Question

A spherical shell centered at the origin has an inner radius of 4 cm and an outer radius of 6 cm.


A spherical shell centered at the origin has an inner radius of 4 cm and an outer radius of 6 cm. The density, δ, of the material increases linearly with the distance from the center. At the inner surface, δ = 9 g/cm3; at the outer surface, g = 13 g/cm3 

(a) Using spherical coordinates, write the density, δ, as a function of radius, p. (Type rho for ρ) 

(b) Write an integral in spherical coordinates giving the mass of the shell (for this representation, do not reduce the domain of the integral by using symmetry; type phi and theta for φ and θ) 

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(c) Find the mass of the shell. 

Mass = _______  Include units.

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