___________ of the Milky Way contains mostly old (population II) stars and globular clusters
a. The disk component
b. The spherical halo component
c. The hydrogen gas in the disk
d. The spiral arms
e. Sgr A
.E
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The potential differences around a loop ABCA in a circuit (starting at A and going back to 
A. 16 V B. 4.0 V C. -4.0 V D. -16 V E. -12 V
The oldest fossil records date back about
a) 100 years. b) 6 thousand years. c) 2 million years. d) 3500 million years.
An object is moving with constant velocity in a straight line. Which of the following statements is true?
A) A constant force is being applied in the direction of motion. B) A constant force is being applied in the direction opposite of motion. C) There are no forces acting on the object. D) The net force on the object is zero. E) There is no frictional force acting on the object.
The percentage of electricity from nuclear power generated in recent decades in the United States has been about
A) 10%. B) 20%. C) 30%. D) 40%. E) more than 40%