If you lived on the Moon how often would the Earth set below your horizon?
a. Every 24 hours
b. Once a sidereal period (27.3 days)
c. Once a synodic period (29.5 days)
d. Every year
e. Never
E
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A real object is place a distance d from a converging lens. The object is then moved to a distance 2d from the converging lens. Which of the following statements is false?
a. The image in the first case with the object at distance d can be the larger one. b. The image in the second case with the object at distance 2d can be the larger one. c. If both images are real, the image in the second case is smaller. d. If the image in the first case is real, the image in the second case is upright.
Driscoll et al.(365) write that: "Without strong acid anions, cation leaching in forest soils of the Northeast is driven largely by naturally occurring organic acids derived from the decomposition of organic matter, which takes place primarily in
the forest floor. ... [O]rganic acids tend to mobilize Al through formation of organic–Al complexes, most of which are deposited lower in the soil profile ... This process ... results in surface waters with low concentrations of Al. ... Acidic deposition to forest soils with base saturation values less than 20% increases Al mobilization and shifts chemical speciation of Al from organic to inorganic forms that are toxic to terrestrial and aquatic biota." Exactly what are they saying? Explain.
When astronomers use Hubble's law to measure the distance to a galaxy they have to measure the ________ of the galaxy.
A. mass B. recessional speed C. rotational speed D. luminosity
Which is longer, the sidereal or solar day? By how much?
What will be an ideal response?