A rock is suspended by a light string. When the rock is in air, the tension in the string is 40.0 N. When the rock is totally immersed in water, the tension is 29.0 N. When the rock is totally immersed in an unknown liquid, then the tension is 22.0 N. (a) What is the volume of the rock? (b) What is the density of the unknown liquid? (density of water is 1.00*10^3 kg/m^3

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