Question

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 = 9 m and h = 3 m.)

Answer 1

Answer: tank has spherical shape . The distance from the centre of mass =

h+r = 12

Weight of water in tank = 9.8×π×9³×1000×4/3

= 29.926×10⁶ N

to empty the tank Work done = 12 × 29.926 × 10⁶

= 359 × 10⁶ J

= 359 MJ. hope this helps

Explanation: