Answer:
Et = 30018 [W]
Explanation:
To solve this problem we must use the definition of potential energy, which is expressed by the following equation:
[tex]E_{p} =m*g*h[/tex]
where:
Ep = potencial energy [W]
g = gravity acceleration [m/s^2]
h = elevation = 120 [m]
m = mass flow = [1800/min]
But in order to get watts into potential energy, we must convert the mass flow from kilograms per minute to kilograms per second.
[tex]1800[\frac{kg}{min} ]*\frac{1}{60}\frac{min}{s}=30[\frac{kg}{s} ][/tex]
Ep = 30*9.81*120
Ep = 35316 [W]
If we use  85% of the potential  energy will have:
Et = 35316*0.85
Et = 30018 [W]
