Question

Calculate the buoyant force in air on a kilogram of gold (whose density is about 19 grams per cubic centimeter). The density of air is 1.3 ✕ 10-3 grams per cubic centimeter. Remember that the buoyant force is equal to the weight of a volume of air that is equal to the volume of the object. (Compare with the weight mg of this much gold, which is 9.8 N.)
Density of gold = 19g
Density of air = 0.0013g
Gravity = 9.8
F = m * g
m = Density of air / Density of Gold
Bouyant F = (Density of air / Density of Gold) * 9.8

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