Birth Rate of Unmarried Women In the United States, the birth rate B of unmarried women (births per 1000 unmarried women) for women whose age is a is modelled by the function B ( a ) = − 0.33 a 2 + 19.17 a − 213.37 . What is the age of unmarried women with the highest birth rate? What is the highest birth rate of unmarried women? Evaluate and interpret B ( 40 ) .
Birth Rate of Unmarried Women In the United States, the birth rate B of unmarried women (births per 1000 unmarried women) for women whose age is a is modelled by the function B ( a ) = − 0.33 a 2 + 19.17 a − 213.37 . What is the age of unmarried women with the highest birth rate? What is the highest birth rate of unmarried women? Evaluate and interpret B ( 40 ) .
Birth Rate of Unmarried Women In the United States, the birth rate
B
of unmarried women (births per
1000
unmarried women) for women whose age is
a
is modelled by the function
B
(
a
)
=
−
0.33
a
2
+
19.17
a
−
213.37
.
What is the age of unmarried women with the highest birth rate?
What is the highest birth rate of unmarried women?
2. Suppose that U(x, y, z) = x² + y²+ z² represents the temperature of a 3-dimensional solid object
at any point (x, y, z). Then
F(x, y, z) = -KVU (x, y, z)
represents the heat flow at (x, y, z) where K > 0 is called the conductivity constant and the
negative sign indicates that the heat moves from higher temperature region into lower temperature
region. Answer the following questions.
(A) [90%] Compute the inward heat flux (i.e., the inward flux of F) across the surface z =
1 - x² - y².
(B) [10%] Use the differential operator(s) to determine if the heat flow is rotational or irrotational.
Could you show why the answer is B
Using polar coordinates and the area formula
1. The parametric equations
x = u, y = u cos v, z = usin v, with Ou≤ 2,
0 ≤ v ≤ 2π
represent the cone that is obtained by revolving (about x-axis) the line y = x (for 0 ≤ x ≤2) in
the xy-plane. Answer the following questions.
(A) [50%] Sketch the cone and compute its surface area, which is given by
dS =
[ |
Ər Or
ди მა
×
du dv
with S being the cone surface and D being the projection of S on the uv-plane.
(B) [50%] Suppose that the density of the thin cone is σ(x, y, z) = 0.25x gr/cm². Compute the
total mass of the cone.
Calculus for Business, Economics, Life Sciences, and Social Sciences (14th Edition)
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