According to the graph, an object 10 kilometers across hits Earth __________.
A. about once every 1 million years
B. about once every 100 million years
C. about once every 1 billion years
D. just once in Earth's history
Ans: B. about once every 100 million years
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The strong tendency of certain minerals to break along smooth, parallel planes is known as ________.
Fill in the blank(s) with the appropriate word(s).
The very earliest Greek theory of the structure of the universe pictured Earth at the center with the planets revolving around it at an unchanging rate in simple circles. The Greeks later revised this theory because
A) they didn't believe the theory was sufficiently beautiful to represent the eternal gods. B) they observed that the planetary motions are irregular and include such things as retrograde motion. C) certain observations led them to the conclusion that Earth has a spherical shape. D) they came to believe that the sun should be at the center of things. E) Actually, the Greeks never did abandon this theory--the theory was not altered until the time of Copernicus.
How much heat is required to change one gram of 0°C ice to 120°C steam?
A) 48.7 cal B) 120 cal C) 540 cal D) 730 cal E) 1505 cal
How does quantum mechanics undermine the idea of determinism in physics?
a. Imperfect physics measurements leading to uncertainty in predictions. b. As described by Einstein's comment, "[God] is not playing at dice." c. Imperfect quantum physics measurements leading to uncertainty in predictions. d. Acceptance of the Heisenberg uncertainty principle. e. The discovery of "hidden variables."