The metric system is preferred over the British system in science for the following main reason
A) The metric system is more precise than the British system.
B) Metric quantities can be defined more accurately than the quantities in the British system.
C) Metric quantities are natural whereas British quantities are invented.
D) Conversions between metric quantities are especially easy because they are all related by factors of ten.
D
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Air that flows northward from the horse latitudes in the Northern Hemisphere produces the
A) Gulf Stream. B) trade winds. C) westerlies. D) Kuroshio current.
A heat engine receives 7 900 J of heat from its combustion process and loses 3 200 J through the exhaust and friction. What is its efficiency?
a. 59% b. 35% c. 21% d. 41% e. 77%
A heat engine operates between 800 K and 300 K, but its efficiency is only 80% of the maximum possible. What is the actual efficiency of the engine?
A) 30% B) 70% C) 38% D) 50% E) 36%
For an ideal inductor in an ac circuit, how much energy is stored in the inductor at the instant when the current is zero?
A. maximum B. 1?2 maximum C. 0.707 maximum D. zero