Wind blowing over the top of a hill
A) increases atmospheric pressure there.
B) decreases atmospheric pressure there.
C) does not affect atmospheric pressure there.
Answer: B
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The longitudinal strength of wood is due to the high strength of crystalline _________cells.
Fill in the blank(s) with the appropriate word(s).
Explain how a POSITIVE acceleration could produce a DECELERATION
What will be an ideal response?
How do we know the expansion of the universe is accelerating?
A) We're really not that sure the expansion is accelerating; it's all just a theory. B) The rotation curves of galaxies indicate the universe is speeding up. C) White dwarf supernova in distant galaxies are fainter than they would be if the expansion were not accelerating. D) Redshifts of distant galaxies are increasing with time, so when we repeat the measurements, the redshifts are larger. E) We see more of the universe every night, as the observable universe grows in size.
Why is light variability a critical issue with the sizes of active nuclei?
What will be an ideal response?