Question: A thick spherical shell occupies the region between two spheres of radii aand 2a, both centred on the origin. The shell is made of a

A thick spherical shell occupies the region between two spheres of radii aand 2a, both centred on the origin. The shell is made of a material withdensity =Az2x2+y2+z2, where Ais a constant.(a) Show that the density expressed in spherical coordinates (r,,)is=Acos2(b) Hence, or otherwise, find the mass M0sincos2duse the substitution u=cos.

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