The critical temperature for nucleosynthesis to begin was the:
A) triple alpha reaction at 100 million K.
B) deuterium bottleneck at about 900 million K.
C) proton-proton cycle at 10 million K.
D) iron production at 10 billion K.
E) formation of lithium at 50 million K.
B
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Which of the following is true of carbonaceous chondrites?
A) They contain materials left over from the formation of the Solar System. B) They do not contain any volatile compounds. C) They are a class of iron meteorites. D) They are a class of stony-iron meteorites.
Which of the following is not one of the major types of metamorphism?
a. Contact b. Fold c. Shear d. Regional
What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
a. 980 N b. 200 N c. 98 N d. 49 N e. Some value other than those given above.
In the Northern Hemisphere, hurricane winds spiral
A) counterclockwise in toward the low pressure zone of the storm's eye. B) counterclockwise in toward the high pressure zone of the storm's eye. C) clockwise in toward the low pressure zone of the storm's eye. D) clockwise in toward the high pressure zone of the storm's eye.