MidTerm1_Answers

MidTerm1_Answers - ANSWER KEY ASTRONOMY 3 Prof. McLean...

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ANSWER KEY ASTRONOMY 3 Prof. McLean Dept. Physics & Astronomy UCLA Mid-Term 1 January 25, 2011 Read these Instructions Please bubble-in your name and student ID number on the Scantron . If you do not, there will be no record that you took this exam! Read the questions carefully before marking your answer on the Scantron. Please do your own work; cheating will not be tolerated. There are 45 questions. The allotted time for this test is 45 minutes. NOTE: No one may leave the classroom during the first half of the exam. If you finish early please sit very quietly until permitted to leave.
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The Scientific Method is highly regarded as the best system for the development of new knowledge because a. it only requires one really good advocate or authority figure, like Einstein. b. it is based on theory and does not require confirmation by experiments. c. every hypothesis must be testable against observations or experiments . d. it simply requires faith in unobservable powers and forces. 2. Which phrase best describes the location of planet Earth within the Universe? a. Earth is a planet orbiting a star at the center of the Milky Way galaxy, which is one of over 100 billion galaxies in the observable Universe. b. Earth is a planet orbiting a normal star, one of over 100 billion stars in the Milky Way galaxy, which is one of over 100 billion galaxies in the observable Universe. c. Earth is a planet at the center of the solar system, which contains a special star, the Sun, which is orbiting the center of a galaxy with 100 billion other stars spread through all space. d. Earth is a planet orbiting a star, and that star orbits the center of the Milky Way galaxy, which orbits the center of the Local Group, which orbits the center of the Universe. 3. Suppose we make a scale model of our solar system in which the Sun is reduced to the size of a grapefruit. Which of the following describes the size and distance of Earth on the same scale? a. Earth is the size of a ballpoint about 1 meter away from the Sun b. Earth is the size of a golf ball about 1 meter away from the Sun c. Earth is the size of a ballpoint about 15 meters away from the Sun d. Earth is the size of a golf ball about 15 meters away from the Sun 4. To discuss the scale of the Universe we must use scientific notation because distances in km are too large to write out in full. For example, the distance that light travels in one year is 9,460,000,000,000 km. Write this number in scientific (power of ten) notation. a. 9.46 x 10 12 km b. 946 x 10 10 km c. 9,460 x 10 9 km d. 9.46 x 10 -12 km 5. The Sun, Moon and stars all rise in the east and set in the west because of a. the fact that Earth is in orbit around the Sun. b.
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This note was uploaded on 03/12/2011 for the course ASTRO 3 taught by Professor Mclean during the Winter '11 term at UCLA.

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MidTerm1_Answers - ANSWER KEY ASTRONOMY 3 Prof. McLean...

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