D. Find the volume of the solid that results when the region enclosed by y = Vĩ, y = 0, and x = 9 is revolved about the line x = 9. Find the yolume of the solid that results when the region in

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter9: Surfaces And Solids
Section9.CR: Review Exercises
Problem 22CR
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Determine  whether the statement is true or false. Assume that a solid S of  volume V is bounded by two parallel  planes  perpendicular to the x-axis at x=a and x=b and that for each x in [a,b], A(x) denotes the cross-sectional  area of S perpendicular to the x-axis. (Solve question #39)

37. Consider the solid gene
region in Exercise 1 about the line y = 2.
(a) Make a conjecture as to which is larger: the volume
of this solid or the volume of the solid in Exercise 1,
Explain the basis of your conjecture.
(b) Check your conjecture by calculating this volume
and comparing it to the yolume obtained in Exer-
cise 1.
38. Consider the solid generated by revolving the shaded
50. As shown in the accompanying figure, a
designed with three semicircular support
each horizontal cross section is a regul
that the volume of the dome is r'V3.
region in Exercise 4 about the line x= 2.5.
(a) Make a conjecture as to which is larger: the volume
of this solid or the volume of the solid in Exercise 4.
Explain the basis of your conjecture.
(b) Check your conjecture by calculating this volume
and comparing it to the volume obtained in Exer-
cise 4.
Figure Ex-
39. Find the volume of the solid that results when the region
enclosed by v = V, v = 0, and x = 9 is revolved about
the line x = 9.
C 51-54 Use a CAS to estimate the volum
sults when the region enclosed by the cur
the stated axis.
40. Find the volume of the solid that results when the region in
Exercise 39 is revolved about the line y = 3.
41. Find the volume of the solid that results when the region
51. y = sin° x, y = 2x/T, x = 0, x = T
52. y = 7' sin x cos' x, y = 4x, x =
53. y = e*, x = 1, y = 1; y-axis
54. y = xVtan-x, y = x; x-axis
enclosed by x = y? and x = y is revolved about the line
55. The accompanying figure shows a
p and heighth cut from a sphere of
volume V of the spherical cap can
(a) V = ah?(3r – h)
y = -1.
42. Find the volume of the solid that results when the region in
Exercise 41 is revolved about the line x = -1.
(b)
43. Find the volume of the solid that results when the region
enclosed by y = x' and y = x' is revolved about the line
x= 1.
44. Find the volume of the solid that results when the region in
Exercise 43 is revolved about the line y = -1
45. A nose cone for a space reentry vehičle is designed so that
a cross section, taken x ft from the tip and perpendicular to
the axis of symmetry, is a circle of radius x ft. Find the
volume of the nose cone given that its length is 20 ft.
Figure Ex-5
46. A certain solid is 1 ft high, and a horizontal cross section
taken x ft above the bottom of the solid is an annulus of
inner radius x² ft and outer radius Vx ft. Find the volume
56. If fluid enters a hemispherical be
a rate of ; ft'/min, how fast w
the depth is 5 ft? [Hìnt: See Ex
57. The accompanying figure show
lightbulb at 10 equally spaced
(a) Use formulas from geome
of the volume enclosed by
(b) Use the average of left an
tions to approximate the
of the solid.
47. Find the volume of the solid whose base is the region
bounded between the curves y = x and y = x', and whose
cross sections perpendicular to the x-axis are squares.
48. The base of a certain solid is the region enclosed by y =
Vĩ, y = 0, and r = 4. Every cross section perpendicular to
the x-axis is a semicircle with its diameter across the base.
Find the volume of the solid.
49. In parts (a)-(c) find the volume of the solid whose base is
enclosed by the circle x2 + y? = 1 and whose cross sec-
tions taken perpendicular to the x-axis are
(a) semicircles
(c) equilateral triangles.
2 N N N - -
C-8-お_8_あ_あ_8.
(b) squares
5.
5 cm
A Figure Ex-57
Transcribed Image Text:37. Consider the solid gene region in Exercise 1 about the line y = 2. (a) Make a conjecture as to which is larger: the volume of this solid or the volume of the solid in Exercise 1, Explain the basis of your conjecture. (b) Check your conjecture by calculating this volume and comparing it to the yolume obtained in Exer- cise 1. 38. Consider the solid generated by revolving the shaded 50. As shown in the accompanying figure, a designed with three semicircular support each horizontal cross section is a regul that the volume of the dome is r'V3. region in Exercise 4 about the line x= 2.5. (a) Make a conjecture as to which is larger: the volume of this solid or the volume of the solid in Exercise 4. Explain the basis of your conjecture. (b) Check your conjecture by calculating this volume and comparing it to the volume obtained in Exer- cise 4. Figure Ex- 39. Find the volume of the solid that results when the region enclosed by v = V, v = 0, and x = 9 is revolved about the line x = 9. C 51-54 Use a CAS to estimate the volum sults when the region enclosed by the cur the stated axis. 40. Find the volume of the solid that results when the region in Exercise 39 is revolved about the line y = 3. 41. Find the volume of the solid that results when the region 51. y = sin° x, y = 2x/T, x = 0, x = T 52. y = 7' sin x cos' x, y = 4x, x = 53. y = e*, x = 1, y = 1; y-axis 54. y = xVtan-x, y = x; x-axis enclosed by x = y? and x = y is revolved about the line 55. The accompanying figure shows a p and heighth cut from a sphere of volume V of the spherical cap can (a) V = ah?(3r – h) y = -1. 42. Find the volume of the solid that results when the region in Exercise 41 is revolved about the line x = -1. (b) 43. Find the volume of the solid that results when the region enclosed by y = x' and y = x' is revolved about the line x= 1. 44. Find the volume of the solid that results when the region in Exercise 43 is revolved about the line y = -1 45. A nose cone for a space reentry vehičle is designed so that a cross section, taken x ft from the tip and perpendicular to the axis of symmetry, is a circle of radius x ft. Find the volume of the nose cone given that its length is 20 ft. Figure Ex-5 46. A certain solid is 1 ft high, and a horizontal cross section taken x ft above the bottom of the solid is an annulus of inner radius x² ft and outer radius Vx ft. Find the volume 56. If fluid enters a hemispherical be a rate of ; ft'/min, how fast w the depth is 5 ft? [Hìnt: See Ex 57. The accompanying figure show lightbulb at 10 equally spaced (a) Use formulas from geome of the volume enclosed by (b) Use the average of left an tions to approximate the of the solid. 47. Find the volume of the solid whose base is the region bounded between the curves y = x and y = x', and whose cross sections perpendicular to the x-axis are squares. 48. The base of a certain solid is the region enclosed by y = Vĩ, y = 0, and r = 4. Every cross section perpendicular to the x-axis is a semicircle with its diameter across the base. Find the volume of the solid. 49. In parts (a)-(c) find the volume of the solid whose base is enclosed by the circle x2 + y? = 1 and whose cross sec- tions taken perpendicular to the x-axis are (a) semicircles (c) equilateral triangles. 2 N N N - - C-8-お_8_あ_あ_8. (b) squares 5. 5 cm A Figure Ex-57
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