Energy efficiency is ________
A) a measurement of overall energy use
B) reducing energy wastes
C) increasing demand but decreasing accessibility of various energy sources
D) the amount of energy used per dollar of economic output
E) the process of using less energy to obtain goods and services
E
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Both ends of the rope used during a steady tug-of-war have
A. tensions that relate to the participants. B. unequal tensions. C. equal tensions. D. none of the above
The concepts of velocity and acceleration are
A. very different from each other. B. different names for the same idea. C. concepts developed by Aristotle. D. none of the above
On a large urban or industrial scale, biogas can be produced
A) by using crushed fresh corn in an aerobic tank. B) from municipal wastewater treatment, landfills and food waste. C) using enzymes to degrade cellulose to glucose and then fermenting. D) drilling into areas adjacent to petroleum deposits.
Streams erode rock and sediment by ________.
A. abrasion B. solution C. hydraulic action D. All answers are correct. E. None of the answers are correct.