A block of birch wood floats in oil with 90.0% of its volume submerged. What is the density of the oil? The density of the birch is 0.67 g/cm ^3
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A body displaces a volume of liquid. The weight of the displaced liquid pushes up on the body. If that weight equals the weight of the body, the body floats. If not, the body sinks.
So you are given that 90% of a cc of liquid weighs .67 gram. (We'll just assume the body is exactly 1 cc.) So you calculate grams/cc = .67 g/.9 cc = .74444 g/cc.
So you are given that 90% of a cc of liquid weighs .67 gram. (We'll just assume the body is exactly 1 cc.) So you calculate grams/cc = .67 g/.9 cc = .74444 g/cc.
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Here is the answer:
.67/.9 = .7444 cm/gr
.67/.9 = .7444 cm/gr