A tank has the shape of an inverted circular cone with height 18 m and base radius 3 m. The tank is filled completely to: start, and water is pumped over the upper edge of the tank until the height of the water remaining in the tank is 12 m. How much work is required to pump out that amount of water? Use the fact that acceleration due to gravity is 9.8 m/sec² and the density of water is 1000 kg/m³. Round your answer to the nearest kilojoule.
