Posted by Elisa on Tuesday, July 22, 2008 at 10:28pm.
The volume of water displaced weighs 80 N, and has a mass of 80 N/g = 8.16 kg. That amount of water occupies 8.16 liters, or 8.16*10^-3 m^3, and equals the volume of the object. So the object's density is
[340 N/g]/8.16*10^-3 m^3
= 4250 kg/m^3
The weight reduction in oil is 5/8 of the weight reduction in water, so the oil has 50/80 of the density of water, or 625kg/m^3
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