Why has direct imaging found so few exoplanets?
A) Direct imaging is only possible using military satellites.
B) Direct imaging only works if the planet is orbiting a brown dwarf.
C) Only a few attempts have been made to directly image an extrasolar planet.
D) Exoplanets are faint and are usually close to their parent stars.
D
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Magnifying Glass With the Image at the Near Point of the Eye: A person with normal eyesight uses a converging lens of focal length 10 cm as a magnifying glass to finish an engraving job. To see detail, he holds the lens very close to his eyes. At what minimum distance from the job must he hold the lens?
A. 14 cm B. 7.1 cm C. 9.4 cm D. 30 cm E. 20 cm
The base SI unit of mass is
A) milligram. B) gram. C) kilogram. D) slug. E) newton.
Why can't the carbon dioxide cycle easily correct for the increasing amounts of carbon dioxide introduced into our atmosphere by industrialization?
A) it operates far too slowly to correct for any short-term changes B) pollution has stopped the carbon dioxide cycle from operating C) the carbon dioxide cycle only influences carbon dioxide produced by natural sources D) it operates far too quickly to correct for any short-term changes
An ideal gas is allowed to expand slowly. The system is thermally isolated. Which statement regarding the final temperature is true?