1) Given F(x, y, z) = x³ i + 3yj - z4 k and the curve C parametrized by r(t) = (sint, cost,t), te [0, π] evaluate F.idx and F. k dz a) b) F.T ds c) Consider the closed curve C' obtained by the union of C and the segment that joins the points (0,-1, π) and (0,1,0). Evaluate the integral of F along C' and verify that it is equal to zero.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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### Worksheet 18: Group Work

#### Problem 1:
Given \( \mathbf{F}(x, y, z) = x^3 \mathbf{i} + 3y \mathbf{j} - z^4 \mathbf{k} \) and the curve \( C \) parameterized by \( \mathbf{r}(t) = (\sin t , \cos t , t) \), \( t \in [0, \pi] \), evaluate the following:

a) \( \int_C \mathbf{F} \cdot \mathbf{i} \, dx \) and \( \int_C \mathbf{F} \cdot \mathbf{k} \, dz \)

b) \( \int_C \mathbf{F} \cdot T \, ds \)

c) Consider the closed curve \( C' \) obtained by the union of \( C \) and the segment that joins the points \((0,-1, \pi)\) and \((0,1,0)\). Evaluate the integral of \( \mathbf{F} \) along \( C' \) and verify that it is equal to zero.

#### Problem 2:

a) Show that any vector field in the form of \( \mathbf{F}(x, y, z) = f(x) \mathbf{i} + g(y) \mathbf{j} + h(z) \mathbf{k} \), where \( f \), \( g \), and \( h \) are continuous functions that depend only on one variable, is a gradient field.

b) Evaluate the integral of the vector field \( \mathbf{F}(x, y, z) = \sin x \, \mathbf{i} + \ln(y^2 + 1) \, \mathbf{j} \) over the “crazy curve” parameterized by 
\[
\mathbf{r}(t) = \left( t(t - 1) e^{t^3 + 4 \sin t} / (1 + \cos^2 (4t - 7)) \right) \mathbf{i} + \left( t(t^2 - 1) (\tan t^3 + 4 \sin t) / (1 + e^{4t - 7}) \right) \mathbf{j}, \, t \in [0, 1]
\]
Transcribed Image Text:### Worksheet 18: Group Work #### Problem 1: Given \( \mathbf{F}(x, y, z) = x^3 \mathbf{i} + 3y \mathbf{j} - z^4 \mathbf{k} \) and the curve \( C \) parameterized by \( \mathbf{r}(t) = (\sin t , \cos t , t) \), \( t \in [0, \pi] \), evaluate the following: a) \( \int_C \mathbf{F} \cdot \mathbf{i} \, dx \) and \( \int_C \mathbf{F} \cdot \mathbf{k} \, dz \) b) \( \int_C \mathbf{F} \cdot T \, ds \) c) Consider the closed curve \( C' \) obtained by the union of \( C \) and the segment that joins the points \((0,-1, \pi)\) and \((0,1,0)\). Evaluate the integral of \( \mathbf{F} \) along \( C' \) and verify that it is equal to zero. #### Problem 2: a) Show that any vector field in the form of \( \mathbf{F}(x, y, z) = f(x) \mathbf{i} + g(y) \mathbf{j} + h(z) \mathbf{k} \), where \( f \), \( g \), and \( h \) are continuous functions that depend only on one variable, is a gradient field. b) Evaluate the integral of the vector field \( \mathbf{F}(x, y, z) = \sin x \, \mathbf{i} + \ln(y^2 + 1) \, \mathbf{j} \) over the “crazy curve” parameterized by \[ \mathbf{r}(t) = \left( t(t - 1) e^{t^3 + 4 \sin t} / (1 + \cos^2 (4t - 7)) \right) \mathbf{i} + \left( t(t^2 - 1) (\tan t^3 + 4 \sin t) / (1 + e^{4t - 7}) \right) \mathbf{j}, \, t \in [0, 1] \]
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