In seawater a life preserver with a volume of 400times102m3, Ask an Expert

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In seawater, a life preserver with a volume of 4.00×10?2m^3 will support a 72.0kg person (average density 980kg/m^3 ), with 20.0% of the person's volume above water when the life preserver is fully submerged. What is the density of the material composing the life preserver?

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