Question

A rock is suspended by a light string and in air the tension is 39.2 N....

A rock is suspended by a light string and in air the tension is 39.2 N. When immersed by half its volume in water, the tension is 28.4 N. When immersed fully in a liquid of unknown density, the tension is 21.5 N. What is the density of the unknown fluid?

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