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A rock is suspended by a light string. When the rock is in air, the tension in the string is 40.6 N. When the rock is totally immersed in water, the tension is 26.6 N. When the rock is totally immersed in an unknown liquid, the tension is 19.1 N.
What is the density of the unknown liquid?
For a rough calculation, we shall assume that the doctor is 50 from the baby (she is likely to be even closer at delivery), has a mass of 75.00, and can be modelled as a uniform sphere.
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