A hemispherical tank is filled with water and has a diameter of 10 feet. if water weighs 62.4 pounds per cubic foot, what is the total weight of the water in a full tank, to the nearest pound?

The volume of a sphere is

volume = 4/3 * PI * radius^3

radius = 5 feet

volume = 4/3 * PI * 5^3

sphere volume = 523.6 cubic feet

hemisphere volume = 261.8 cubic feet

Weight of the water = 261.8 * 62.4 = 16,336 pounds