A cube of wood whose edge is 12 mm is floating in a liquid in a glass with one of its faces parallel to the liquid surface. The density of wood is 936 kg/m3, that of liquid is 1296 kg/m3.
A light oil is gently poured onto the immiscible liquid surface to form a 2.4 mm thick
layer above the liquid. The density of the oilis 606 kg/m3.
Additional light oil is poured onto the liquid surface until the top surface of the oil coincides with the top surface of the wood cube (in hydrostatic equilibrium). How thick is the whole layer of the light oil? Answer in units of mm.
