Chapter 8: Applications of Triple Integration
Section 8.1: Volume
Example 8.1.6
Use an iterated triple integral to obtain the volume of R, the first-octant region bounded above by the cylinder z=3−x2, and on the right by the paraboloid 3 y=x2+z2.
Solution
Mathematical Solution
Figure 8.1.6(a) shows the solid whose volume is obtained by iterating a triple integral in Cartesian coordinates in the order dy dz dx.
∫03∫03−x2∫0x2+z2/31 dy dz dx = 6235⁢3
Figure 8.1.6(a) The solid
Maple Solution - Interactive
Initialize
Tools≻Load Package: Student Multivariate Calculus
Loading Student:-MultivariateCalculus
Access the MultiInt command via the Context Panel
Type the integrand, 1.
Context Panel: Student Multivariate Calculus≻Integrate≻Iterated Fill in the fields of the two dialogs shown below.
Context Panel: Evaluate Integral
1→MultiInt∫03∫0−x2+3∫013⁢x2+13⁢z21ⅆyⅆzⅆx=6235⁢3
Table 8.1.6(a) provides a solution by a task template that integrates in Cartesian coordinates and draws the region of integration.
Tools≻Tasks≻Browse: Calculus - Multivariate≻Integration≻Visualizing Regions of Integration≻Cartesian 3-D
Evaluate ∭RΨx,y,z dv and Graph R
Volume Element dv
Select dvdz dy dxdz dx dydx dy dzdx dz dydy dx dzdy dz dx
, where Ψ=
F=
G=
b=
f=
g=
a=
Table 8.1.6(a) Task template integrating in Cartesian coordinates
Table 8.1.4(b) provides a solution from first principles.
Calculus Palette: Iterated triple-integral template
Context Panel: Evaluate and Display Inline
∫03∫03−x2∫0x2+z2/31 ⅆy ⅆz ⅆx = 6235⁢3
Table 8.1.6(b) Integration via first principles
Maple Solution - Coded
Table 8.1.6(c) obtains a solution via the MultiInt command in the Student MultivariateCalculus package.
Student:-MultivariateCalculus:-MultiInt1,y=0..x2+z2/3,z=0..3−x2,x=0..3 = 6235⁢3
Table 8.1.6(c) MultiInt command iterating in Cartesian coordinates in the order dy dz dx
Table 8.1.6(d) implements the iterated integration via the top-level Int and int commands.
Int1,y=0..x2+z2/3,z=0..3−x2,x=0..3=int1,y=0..x2+z2/3,z=0..3−x2,x=0..3
∫03∫0−x2+3∫013⁢x2+13⁢z21ⅆyⅆzⅆx=6235⁢3
Table 8.1.6(d) Top-level Int and int commands
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