1. Large meteorites are hardly slowed by Earth’s atmosphere. Assuming the atmosphere is 100 km…

1. Large meteorites are hardly slowed by Earth’s atmosphere. Assuming the atmosphere is 100 km thick and that a large meteorite falls perpendicular to the surface, how long does it take to reach the ground? (Hint: Refer to the text for typical speeds of meteoroids.) 2. If a single asteroid 1 km in diameter were to be fragmented into meteoroids 1 m in diameter, how many would it yield? (Hint: The volume of a  

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