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MATHS 2101/7101 Multivariable and Complex Calculus (Semester 1, 2023) Assignment 3
发布时间:2023-05-28
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Multivariable and Complex Calculus (MCC)
MATHS 2101/7101 (Semester 1, 2023)
Assignment 3
10 marks total |
1. A certain curvilinear system has coordinates (u,v,) which are related to rectangular coordinates by
(x,y,z) = (uv cos ,uv sin
, 1
2 (u2 — v2 )) ,
with the restrictions u 0, v
0 and 0 ≤
< 2
. 2
(a) Find the unit vectors and scale factors of this curvilinear coordinate system. Is (u,v,) an orthogonal coordinate system?
(b) What is the expression for ∇ · f , for a general vector ield f = fu(u,v,)eu + fv(u,v,
)ev + f
(u,v,
)e
? Determine the divergence of the particular function f (u,v,
) =
(eu + ev) + uv
e
.
2. Draw a clear diagram displaying the region of integration for
I = \0 1 xy dy dx,
and thereby determine the form of I with the order of integration reversed . Conirm that both orders of
integration give the same result . 3
3. The vertices of a tetrahedron T in R3 are at (0, 1, 1), (1, 0, 0), (0, 1, 0) and the origin . Carefully sketch T ,
\\\
4. The general position along a wire can be expressed as
r(
) = acos
i + asin
j + k ,
∈ [0, 2
) .
parametrically. This wire comprises one loop of a helix or radius a, and extends a height h above the
xy-plane. 3
(a) What is the length of the wire, in terms of the positive parameters a and h? Interpret your expression for h = 0.
(b) Prove that the average value of the z-coordinate along the arclength of the wire is h/2.