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An object weighing 344 N in air is immersed in water after being tied to a...

An object weighing 344 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 260 N. Immersed in oil, the object appears to weigh 283 N. (a) Find the density of the object. kg/m3 (b) Find the density of the oil. kg/m3

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Answer #1

(a)

ρobject = ρw/[1 - Wwater / Wair]

                         = (1000 kg/m3)/[1 - 260 N / 344 N]

                         = 4.08*103 kg/m3

(b)

ρoil = ρobject[1 - Woil / Wair]

                         = (4.08*103 kg/m3)[1 - 283 N / 344 N]

                         = 7.23*102 kg/m3

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