Using solar energy is not quite so simple because converting light into heat remains quite inefficient.
a. true
b. false
Ans: a. true
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A thin math book and a thick science book are joined by a string on a horizontal friction-free table. One book is pushed off the edge of the table. As it falls, the other book (different mass) is dragged horizontally across the table surface. Acceleration of the books is
A. between zero and g. B. g. C. zero. D. g/2. E. greater than g.
Which one of the following is TRUE regarding tsunamis?
a. they travel as deep-water waves at speeds greater than surface seismic waves but slower than S waves b. their wave heights decrease and wavelengths increase as they move into shallower water c. they are started by fault-induced, horizontal shifts in the seafloor that suddenly propel great masses of water in opposite directions d. they occur in the open ocean, wavelengths are many miles or kilometers and wave heights are only a few feet
In a warmer world, which of the following changes will likely happen to the growing season at higher latitudes?
A. The growing season will remain unchanged. B. The growing season will be shorter at first, but then will be longer. C. The growing season will be shorter. D. The growing season will be longer.
Which of the following will give a positive test with Tollens' reagent?
A) carboxylic acids B) ketones C) both a and b D) neither a nor b