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Which of the following is the only substance that is found naturally in the atmosphere near the Earth's surface as a solid, a liquid, and a gas?
A. water B. carbon dioxide C. ozone D. molecular oxygen
A drawback of lead-acid batteries being used to store large amounts of energy is
A. They can store only moderate amounts of energy per unit mass, the acid is corrosive, and they require an operating temperature of almost 600°F. B. The acid is corrosive. C. They can store only moderate amounts of energy per unit mass. D. They require an operating temperature of almost 600°F. E. They can store only moderate amounts of energy per unit mass and the acid is corrosive.
Two charges separated by one meter exert a 1-N force on each other. If the charges are pushed to 0.25-m separation, the force on each charge will be
A) 1 N. B) 2 N. C) 4 N. D) 8 N. E) 16 N.
Stream transport involves all of the following except
A) dissolved load. B) saltation. C) sheet flow. D) traction. E) bed load.