A tank is filled with liquid of density 1000 [kg/m3 ]. Its shape is obtained by rotating the curve y =√x, 0 ≤ x ≤ 4, around the y-axis. Find the work that is required to pump all the liquid out of the tank, from the top of the tank. All the lengths are in units of meter [m]. Do not forget to use gravitational constant g = 9.8[m/s2 ].
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