4. Consider the vector field F(r, y, z) = (x, y, z). (a) Sketch a picture of F. (b) Calculate div F. How can we visualize div F in terms of the vector field? (c) Suppose that F represents a fluid flow in 3-d space. Imagine a small sphere or cube placed at the point (3, 0, 4). Is more fluid flowing into the object or out of it?
4. Consider the vector field F(r, y, z) = (x, y, z). (a) Sketch a picture of F. (b) Calculate div F. How can we visualize div F in terms of the vector field? (c) Suppose that F represents a fluid flow in 3-d space. Imagine a small sphere or cube placed at the point (3, 0, 4). Is more fluid flowing into the object or out of it?
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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![**Problem 4: Vector Field Analysis**
Consider the vector field \(\mathbf{F}(x, y, z) = \langle x, y, z \rangle\).
**(a) Sketch a picture of \(\mathbf{F}\).**
(Sketch Description: In this section, you need to create a vector field diagram for \(\mathbf{F}(x, y, z) = \langle x, y, z \rangle\). This means that at any point \((x, y, z)\) in space, the vector \(\mathbf{F}\) points directly away from the origin and has a magnitude equal to the distance from the origin. The length of the vectors increases as you move further from the origin.)
**(b) Calculate \(\text{div} \mathbf{F}\). How can we visualize \(\text{div} \mathbf{F}\) in terms of the vector field?**
To calculate the divergence of \(\mathbf{F}\), use the formula for the divergence of a vector field:
\[
\text{div} \mathbf{F} = \frac{\partial F_1}{\partial x} + \frac{\partial F_2}{\partial y} + \frac{\partial F_3}{\partial z}
\]
Given \(\mathbf{F}(x, y, z) = \langle x, y, z \rangle\), the components are \(F_1 = x\), \(F_2 = y\), and \(F_3 = z\). Taking the partial derivatives:
\[
\frac{\partial F_1}{\partial x} = 1, \quad \frac{\partial F_2}{\partial y} = 1, \quad \frac{\partial F_3}{\partial z} = 1
\]
Thus,
\[
\text{div} \mathbf{F} = 1 + 1 + 1 = 3
\]
The divergence of \(\mathbf{F}\) is a constant value of 3. This means that, at any point in space, the vector field \(\mathbf{F}\) represents a uniform source, indicating that fluid is flowing outward from each point in space with a constant rate.
**(c) Suppose that \(\mathbf{F}\) represents a fluid flow in 3-D](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F191441f0-66db-457d-b504-dd20fe1485fa%2F54926a54-2576-46f5-b036-4d53f775d44e%2Fxqiwqhb_processed.png&w=3840&q=75)
Transcribed Image Text:**Problem 4: Vector Field Analysis**
Consider the vector field \(\mathbf{F}(x, y, z) = \langle x, y, z \rangle\).
**(a) Sketch a picture of \(\mathbf{F}\).**
(Sketch Description: In this section, you need to create a vector field diagram for \(\mathbf{F}(x, y, z) = \langle x, y, z \rangle\). This means that at any point \((x, y, z)\) in space, the vector \(\mathbf{F}\) points directly away from the origin and has a magnitude equal to the distance from the origin. The length of the vectors increases as you move further from the origin.)
**(b) Calculate \(\text{div} \mathbf{F}\). How can we visualize \(\text{div} \mathbf{F}\) in terms of the vector field?**
To calculate the divergence of \(\mathbf{F}\), use the formula for the divergence of a vector field:
\[
\text{div} \mathbf{F} = \frac{\partial F_1}{\partial x} + \frac{\partial F_2}{\partial y} + \frac{\partial F_3}{\partial z}
\]
Given \(\mathbf{F}(x, y, z) = \langle x, y, z \rangle\), the components are \(F_1 = x\), \(F_2 = y\), and \(F_3 = z\). Taking the partial derivatives:
\[
\frac{\partial F_1}{\partial x} = 1, \quad \frac{\partial F_2}{\partial y} = 1, \quad \frac{\partial F_3}{\partial z} = 1
\]
Thus,
\[
\text{div} \mathbf{F} = 1 + 1 + 1 = 3
\]
The divergence of \(\mathbf{F}\) is a constant value of 3. This means that, at any point in space, the vector field \(\mathbf{F}\) represents a uniform source, indicating that fluid is flowing outward from each point in space with a constant rate.
**(c) Suppose that \(\mathbf{F}\) represents a fluid flow in 3-D
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