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Chapter 6, Problem 6QAP

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How many impacts would you expect to strike a 100m2 region in one hour during Earth’s formation, assuming that Earth grew to its present size in 10 million years from particles averaging 100 grams each? (Hint: Assume that Earth had its current radius of 6378km.) (Notes: The surface area of a sphere is 4pir2 ; 1yr=3.2x107 .) a. About 1300. b. About 13 . c. About 13,000. d. About 130

Earth's atmosphere contains just a small amount of carbon dioxide at the present time, because Earth's volcanoes did not outgas as much carbon dioxide as those on Mars and Venus Chemical reactions with other gases destroyed the carbon dioxide and replaced it with Nitrogen Carbon dioxide dissolves in water, and now most of it is contained in oceans and carbonate rocks Most of the carbon dioxide was lost during the 'heavy bombardment' phase

We think the terrestrial planets formed around solid “seeds” that later grew over time through the accretion of rocks and metals. a) Suppose the Earth grew to its present size in 1 million years through the accretion of particles averaging 100 grams each. On average, how many particles did the Earth capture per second, given that the mass of the Earth is = 5.972 × 10 ^24 kg ? b) If you stood on Earth during its formation and watched a region covering 100 m^2, how many impacts would you expect to see in one hour. Use the impact rate you calculated in part a. You’ll need the following as well: the radius of the Earth is = 6.371 × 10 ^6 m and the surface area of the Earth is 4??^2Earth