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Practice Exam 2 Fall

# Practice Exam 2 Fall - AST101 Section M001 Our Corner of...

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AST101 Section M001: Our Corner of the Universe Exam 2: October 14, 2010 Test Form A Answer all of the following questions on the bubble sheet provided using a #2 pencil. Make sure that your Name, Student ID Number and test form letter are on the answer sheet and that all answers are recorded in the correct position. ALWAYS SELECT THE BEST ANSWER. Each question is worth 1 point. This is a closed-book, closed-note exam and you have the duration of class to complete it. If you have questions, please raise your hand. You are not to talk to or attempt to obtain answers from other students for any reason. Be sure to bubble in your ID number and test form letter. DO NOT START THE EXAM UNTIL YOU ARE TOLD TO DO SO! 1

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Exam 2 Form A AST101.M001 Fall 2010 2 Choose the best answer from those provided. All questions are worth 1 point. 1. All of the following are steps in the scientific method except: (a) making observations. (b) proposing a model. (c) performing an experiment. (d) revising a model. (e) proving a model. 2. How many of the orbits shown below are physically realistic? Exam continues on next page
Exam 2 Form A AST101.M001 Fall 2010 3 Use the drawing below to answer the next two questions. The planets in the orbits shown obey Kepler’s laws. A B C 3. Which of the planets orbits is most like the Earth’s orbit around the Sun? 4. Which of the planets shown would experience the greatest change in speed over the course of an orbit? 5. Kepler’s third law states that the relationship between the orbital period and semi-major axis of a planet’s orbit is P 2 = a 3 . To use this equation for planets orbiting the Sun, P must be expressed in and a must be expressed in . The table below shows the orbital distances, orbital periods, and masses for the six planets closest to the Sun. Jupiter is the most massive of these planets at 318 times the mass of the Earth and Mercury is the least massive of these planets at 0.06 times the mass of the Earth. Planet Semi-major axis in A.U. Orbital Period in years Mass of Planet in units of the Earth’s mass Mercury 0.38 0.24 0.06 Venus 0.72 0.61 0.81 Earth 1.0 1.0 1.0 Mars 1.52 1.88 0.11 Jupiter 5.20 11.86 318 Saturn 9.54 29.46 95.2

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