Q1. (20 marks) A hollow sphere of mass 1.22 kg and density 1300 kg/m3 floats half-submerged in a liquid of density 800 k

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Q1. (20 marks) A hollow sphere of mass 1.22 kg and density 1300
kg/m3 floats half-submerged in a liquid of density 800 kg/m3 .
a) Compute the outer radius of the sphere.
b) Compute the inner radius of the sphere.
c) Compare the density of the sphere’s material and the density
of the liquid and then explain why the sphere floats.