"a tank is full of water. find the work required to pump the water out of the spout. (use 9.8 m/s2 for g. use 1000 kg/m3 as the density of water. assume r = 3 m and h = 1 m.)
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Distance = 3+1 = 4 m
Weight of water = 9.8*Pi*9^3*1000*4/3
                          = 29.926*10^6 N 
Work done = 4 * 29.926 * 10^6
                  = 119.70 × 10^6 J
                  = 119.70 MJ.

The density of the cube is 40

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