Which of the following best illustrates the first law of thermodynamics by Niagara Falls?
a. Water at the top of the falls has high kinetic energy; as the water moves over the waterfall, its kinetic energy is converted into potential energy; when the water reaches the bottom of the waterfall, its potential energy is transformed into other types of energy: heat, sound, and mechanical energy.
b. Water at the top of the falls has high potential energy; as the water moves over the waterfall, its potential energy is converted into kinetic energy; when the water reaches the bottom of the waterfall, its kinetic energy is transformed into other types of energy: heat, sound, and mechanical energy.
c. Water at the top of the falls has high potential energy; as the water moves over the waterfall, its potential energy is converted into kinetic energy; when the water reaches the bottom of the waterfall, its kinetic energy is transformed into potential energy again.
d. Water at the top of the falls has high potential energy; as the water moves over the waterfall, its potential energy is converted into kinetic energy; when the water reaches the bottom of the waterfall, its kinetic energy is lost.
Ans: b. Water at the top of the falls has high potential energy; as the water moves over the waterfall, its potential energy is converted into kinetic energy; when the water reaches the bottom of the waterfall, its kinetic energy is transformed into other types of energy: heat, sound, and mechanical energy.
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