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Density and Rock

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A geologist finds that a moon rock whose mass is 8.80 kg has an apparent mass of 6.7 kg when submerged in water. What is the density of the rock?

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Solution Summary

This solution uses the Archimedes Principle to determine the density of the moon rock using the absolute and apparent mass when submerged in water.

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Archimedes Principle (slightly paraphrased):

"When an object is immersed in a fluid it is buoyed up by a force equal to the weight of the fluid displaced by the object."

A fluid or gas is constantly exerting pressure on any object that is submerged inside of that fluid / gas. This "pressure" tries to force the object upwards due to the displaced volume of fluid that occurs from the ...

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