Find the volume of the tank:
V=πr2h
r=3ft=0.9144m
h=10ft=3.048m
V=π∗0.91442∗3.048≈8m3
Let’s calculate the water mass in the tank
m=ρV=1000∗8=8000kg
Calculate the potential energy of the water in the tank
Ep=mghc
hc−height of the center of gravity of the tank
relative to the ground level
hc=50+10/2=55ft=16.764m
Ep=mghc=8000∗9.8∗16.764=1314 297.6J
the potential energy of the same mass of water
at ground level will be 0 since the height is 0
Ep0=0
W=ΔP=1314 297.6J
Answer: 1314297.6 J
Comments