(i) Compute the change in potential energy of 2.4 kg of water as it passes over Niagara Falls (a vertical descent of 50 m).
(ii) At what rate is the gravitational potential energy lost by the water of the Niagara River? The rate of flow is around 5.5 x 106 kg/s.
(iii) When 16% of the energy can be transformed into electrical energy, determine how many households would the electricity supply? (The average household employs an average electrical power of around 1 kW.)