A spherical oil tank with a radius of 10 feet is half full of oil that weighs 60 pounds per cubic foot. Its top is 6 feet underground. How much work is needed to pump the oil out of the tank through a hole in its top?
How do I solve this? Does the fact that it its top is 6 feet underground change the work needed than if it wasn't underground?
Really a physics question.
I know that Work = Force x distance.