Which of the following is the most basic definition of a greenhouse gas?
A) a gas that absorbs infrared light
B) a gas that makes a planet much hotter than it would be otherwise, even in small amounts
C) a gas that keeps warms air from rising, and therefore warms the surface
D) a gas that reflects a lot of sunlight
A) a gas that absorbs infrared light
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In general, warm days are associated with
A) high surface pressure. B) low surface pressure. C) summer storms. D) negative change in pressure gradient.
A student adds two displacement vectors that have the magnitudes of 12.0 m and 5.0 m. What is the range of possible answers for the magnitude of the resultant vector?
What will be an ideal response?
A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about
A) 6 km/h. B) 8 km/h. C) 10 km/h. D) 20 km/h.
Identify a true statement about main-sequence stars
A) They balance their gravity by fusing hydrogen. B) They generate energy by breaking uranium isotopes. C) They do not increase in size as they consume their fuel. D) They do not undergo any molecular change during their life spans.