Question

1. (a) Determine whether or not F is a conservative vector field. If it is, find the potential function for F.

(b) Evaluate R C1 F · dr and R C2 F · dr where C1 is the straight line path from (0, −1) to (3, 0), while C2 is the union of two straight line paths: first piece from (0, −1) to (0, 0) and then second piece from (0, 0) to (3, 0). (When applicable, use the Fundamental Theorem of Line Integrals!!)

F(x, y) = (xy + y 2 )i + (x 2 + 2xy)j.

Answer #1

(a) Is the vector field F = <e^(−x) cos y, e^(−x) sin y>
conservative?
(b) If so, find the associated potential function φ.
(c) Evaluate Integral C F*dr, where C is the straight line path
from (0, 0) to (2π, 2π).
(d) Write the expression for the line integral as a single
integral without using the fundamental theorem of calculus.

Consider the vector force field given by F⃗ = 〈2x + y, 3y +
x〉
(a) Let C1 be the straight line segment from (2, 0) to (−2,
0).
Directly compute ∫ C1 F⃗ · d⃗r (Do not use Green’s Theorem or
the Fundamental Theorem of Line Integration)
(b) Is the vector field F⃗ conservative? If it is not
conservative, explain why. If it is conservative, find its
potential function f(x, y)
Let C2 be the arc of the half-circle...

Determine whether or not F is a conservative
vector field. If it is, find a function f such that
F = ∇f. (If the vector field is not
conservative, enter DNE.)
F(x, y) = (y2 − 8x)i + 2xyj

Determine whether or not F is a conservative
vector field. If it is, find a function f such that
F = ∇f. (If the vector field is not
conservative, enter DNE.)
F(x, y) = (y2 − 8x)i + 2xyj

Determine whether or not the vector field is conservative. If it
is conservative, find a function f such that F = ∇f. (If the vector
field is not conservative, enter DNE.)
F(x, y, z) = 8xyi + (4x2 + 10yz)j + 5y2k
Find: f(x, y, z) =

Let F(x,y,z) = yzi + xzj + (xy+2z)k
show that vector field F is conservative by finding a function f
such that
and use that to evaluate
where C is any path from (1,0,-2) to (4,6,3)

Consider the vector field →F=〈3x+7y,7x+5y〉F→=〈3x+7y,7x+5y〉
Is this vector field Conservative? yes or no
If so:
Find a function ff so that →F=∇fF→=∇f
f(x,y) =_____ + K
Use your answer to evaluate ∫C→F⋅d→r∫CF→⋅dr→ along the curve C:
→r(t)=t2→i+t3→j, 0≤t≤3r→(t)=t2i→+t3j→, 0≤t≤3

For each vector field F~ (x, y) = hP(x, y), Q(x, y)i, find a
function f(x, y) such that F~ (x, y) = ∇f(x, y) = h ∂f ∂x , ∂f ∂y i
by integrating P and Q with respect to the appropriate variables
and combining answers. Then use that potential function to directly
calculate the given line integral (via the Fundamental Theorem of
Line Integrals):
a) F~ 1(x, y) = hx 2 , y2 i Z C F~ 1...

Evaluate
C
F · dr using the Fundamental Theorem of Line Integrals.
F(x, y, z) = 2xyzi + x2zj + x2yk
C: smooth curve from (0, 0, 0) to (1, 7, 2)

Evaluate
C
F · dr using the Fundamental Theorem of Line Integrals.
F(x, y, z) = 2xyzi + x2zj + x2yk
C: smooth curve from (0, 0, 0) to (1, 7, 2)

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