A block floats at the interface of two immiscible liquids, with p1 and p2 as the densities of the upper liquid and the lower liquid, respectively. The block has a volume of Vy and a density of Pb. Derive an expression for the volume of the upper liquid displaced by the block, V1, as a function of the densities (P1, P2, and pb) and the block volume, Vh. Hint: The buoyant force is equal to the weight of the block