Question

how much energy has 4*10^10m^3 of water collected in a reservoir at a height of 100 m from the power house? i need the equation and no i dont know what Hnet or Hgross is .​

Answer 1

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$Ep=mghEp=mgh$

$The \: mass \: of \: the \: water \: reservoir is$

$m=Vρm=Vρ (ρρ is density of water: 1000 kg/m³)$

$Ep=VρghEp=Vρgh$

$Ep=4⋅1010m3×103kg/m3×9.8m$

$/s2×100mEp=4⋅1010m \\ 3×103kg/m3×9.8m/s2×100m$

$Ep=3.921016J$