What is important about the habitable zone around a star that makes astronomers believe life could exist there?
a. The level of UV radiation from the star is minimal there.
b. Only in the life zone can complex organic molecules be found.
c. Planets in the life zone will always have oxygen atmospheres.
d. In the life zone water can exist as a liquid.
d
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The angular resolution of an 8 inch diameter telescope is ________ times greater than that of a 2 inch diameter telescope
A) 8 B) 2 C) 16 D) 4 E) 9
Of all the various .TYPEs of scientific measurements that are possible to make, which type of scientific measurement has given us the most information about the physical universe?
A) Spatial measurements, i.e., measurements of distance, area, and volume. B) Spectroscopy, i.e., measurements of spectra. C) Measurements of mass and weight. D) Energetics, i.e., measurements of the total energy produced by various physical processes. E) Thermometry i.e., measurements of temperature.
When light enters a denser medium, the speed of the light ______________
Fill in the blank(s) with correct word
A stratified liquid flows in an 80-cm-wide, 40-cm-high channel with the density distribution ? (y) = 800(1+ 0.2y) kg/m3 and a uniform velocity distribution of 1.2 m/s, with y measured from the bottom of the channel. The mass flux is nearest:
A) 260 kg/s (B) 280 kg/s (C) 300 kg/s (D) 320 kg/s