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A hollow sphere of inner radius 8.71 cm and outer radius 9.79 cm floats half-submerged in...

A hollow sphere of inner radius 8.71 cm and outer radius 9.79 cm floats half-submerged in a liquid of density 898.00 kg/m3. (a) What is the mass of the sphere? (b) Calculate the density of the material of which the sphere is made.

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