A sealed tank contains a layer of oil floating on top of water

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Fluids · Fluids

Problem

A sealed tank contains a 0.30 m0.30\,\text{m} layer of oil floating on top of water. The oil has density 800 kg/m3800\,\text{kg/m}^3, and the density of the water is 1000 kg/m31000\,\text{kg/m}^3. Which expression gives the gauge pressure PgP_g at a point located a distance hh below the oil–water interface, but still inside the water layer? (a) Pg=(1800 kg/m3)ghP_g = (1800\,\text{kg/m}^3)gh (b) Pg=(1000 kg/m3)ghP_g = (1000\,\text{kg/m}^3)gh (c) Pg=(800 kg/m3)g(0.30 m)+(1000 kg/m3)ghP_g = (800\,\text{kg/m}^3)g(0.30\,\text{m}) + (1000\,\text{kg/m}^3)gh (d) Pg=(1000 kg/m3)g(h+0.30 m)P_g = (1000\,\text{kg/m}^3)g(h+0.30\,\text{m})

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