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Calculus 2 / Physics

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An underground tank full of water has the following shape
1) hemisphere of radius 5 m at the bottom
2) a cylinder of radius 5 m and height 10 m in the middle
3) a circular cone with base radius 5 and height 4 m at the top

The top of the tan is 2 m below the ground surface and is connected to the surface by a spout. Find the work required to empty the tank by pumping all of the water out of the tank up to the surface
Density of water = 1000kg/m^3
Gravity = 10m/s^2

I am doing it so I find the work done of all three (three different parts) then adding the all 3 work done to get the final answer. I really just need help solving the hemisphere I do not even know where to begin! Someone please help me solve this!

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