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**1. (a) Calculate the change in potential energy of 1.8 kg of water as it passes over Niagara Falls (a vertical descent of 50 m).**

______ J

(b) At what rate is gravitational potential energy lost by the water of the Niagara River? The rate of flow is 5.5 106 kg/s.

______GW

(c) If 27% of this energy can be converted into electrical energy, how many households would the electricity supply? (An average household uses an average electrical power of about 1 kW.)

______Households

______ J

(b) At what rate is gravitational potential energy lost by the water of the Niagara River? The rate of flow is 5.5 106 kg/s.

______GW

(c) If 27% of this energy can be converted into electrical energy, how many households would the electricity supply? (An average household uses an average electrical power of about 1 kW.)

______Households

**2. Homework Equations**

on a i tried m*g*h but got the incorrect answer

**3. The Attempt at a Solution**

a. 882