What type of galaxy has a mix of young and old stars, an abundant amount of gas and dust, ongoing star formation, and a definitive shape?
A. elliptical galaxies
B. irregular galaxies
C. spiral galaxies
D. All types of galaxies share these features
Answer: C
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About how much brighter is a typical star than the light reflected by a planet orbiting around it?
A) a hundred times brighter B) a thousand times brighter C) ten thousand times brighter D) a million times brighter E) a billion times brighter
Chunks of rock and metal that orbit the Sun but are much smaller than the planets are referred to as
A) comets B) dwarf planets C) meteors D) asteroids
A conducting bar of length L rotates with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA ? VP?
a.
?12 mV
b.
+8.0 mV
c.
?8.0 mV
d.
+12 mV
e.
?16 mV
The sidereal drive of a telescope mounting must turn the telescope
a. southward about the polar axis. b. eastward about the polar axis. c. westward about the polar axis. d. northward about the polar axis. e. None of the other choices are correct.