If the Moon orbited Earth backward, how would tidal interactions change?
A. The tides would arrive about an hour earlier every day.
B. The length of the day on Earth would increase.
C. The distance between Earth and the Moon would increase.
D. The Moon would not be tidally locked with Earth.
Answer: A
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Red giant stars are I. more luminous than the sun. II. larger in diameter than the sun. III. cooler than B stars. IV. located above the main sequence stars in the H-R diagram
a. I & II b. II & IV c. I, II, & IV d. II, III, & IV e. I, II, III, & IV
On a Hertzsprung-Russell diagram, where would we find stars that are cool and luminous?
A) upper right B) lower right C) upper left D) lower left
The Greeks abandoned their earliest cosmological theory (planets moving in simple circles around Earth) because
A) it did not agree with their observations of the planets.
B) it seemed messy and unsatisfying.
C) they came to believe that Earth should be at the center of things.
D) they came to believe that the sun should be at the center of things.
E) Actually, they never did abandon or revise their earliest theory--it was not altered until the time of Copernicus.
The ______ format has superior transparency capabilities compared to other formats.
A. JPEG B. PNG C. BMP D. GIF