What kind of galaxy is the Milky Way?
A) an irregular galaxy
B) a spiral galaxy
C) an elliptical galaxy
C) an elliptical galaxy
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What is the power factor for a series ac circuit containing a 50-? resistor, a 10-?F capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?
A) 0.00 B) 0.46 C) 1.0 D) 0.79
Which two circuits are exactly equivalent?
a.
A and B
b.
B and C
c.
C and D
d.
D and E
e.
B and E
Which of the following is not a piece of evidence supporting the idea that an impact caused the mass extinction that occurred 65 million years ago?
A) Fossilized dinosaur bones contain fragments of rock from the impact. B) Unusually large abundances of iridium and other rare metals are found in a layer of clay that dates to 65 million years ago. C) A large impact crater along the coast of Mexico dates to 65 million years ago. D) Grains of quartz formed under high pressure are found in a layer of clay that dates to 65 million years ago.
Arrange the atoms calcium, barium, chlorine, and bromine in order of increasing atomic radius