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13 Dec 2019

A student is given a crucible and asked to determine wheather it is made of pure platinum. The student first weighs the crucible in air and then weighs it suspended in water (density equals 0.9986 g/mL). The readings are 860.2 g and 820.2 g, respectively. Based on these measurements and given that the density of platinum is 21.45 g/cm3 , what should the students conclusion be? (hint: an object suspended in a fluid is buoyed yp the mass of the fluid displaced by the object, neglect the bouyancy of air).

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