Most of the Seyfert galaxies are ________.
A. spiral
B. irregular
C. elliptical
D. All of these choices are correct.
Answer: A
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Air currents are sensitive to changes in pressure and temperature. In general, air moves from regions of
A) high pressure to regions of low pressure. B) low pressure to regions of high pressure. C) high temperature and low pressure to regions of low temperature and high pressure. D) low temperature and high pressure to regions of high temperature and low pressure.
Suppose you see a photo showing Jupiter half in sunlight and half in shadow (that is, a first quarter Jupiter). This photo might have been taken by ________
A) the Arecibo radio telescope in Puerto Rico B) the Galileo spacecraft that orbited Jupiter in the 1990s C) the Keck telescope on Mauna Kea, Hawaii D) the Hubble Space Telescope (which orbits Earth)
An electron gun sends electrons through a region with an electric field of 
for a distance of 2.5 cm. What is the acceleration of the electrons while in this electric field?
a. 
b. 
c. 
d. 
e. 
The moment of inertia of a solid cylinder about its axis is given by 0.5MR2. If this cylinder rolls without slipping, the ratio of its rotational kinetic energy to its translational kinetic energy is
A) 1:2 B) 1:3 C) 2:1 D) 1:1 E) 3:1