Question: rock is suspended by a light string. When the rock is in air, the ten - sion in the string is 4 0 N .

rock is suspended by a light string. When the rock is in air, the ten-
sion in the string is 40 N. When the rock is totally immersed in water,
the tension is 20 N. When the rock is totally immersed in an unknown
liquid, the tension is 14 N. What is the density of the unknown liquid?
Ignore the buoyant force exerted on the rock when it is in air.

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