If you were to come back to Earth in 150 million year's time, what would a map of the planet look like compared to today?
A) so completely different that none of our current continents would be recognizable
B) only slightly different because plate motion is extremely slow
C) exactly the same because plate tectonics is no longer occurring
D) quite different because plate tectonics would have caused a shift in the position of the continents
D
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A thin rod is pivoted around its end, and an identical rod around its center. If they are to have the same rotational kinetic energy, then
A. 2 B. 1 C. 1/2 D. 1/4 E. 4
While more massive than most of its neighbors, the Sun is still technically a low mass star
Indicate whether the statement is true or false
Give at least one example of each of the following:
(a) longitudinal standing wave. (b) transverse standing wave.
Suppose you charge two transparencies by rubbing and then hold them near each other without letting them touch, and shake both of them back and forth. Regarding the electric and magnetic forces they exert on each other,
A) they will exert both and electric and magnetic forces. B) they will exert neither electric nor magnetic forces because they are not in contact with each other. C) they will exert electric forces but not magnetic forces. D) they will exert magnetic forces but not electric forces. E) they will exert electromagnetic forces only after five o'clock on Friday afternoons.