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A geologist finds that a moon rock whose mass is 8.08 kg has an apparent mass of 5.12 kg when submerged in water. What is the density of the rock?
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Added Thu, 02 Jul '15
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Loss in weight = weight of water displaced
8.08 - 5.12 = 2.96 kg = 2960g
If water has a density of 1g/cm^3 (1000kg/m^3)
the volume of the rock = 2960 cm^3
density of rock = mass/volume = 8080/2960 = 2.729 g/cm^3

=(2729kg/m^3)
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Added Thu, 02 Jul '15
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