A fountain sends water to a height of 50 m. What must be the pressurization (above atmospheric) of the underground water system? (1 atm = 105 N/m2)
a. 1 atm
c. 7.2 atm
b. 4.9 atm
d. 9.8 atm
B
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An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
The density of a column of air decreases as altitude increases because
A. Air contracts as pressure decreases B. Air expands as pressure decreases C. Nonsense, the density of air is constant. D. Nonsense, the density of air increases as altitude increases.
Although low luminosity stars are very common, the probability of individual stars having planets within their habitable zones is low because low luminosity stars
A) are not expected to form rocky, terrestrial planets B) have very narrow habitable zones C) have no habitable zones at all D) are very unstable
The Sun lives in which component of the Milky Way?
A) a globular cluster B) the disk C) the halo D) the bulge