Lecture23 - Astro Nova Friday April 13, 2029 asteroid 99942...

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Astro Nova Friday April 13, 2029 asteroid 99942 Apophis will pass within 20,000 miles of Earth (within geosynchronous satellite orbit) 13 yr old German student calculated collision with satellite would raise chance of future impact with Earth (in 2036) to 1 in 450! wide press coverage: “I’ve calculated the end of the world … and NASA says I’m right!” doubly incorrect: Chance of hitting satellite nil – wrong orbital plane Asteroid mass ~20 million tons – collision would have negligible effect
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Final Exam Wednesday May 14 9:00 am – 10:30 am Physics Lecture Hall Closed book and notes Computer-graded multiple-choice questions Material covered: Text chapters 22 - 27 Lectures 15-27 (March 13 through May 1) Bring Student ID card and a #2 pencil Practice Exam on class web page soon
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Makeup Final Exam Monday May 12, noon – 1:30 pm SEC 203 Only for those with verified exam conflicts or Dean’s notes
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Extra Credit Submit multiple-choice questions for final exam (with 5 answer choices). Email submission preferred Deadline: 5 pm Monday, May 5 Accepted questions replace low quiz scores with perfect scores – up to 2 quizzes replaced
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Previous Lecture Cosmology and Universe definitions Redshift-distance law implies expansion nature of expansion General Relativity and cosmology Cosmological Principle 3 types of solutions for universe density parameter Observational cosmology result: accelerating universe
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Quiz Question #1 In the previous lecture, how many students volunteers were needed to demonstrate the expansion of the universe? A. None B. 1 C. 2 D. 3 E. 4
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Quiz Question #2 What does the term isotropic mean? A. The same temperature everywhere B. The same at every point C. The same in every direction D. The same entropy everywhere E. Located between 23.5º N and 23.5º S latitude
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Which of the three possible types of universe
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Lecture23 - Astro Nova Friday April 13, 2029 asteroid 99942...

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