
Part 1 - Using a Surface Integral
First we parameterize the six faces using 0 < s < 1 and 0 <t≤1:
The face with z = -2: 0₁ = (x₁(s), y₁ (t), z₁ (s, t))
x₁(s) =
y₁ (t) =
Z₁ (s, t) = -2
The face with z=5: 0₂ = (x2(s), y(t), Z2 (s, t))
X2(s) =
y2(t) =
Z2(s, t) = 5
The face with x = -2: 03 = x3(s, t), y3 (S), Z3 (t))
X3(s, t)=-2
y3(s) =
Z3 (t) =
The face with x = 5: 04 = (x4(s, t), y4(s), Z4 (t))
x4(s, t) = 5
y4(s) =
Z4 (t) =
The face with y=-2: 05 = = (xs(s), ys (s, t), Z5 (t))
X5(s) =
ys (s, t)=-2
Z5 (t) =
The face with y=3:06 = (x6(s), y6 (s, t), 26(t))
X6(s) =
y6(s, t) = 3
The face with y = 3: 06 = (x6(s), y6 (s, t), 26(t))
X6(s) =
y6(s, t)=3
Z6 (t) =
Then (mind the orientation)
F.nds =
+ k k
= S'S" "
F(04).
дол
ds
×
дол
004) d
=
Τσι
F(01).
×
dt
ds
301) ds dt +
do₂
F(02).
ds
at
202) ds dt +
d03
F(03).
X
ds dt
Ot
ds
dos
dos
ds dt +
F(05).
×
ds
³) ds dt + '"
доб
F(06).
X
at
ds
006) ds dt
Part 2 - Using the Divergence Theorem
F.ndS=
[[ F-n
=/
div F dV =
s = √ √ √ √ di
dx dydz
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