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physics

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To verify her suspicion that a rock specimen is hollow, a geologist weighs the specimen in air and in water.She finds that the specimen weighs twice as much in air as it does in water.The solid part of the specimen has a density of 5.0 multiplied by 10(cubed)kg/m(cubed).What fraction of the specimen's apparent volume is solid

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    The average density of the rock is 2.00*10^3 kg/m^3, which is twice that of water. That is because the buoyancy force in water equals half the weight in air. The solid part (with mass 5.0 kg/m^3) needs to occupy only 40% of the volume in order for the rock to have a total mass of 2.00*10^3 kg/m^3.

    40% is the answer

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