Diagram 7-1 shows a plot of the temperature of the Sun as a function of distance above the bottom of the photosphere. What is the temperature of the Sun at a distance of 2,000 km?
D
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A reflecting telescope differs from a refracting telescope by using:
a. a concave mirror. b. a convex mirror. c. a system of five converging lenses. d. two converging lenses. e. a single converging lens.
The formation of more protons than neutrons (at about a 7:1. ratio) was favored in the early universe because
A) it takes more energy to create a neutron from a proton than a proton from a neutron. B) it takes more energy to create a proton from a neutron than a neutron from a proton. C) the more massive neutrons made better targets for nucleon collisions. D) the positively charged protons were repelled away from the explosion.
The light-collecting area of an 8-meter telescope is ________ times that of a 2-meter telescope.
A) 16 B) 4 C) 8 D) 6
A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80
downward. What is the total time of flight?
A. 6.02 s B. 6.91 s C. 7.23 s D. 7.44 s E. 8.02 s