Physics

Problem

A large storage tank with a uniform horizontal surface area of

1.8\,\text{m}^{2}

contains oil of density

850\,\text{kg}\, /\,\text{m}^{3}

. Two identical small holes, each of area

1.2\times10^{-4}\,\text{m}^{2}

, are opened simultaneously at the bottom of the tank when the oil depth is

1.2\,\text{m}

. Determine the time required for the oil depth to decrease to

0.80\,\text{m}

. Ignore viscosity and assume the oil surface remains level and open to the atmosphere throughout.