Hw Set Iv '- Physics 1401 (1) Homework Solutions Page 4
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6HW Set IV– page 4 of 6
PHYSICS 1401 (1) homework solutions
8-48 Approximately 5.5 × 10
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kg of water fall 50 m over Niagara Falls each second.
(a) What is the decrease in the gravitational potential energy of the water–Earth
system each second?
(b) If all this energy could be converted to electrical energy (it cannot be), at what
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rate would electrical energy be supplied? (The mass of 1 m
of water is 1000
kg.)
(c) If the electrical energy were sold at 1 cent/kW·h, what would be the yearly cost?
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