Total Mass of a Region in the Plane
(Page: 1
 2 ) Text The mass of an object is calculated by integrating its density function over the region of the domain that it occupies.
For a density function ρ(r,θ) of two variables and an object in the domain of ρ occupying a region R, the mass is
∫∫_{R}ρ(r,θ) rdrdθ.
Demos
Density Functions and Mass
 
This demo resembles that on page 1 except that the domain is given in polar coordinates.

