Answer:
The amount of workdone by in emptying the tank by pumping the water over the top edge is 
Explanation:
Given that the tank is 6 feet across the top and 5 feet high.
Using the similar triangles.

5r = 3y

Thus; each disc is a circle with area
A = 
The weight of each disc is ;

= 62.4 × 
= 
The distance pumped is 5-y
Thus; the workdone in pumping the tank by pumping the water over the top edge is :


![W = \dfrac{561.6 \pi}{25}[52.083]](https://tex.z-dn.net/?f=W%20%3D%20%5Cdfrac%7B561.6%20%5Cpi%7D%7B25%7D%5B52.083%5D)

The amount of workdone by in emptying the tank by pumping the water over the top edge is 