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Homework for 4/30/2007 Post-instructional survey 4: Posted at my web page Homework 12 1. How would phases change if the Moon were the same size as Earth, but still had the same mass? The phases would be the same shape, but the visible portion of the moon would appear larger to the eye. 3 correct answer or drawing 2 incorrect answer or drawing 1 attempt, but both answer and drawing incorrect Homework 11 2. How would tides change if the Moon were the same size as Earth, but still had the same mass? The tides would be mostly unaffected because the mass of the Moon would remain the same and so the gravitational force would be nearly the same. There would be different distances of parts of the Moon from the Earth, but that would result in a very small effect. Drawings not to scale. 3 correct answer or drawing 2 incorrect answer or drawing 1 attempt, but both answer and drawing incorrect Homework 11 3. How would eclipses change if the Moon were the same size as Earth, but still had the same mass? Both total and partial solar eclipses would be more frequent because there is a greater chance that the larger Moon would block the Sun. The Earth will have more Moon to block, but a bigger target. Their will be more partial lunar eclipses and fewer total lunar eclipses. Drawings not to scale. 4 correct answer and drawing 3 correct answer or drawing (not both) 2 incorrect answer or drawing 1 attempt, but both answer and drawing incorrect We live about 100 yrs Stars like our Sun live about 10,000,000,000 yrs If we studied a star all of our life we could see only a small fraction of the star’s life. 1 100000000 So how do we know anything about the life of a star? Meet Zip from Ip Zip has the same problem observing us. Zip and his kind live only about 30 seconds and we live about 100 yrs. If zip studied us all of his life he could see only a small fraction of our life. 1 100000000 So what can Zip do? Zip is very intelligent and very fast. He can take measurements of a lot of different people and try to make sense of them. Classification Activity Edward Pickering’s “computers” Williamina Fleming Annie Jump Cannon Antonia Maury Cecilia Payne-Gaposchkin Taking the temperature of stars Well-known Nearest Brightest Hipparcos – 20,000 A thimble full of neutron star material would weigh around 100 million tons – a good sized terrestrial mountain. A 70 kg person standing on the surface of a typical neutron star would weigh around 1 million tons. The person would be flattened to much less than the thickness of a sheet of paper due to the differential pull of gravity. Watching an robot astronaut approach the event horizon (the point where light can’t escape) from a safe distance we would observe -> light from his flashlight would be Everything would appear (red shifted to longer wavelengths shifted) until it was no visible to perfectly normal to longer the robot the human eye until he crossed the event -> his watch would appear to run more horizon. slowly A Trip Through the Universe Hundreds of billions of galaxies with hundreds of billions of stars Material from which the final exam will be drawn: A. B. C. D. E. F. Text and handout content readings. Diagnoser assignments. Pre/Post-assessment. Classroom activities (notebooks). Homework. Power Points from class. The exam will have: A. Short discussion questions. B. Multiple choice. C. Question(s) on a live demonstration. D. Performance part. Classroom Activities Since Exam 2: A. B. C. D. E. F. G. NASA CONNECT Virtual Earth Predicting the Weather Food Web Water Cycle Earth Station Activities Sun-Earth-Moon Relationships Classification of Stars Principles and Fundamental Concepts: A. B. C. D. E. F. G. Earth systems Earth cycles Earth structure Earth processes Earth-Moon-Sun connection Planetary system Stars and Galaxies