本次加拿大代写是一个数学的练习题

[3] 1. Let C be the curve given by the intersection of the cylinder x2 + z2 = 9 and the plane z = 2x ! y.
Assume counter-clockwise orientation when seen from the positive y-axis.

(a) Find a parameterization of C.

(b) Describe, in words, what it means for C to be a field line of a vector field F .

[6] 2. Let F (x, y) = (x2y2, y4) and let C be the positively-oriented rectangle with vertices (0, 0), (2, 0),
(2, 1), and (0, 1).

(a) Find RC F · dx by setting up and evaluating the appropriate definite integral(s).

(b) Find RC F · dx using Green’s Theorem. Confirm that you get the same result as in (a).

3. Let

and let C be the positively-oriented diamond with vertices (1, 0), (0, 1), (!1, 0), and (0, !2). Find
RCF · dx. Hint: choose your technique wisely.

4. Let ⌃ be the part of the cone z = px2 + y2 inside the cylinder x2 + y2 = 9. Assume the normal
points inward (towards the z-axis).

(a) Find a parameterization of ⌃.

(b) Let F (x, y, z) = (x, y, 0). Find the surface integral of F on ⌃.

5. Consider the vector field F (x, y, z) = (x2 + y2, 0, z).

(a) Find the divergence r · F .
(b) Write F in cylindrical coordinates.
(c) Now, find r · F in cylindrical coordinates.
(d) Confirm that your results in (a) and (c) are the same.

6. Use Cartesian Tensor notation to prove that a ⇥ (b ⇥ c) = (a · c)b ! (a · b)c, where a, b, and c are
vectors.


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