The mass of a single galaxy might be found by
a. the double galaxy method.
b. the rotation curve method.
c. the cluster method.
d. any of the methods (i.e., double galaxy, rotation curve, cluster)
e. none of these methods.
b
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The atmosphere of Venus consists mainly of ________.
A. sulfuric acid B. nitrogen and oxygen C. carbon monoxide D. hydrogen and helium E. carbon dioxide
Assume a gram of a substance marketed as "Pure Energy" is annihilated by a gram of a second substance "Anti-Pure Energy." How long would the energy released power a city which uses 109 watts of power?
a. 40 hrs b. 25 hrs c. 50 hrs d. 65 hrs e. 50000 hrs
A normal lapse rate of 2.7 °F/1000 ft is equivalent to
a. 3.5 °C/m. b. 1.5 °C/1000 ft. c. 5.0 °C/1000 ft. d. 6.5 °C/1000 ft.
Binary star systems are thought to form when
A) gravity pulls two neighboring protostars quite close together, but angular momentum causes them to orbit each other rather than collide. B) two interstellar gas clouds happen to contract so close together that there's no room for a disk or planets. C) the protostellar disk around a protostar has enough material to form a second star. D) a protostar emits two jets, each of which turns into a star.