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Thread moved from the technical forums to the schoolwork forums

Hey all,

I am working through some practice problems and am stuck at the following one:

"A cylindrical tank 10m high has an internal diameter of 4m. How much work would be required to fill the tank with water if the water were pumped in i.) at the bottom and ii.) over the top edge?"

Part i is simple enough via applying potential energy formula but for part ii, the solution says that it takes twice as much work but I am having difficulty seeing why.

Any help would be appreciated!

I am working through some practice problems and am stuck at the following one:

"A cylindrical tank 10m high has an internal diameter of 4m. How much work would be required to fill the tank with water if the water were pumped in i.) at the bottom and ii.) over the top edge?"

Part i is simple enough via applying potential energy formula but for part ii, the solution says that it takes twice as much work but I am having difficulty seeing why.

Any help would be appreciated!