For centuries, people have tried to invent perpetual motion machines to move water uphill or to do other work without an external energy source. Why have these attempts always failed?
A. first and second laws of thermodynamics
B. law of conservation of matter
C. lack of scientific understanding
D. inadequate technological advancement
Answer: A
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The average speed of a ball rolling along a horizontal track will be increased if the track
A. has a dip along it. B. has a hump along it. C. both of these D. not enough information
Culture is found only among ethnically homogeneous groups
Indicate whether this statement is true or false.
Which of the following represents the "three Rs" of waste disposal in the descending order of energy expenditure?
A. Reuse, reduce, recycle B. Reduce, recycle, reuse C. Recycle, reduce, reuse D. Recycle, reuse, reduce E. Reuse, recycle, reduce