HW3 - H o me wor k 3 D UE: Ap ril 9 th , 2 009 A st r on o...

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Homework 3 Astronomy 100 Dr. Warner DUE: April 9 th , 2009 Note : Unlike the last two homework assignments there are three mandatory questions on this assignment: Questions 6, 8 and 15 are required. These three questions are worth 17 points. As before, you only need to get 40 points in order to have a perfect score, and so you need to select at least another 23 points from the remaining questions. Your score will thus consist of a score out of 17 for the mandatory problems and a score out of 23 for the other problems. You may attempt, and submit more problems, but if your score for these additional problems exceeds 23, then it will be set equal to 23. Please ask me, or the TAs or friends for help. I would like you to assist each other in coming to the right answer. You must, however, understand and write your own answers, and the only way to convince the grader that you have UNDERSTOOD the answer is by EXPLAINING how you got it. Therefore please make sure that you give a SHORT explanation of your answers. Answers that consist of two or three words, (or consist of more than 100 words), will not receive full credit. Most of your explanations would almost certainly benefit if you drew diagrams. Where a calculation is involved, you must show your working. 1. Summarize the evidence supporting the theory that the Cretaceous-Tertiary extinction, which includes the extinction of the dinosaurs, was precipitated to a significant degree by the impact of a meteorite. (3 points) 2. What is the Roche limit of a planet and its role in the formation of ring systems? What would happen to an astronaut who enters the Roche limit of a planet? (2 points) 3. Describe the position, layout and typical inhabitants of the Asteroid Belt, the Kuiper Belt and the Oort Cloud. (5 points) 4. A comet often has two different tails. How are they created, of what do these tails consist and
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HW3 - H o me wor k 3 D UE: Ap ril 9 th , 2 009 A st r on o...

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