Can someone please explain the steps with a diameter of 4

Last updated: 5/3/2023

Can someone please explain the steps with a diameter of 4 feet and a height of 9 feet This trough is conical in shape and is filled with a liquid that weights tbs per cubic foot The depth of the liquid is at 7 feet What is the amount of work in ft lbs that is required to empty the conical trough by pumping the water over the top