Which kind of robotic space mission enables us to determine the chemical composition of a planet's surface and atmosphere remotely?
A) sample return
B) lander/probe
C) orbiter
D) flyby
B
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Why are supermassive galaxies often found at the cores of rich galaxy clusters?
A) Most of the matter forming the cluster fell into the center to form one large galaxy. B) They are the result of many galactic mergers; one galaxy growing at the expense of others. C) Such a large galaxy attracted smaller galaxies around it to form a cluster. D) Large galaxies, passing a cluster, get captured into the center. E) Many globular clusters swarmed together to form it.
The energy of a system
a. always increases. b. always remains constant. c. increases when work is done by the system. d. increases when work is done on the system.
Resistance and Resistivity: Copper wire #1 has a length L and a radius b. Copper wire #2 has a length 2L and a radius 2b. Which statement about the resistance across the ends of the wires is true?
A. The resistance of wire #1 is twice as high as that of wire #2. B. The resistance of wire #1 is equal to that of wire #2. C. The resistance of wire #1 is half that of wire #2. D. The resistance of wire #1 is four times higher than that of wire #2.
Total Internal Reflection: The critical angle for a substance in air is measured at 53.7°. If light enters this substance from air at 45.0° with the normal, at what angle with the normal will it continue to travel?
A. 34.7° B. 45.0° C. 53.7° D. It will not continue, but will be totally reflected.