Exam2Spring2011KEY - EXAM#2 ASTRONOMY 1002 NAME_KEY...

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1 EXAM#2 ASTRONOMY 1002 Wednesday, March 30, 2011 NAME____________ KEY Answers in bold._____________ NOTE: Exam is printed on BOTH SIDES! THIS IS A CLOSED BOOK EXAM. NO NOTES ARE ALLOWED. YOU MAY USE A CALCULATOR. Please mark your answers and also any math you do on the test sheets so that we can check for any recording errors afterwards. Here are some equations and fundamental constants that may (or not) be useful to you. 5 / ) 5 ( 10 + = v v M m d E = mc 2 z = Δλ / λ 0 d = 1/p p=1/d T = 1/H 1 parsec = 3.1 x 10 13 km 1 year = 3.15 x 10 7 seconds M = A 3 /P 2 , t = 1/M 3 , R = L 1/2 / T 2 , v = at, s = ½ at 2
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2 Problem 1. The largest moon of Saturn, explored by the Huygens sub-module of Cassini, is: a) Umbillica. b) Ganymede. c) Diopter Maxima. d) Triton. e) Titan. Problem 2. Of the 4 Galilean moons, the closest one to Jupiter, and most affected by tidal forces is: a) Callisto. b) Titanium. c) Io. d) Erroneous. e) Ganymede. Problem 3. The rings of the Jovian planets are stabilized by: a) The large planetary magnetic fields. b) Interaction with the Trojan asteroid system. c) The constant “rain” of meteor showers. d) The “pull” of asteroids like Dactyl and Ida. e) Shepherding satellites Problem 4. The main NASA mission that explored Jupiter and its moons was: a) the Pioneer mission b) the Cassini mission c) the Voyager mission d) the Galileo mission. e) the Messenger mission. Problem 5. The way NASA gets its spacecraft out very far into the solar system is through the use of: a) nuclear fusion fuel, mainly the proton-proton reaction process to produce maximum thrust. b) by addition two more booster rockets to the normally one used for shuttle flights. c) gravitational assist by “flybys” of space craft near orbiting planets. d) by using iron supports in the spacecraft design so that the huge magnetic fields of the Jovian planets can “pull” the space crafts towards them. e) by gigantic solar wind panels that are deployed after the space craft leaves Earth’s orbit. Problem 6. At Saturn’s equinox, a) It is winter at its south pole. b) The purple feature on the north pole vanishes. c) Its rings completely shadow Saturn from the Sun. d) Its rings cast only a very thin shadow on its equator. e) Its north pole points directly at the Sun.
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3 Problem 7. Newsy Item from Lecture: What recent “heavenly object” appeared from earth to be larger than usual the weekend of March 19-20? a) The Sun. b) Ceres. c) Mars. d) The Moon. e) The Orion Nebula Problem 8. What is the approximate distance in planetary radii for an object of similar density to be ripped apart by the host planet? a) 1, since a moon must touch the planet’s surface to start disintegration. b)
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Exam2Spring2011KEY - EXAM#2 ASTRONOMY 1002 NAME_KEY...

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