The root mean square speed of a gas molecule is greater than the average speed, because the former gives a greater weight to
a. lighter molecules.
b. heavier molecules.
c. lower speeds.
d. higher speeds.
e. more probable speeds.
D
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In general, you should choose existing content designed for print rather than creating original content elements prepared for the web.
Answer the following statement true (T) or false (F)
Astronomers believe that dark matter exists because
A. the galaxies in clusters move slower than expected on the basis of the material visible in them. B. they can detect it with radio telescopes. C. the outer parts of galaxies rotate faster than expected on the basis of the material visible in them. D. it is the only way to explain the black holes in active galaxies. E. All of these choices are correct.
How can a white dwarf be hotter than our Sun, yet much less luminous?
What will be an ideal response?
Enrico says that positive charge is created when you rub a glass rod with silk, and that negative charge is simply the absence of positive charge. Rosetta says that negative charge is created and that positive charge is the absence of positive charge. (She has heard that Ben Franklin should have reversed the signs he associated with the charges.) Which one, if either, is correct?
a. Enrico, because there really is only one kind of charge. b. Rosetta, because there really is only one kind of charge. c. Neither: although no charge is present originally, both types of charge are created through friction. d. Both: only one type of charge is created by friction at any one time. e. Neither: both negative and positive charge are present simultaneously in all solid materials on Earth and the process described involves a transfer of charge, not the creation of charge.