e value of alpha(angle) is 40 degre
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section11.3: Hyperbolas
Problem 36E
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Question
the value of alpha(angle) is 40 degree
![A designer proposed using a paraboloid S: x² + y? = z as the basis of a container design.
However, after some discussion, the designer was advised to revert to a matching cone-based
design S, with certain apex angle a, which was said to be able to achieve material cost saving
due to less surface area. Figure 1 gives a visual comparison of the two surfaces.
12 14
radius
0.8
0.6
S2: Cone
04
apex langle a
S1: Paraboloid x + y² = z
02
-12
--0.8
-0.6
-0.4
-0.2
04
0.6
08
12
Figure 1: Visual representations* of the paraboloid surface and its matching cone surface
*Note: the graphs are for illustrative purpose only;
the intersection between S, and S, depends on a and does not always occur at z = 1](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F58f34d33-5848-4b06-a2c0-497413e8254d%2Ff5c76537-861b-403a-b0a9-6b77c15cd2b7%2Fvixq9t_processed.png&w=3840&q=75)
Transcribed Image Text:A designer proposed using a paraboloid S: x² + y? = z as the basis of a container design.
However, after some discussion, the designer was advised to revert to a matching cone-based
design S, with certain apex angle a, which was said to be able to achieve material cost saving
due to less surface area. Figure 1 gives a visual comparison of the two surfaces.
12 14
radius
0.8
0.6
S2: Cone
04
apex langle a
S1: Paraboloid x + y² = z
02
-12
--0.8
-0.6
-0.4
-0.2
04
0.6
08
12
Figure 1: Visual representations* of the paraboloid surface and its matching cone surface
*Note: the graphs are for illustrative purpose only;
the intersection between S, and S, depends on a and does not always occur at z = 1
![With your knowledge in surface integral**, determine the surface area of the cone (S2) and
the surface area of the paraboloid (S,), and find out the surface area saving. Be sure to refer
Table 1 for the value of the apex angle a.
Digit
a (*)
4
40
**Note: it is recommended to use suitable parameterization for ease of evaluating the two surface integrals: e.g.
a possible approach is to view the cone as a circular revolution of a slanted line around the central-axis, so that
for every elevation value z, the x and y are related by the basic circular equation x² + y² = (radius)² (see
Figure 1). This revolution approach is applicable to the paraboloid as well.
END](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F58f34d33-5848-4b06-a2c0-497413e8254d%2Ff5c76537-861b-403a-b0a9-6b77c15cd2b7%2Fjhjah9_processed.png&w=3840&q=75)
Transcribed Image Text:With your knowledge in surface integral**, determine the surface area of the cone (S2) and
the surface area of the paraboloid (S,), and find out the surface area saving. Be sure to refer
Table 1 for the value of the apex angle a.
Digit
a (*)
4
40
**Note: it is recommended to use suitable parameterization for ease of evaluating the two surface integrals: e.g.
a possible approach is to view the cone as a circular revolution of a slanted line around the central-axis, so that
for every elevation value z, the x and y are related by the basic circular equation x² + y² = (radius)² (see
Figure 1). This revolution approach is applicable to the paraboloid as well.
END
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