Briefly explain why Mercury, Venus, and the Moon do not have significant erosion. Relate erosional activity to the four planetary formation properties
What will be an ideal response?
Mercury has a negligible atmosphere from the point of view of erosion, primarily due to its high temperature, related to its distance from the Sun. Its relatively small size also led to only a small amount of outgassing to form an atmosphere in the first place. The Moon also has a negligible atmosphere, primarily related to the inability of such a small world to create or retain an atmosphere. Venus has a great deal of atmosphere but very little erosion. Water erosion doesn't occur because the planet is too hot, related to its distance from the Sun. It lacks significant wind erosion because its slow rotation rate leads to very slow winds.
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Find the orbital speed of an ice cube in the rings of Saturn. The mass of Saturn is 5.68 × 1026 kg and the rings have an average radius of 100,000 km. (G = 6.67 × 10-11 N ? m2/kg2)
A) 19.5 km/s B) 27.5 km/s C) 13.8 km/s D) 1.95 km/s
Nearly all the elements found in nature were formed inside stars, EXCEPT for:
A) carbon and silicon. B) hydrogen and helium. C) helium and carbon. D) silver and technetium. E) uranium and radium.
A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth,
Andrea rides on a space ship which travels away from Earth at a speed of 0.6c for five years (as measured by Courtney), then turns around and comes back at 0.6c. When Andrea returns, Courtney is 20 years old. How old is Andrea upon her return? A) 10 years B) 12 years C) 15 years D) 18 years E) 20 years
Most lunar craters are volcanic in origin
Indicate whether the statement is true or false