What is likely if the particulate NAAQS is exceeded by a factor of 10? Explain
What will be an ideal response?
A tenfold increase would make the concentration around 500 mg/m3, very high
(while still only one-third of the maximum levels characteristic of the deadly London smog,
see Fig. 14.4). Particulates have a high toxicity (Table 14.6), so we would expect a large
increase in symptoms reported from susceptible groups as well as long-term damage to
lungs of exposed people who might not exhibit symptoms.
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Why do we conclude that a starburst must represent only a temporary stage in galaxy evolution?
A) We observe starbursts to last only a few years in any individual galaxy before the starburst ends. B) The star formation rate of a starburst would consume all available gas for star formation in a time much shorter than the age of the universe. C) We don't see any starbursts occurring in nearby galaxies. D) Galaxies with starbursts are all very far away, indicating that these starbursts occurred only very long ago.
Astronomers have measured the Milky Way's mass by
A. observing its gravitational attraction on matter in and near it. B. using radar. C. sending unmanned space missions to the center of the Galaxy. D. observing magnetic fields in the Solar System.
Coronal holes are cooler parts of the corona from which the solar wind escapes.
Answer the following statement true (T) or false (F)
A rifle is aimed horizontally toward the center of a target 71 m away. If the bullet strikes 10 cm below the center, what was the velocity of the bullet? Note: Ignore air friction
a. 300 m/s c. 500 m/s b. 330 m/s d. 700 m/s