Chapter 6: Applications of Double Integration
Section 6.6: Second Moments
Example 6.6.6
Find the moments of inertial and , the total mass , and the radii of gyration and of the lamina that
has the shape of the cardioid , and that has density .
See Example 6.5.6.
Solution
Mathematical Solution
The relevant calculations (done in polar coordinates) are in Table 6.6.6(a).
=
≐ 1.2
≐ 0.73
Table 6.6.6(a) Moments of inertia and radii of gyration
Maple Solution - Interactive
A solution from first principles is detailed in Table 6.6.6(b).
Define the density in polar coordinates
Context Panel: Assign Name
Obtain , the total mass in region
Calculus palette: Iterated double-integral template
Context Panel: Evaluate and Display Inline
Context Panel: Assign to a Name≻
Obtain , the moment of inertia about the -axis
Obtain
Context Panel: Approximate≻10 (digits)
Table 6.6.6(b) Calculation of moments of inertia and radii of gyration from first principles
Maple Solution - Coded
Total mass
Use the Int and value commands.
Second Moments (Moments of Inertia)
Radii of gyration
Use the sqrt and evalf commands.
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