Question

What is the potential energy contained in the water in a lake that has a surface area of 15 square kilometers (km^2), an average depth of 10 meters (m), and an elevation of 100 m above the hydroelectric power plant? Water has a density of (p) 1000 kg/m^3?

Answer 1

Answer:

1.47*10^10J

Explanation:

Given,

g=9.8kgm/s^2

Density(p) =1000kg/m^3

Areea(A)=15km^2

=15*10^6m^2

Height of liquid column(h) =10m

Mass of the liquid(m) =p*A*h

=1000*15*10^6^10

=15*10^10kg

Potential energy=m*g*h

=15*10^10*9.8*10^2

=147*10^12

=1.47*10^10J