A hollow palladium (ρPd = 1.202 ✕ 104 kg/m3) spherical shell of mass m = 0.9020 kg floats in water with its entire volume below the surface. (Assume the temperature of the water is 4°C. Enter your answers to at least four significant figures.) (a) What is the radius of the sphere?     (b) What is the thickness of the shell wall?

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