A Sphere Is Constructed of Two Concentric Parts

question 49

Essay

A sphere is constructed of two concentric parts.The inner part is a solid sphere of radius
10.0 cm made of a material with density 4000 kg/m³.The outer part is a spherical shell with inner radius 10.0 cm and outer radius 20.0 cm.The material in the outer shell has a density
9000 kg/m³.
(a)What is the mass of the sphere?
(b)What is the average density of this sphere?

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