PracticeExam2

PracticeExam2 - Practice Exam 2 AST101 Fall 2011 1 Choose...

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Practice Exam 2 AST101 Fall 2011 1 Choose the best answer from those provided. All questions are worth 1 point. 1. 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 . (a) perihelions; aphelions. (b) days; kilometers. (c) years; kilometers. (d) days; astronomical units. (e) years; astronomical units. 2. Which of the following best describes the normal (prograde) motion of the planets? (a) Planets rise in the west and set in the east. Over the course of several months, they appear to drift from east to west with respect to the distant stars. (b) Planets rise in the east and set in the west. Over the course of several months, they appear to drift from east to west with respect to the distant stars. (c) Planets rise in the west and set in the east. Over the course of several months, they appear to drift from west to east with respect to the distant stars. (d) Planets rise in the east and set in the west. Over the course of several months, they appear to drift from west to east with respect to the distant stars. 3. Mars rises tonight at the exact same time as a particular star. If Mars is in retrograde motion, then tomorrow night Mars will (a) rise earlier than this star. (b) rise at the same time as this star. (c) rise later than this star. 4. The concept of the epicycle was used to explain: (a) retrograde motion of the planets using the geocentric theory. (b) retrograde motion of the planets using the heliocentric theory. (c) why the Earth’s north pole points towards Polaris. (d) the changing of the seasons. (e) none of the above. 5. You observe two stars over the course of a year (or more) and find that: Star A has a parallax angle of 1 arcsecond Star B has a parallax angle of 1/2 arcseconds How do the distances to the stars compare? (a) Star A is further away than star B.
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PracticeExam2 - Practice Exam 2 AST101 Fall 2011 1 Choose...

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