Download 11 Questions on Astronomy with Answers - Quiz 2 | AST 192 and more Quizzes Astronomy in PDF only on Docsity! Astronomy 192 Quiz 2: January 28, 2005 Name (please print)_________________KEY__________________ Student Number (Last 4 digits only!) ____0000_________________ Part I. Short answer. (10 points/1 minute each.) 1. Your textbook showed a photograph (which I also showed in lecture) of the region of stars near one of the celestial poles, taken with a two-hour exposure time (the shutter was left open for two hours). The photograph reveals (circle one): A. the precession of the Earth’s axis B. the rotation of the Earth beneath the stars C. Earth’s orbit around the Sun D. the relative motions of the stars E. retrograde motion of the planets 2. Let’s define a new unit of distance, the “light-second”. Express 1 light-second in meters. (Data on the last page may help.) 3. Which list correctly orders these periodic phenomena in terms of increasing period? (Circle one.) A. Earth’s orbit, Earth’s rotation, Lunar phases, Milky-Way rotation, Earth’s precession B. Lunar phases, Earth’s precession, Earth’s orbit, Earth’s rotation, Milky-Way’s rotation C. Milky-Way’s rotation, Earth’s precession, Earth’s orbit, Earth’s precession, Milky-Way’s rotation D. Earth’s rotation, Lunar phases, Earth’s orbit, Earth’s precession, Milky-Way’s rotation E. Earth’s precession, Milky-Way rotation, Lunar phases, Earth’s rotation, Earth’s orbit. 4. A soccer field is 100 meters long. A soccer player is 2 meters tall. A clay model of the field and player, in which the field is 15 inches long, has a model player that is how tall? 0.3 inches 3 x 108 m Part II. Calculations. (10 points/2 minutes each.) Please write all answers in scientific notation in the appropriate box. Imagine that the Earth had many Moons, strung like pearls or beads across the sky. The distance from the center of the Earth to the center of the Moon is called R. The diameter of the Moon (which is twice its radius) is called D. A. Given the data in Table 1, calculate the number of Moons that would be necessary to entirely encircle the Earth like a string of pearls. (Round your answer to the nearest whole Moon!) B. So what fraction of the string of Moons is occupied by our single Moon? C. The angular measure of a full circle is defined as 360º. Use your answer to Part B to calculate the angular size of our single Moon. 695 1/695 0.52º Table 1 D = 3.476 x 103 km R = 384.4 x 103 km
