The most basic difference between elliptical galaxies and spiral galaxies is that ________
A) elliptical galaxies are very old and spiral galaxies are very young
B) elliptical galaxies lack anything resembling the disk of a spiral galaxy
C) elliptical galaxies have a spheroidal component (of stars distributed spherically about the galactic center), and spiral galaxies do not
D) elliptical galaxies lack anything resembling the halo of a spiral galaxy
B
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Thin Lenses: Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.)
A. The image is always real. B. The image is always virtual. C. The image is always inverted. D. The image is always upright. E. None of these choices are correct.
Work Done by a Gas: A gas expands at constant temperature from an initial volume of 0.040 m3 and an initial pressure of 210 kPa until its pressure drops to 135 kPa. How much work is done by the gas during this expansion? (R = 8.31 J/mol ? K)
A. 3.0 kJ B. 3.7 kJ C. 4.1 kJ D. 5.6 kJ E. 7.9 kJ
Which of these problems arise partly from nuclear power plants but not from coal-fired power plants?
A) solid waste disposal problems B) proliferation of nuclear weapons C) thermal pollution of lakes or rivers D) All of the above. E) None of the above.
A headwaiter at a restaurant decides to apply the exclusion principle to the seating of patrons. He will treat tables as sub-shells, and will only seat patrons if the number of the people to be seated adds up to a complete sub-shell. Of the numbers below, the number he would not be willing to seat at one table is
a. 2. b. 4. c. 6. d. 10. e. 14.