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# t2_09[1] - Brock University Number of pages 9 Number of...

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Brock University Test 2, November 2009 Number of pages: 9 Course: ASTR 1P01 Number of Students: 500 Date of Examination: November 12,2009 Number of hours: 50 min Time of Examination: 13:00–13:50 Instructor: B.Mitrovi´ c 1. Galileo’s observation of the gibbous and the quarter phases of Venus supported (a) the geocentric model. (b) the heliocentric model. 2. At the time of Copernicus, the fact that parallax shift of the brighter stars could NOT be seen was considered evidence for which model? (a) The geocentric model. (b) The heliocentric model. 3. According to Kepler’s second law, a planet moves fastest when it is (a) closest to the Sun. (b) at the greatest distance from the Sun. (c) [The speed of the planet does not depend on its distance from the Sun.] 4. Who was the Frst to observe the moons of Jupiter? (a) Kepler. (b) Galileo. (c) Brahe. (d) Aristarchus. 5. The Copernican model explained retrograde motion of planets as a result of (a) their motion along epicycles. (b) di±erence in speeds of the Earth and another planet in their orbits around the Sun. (c) planets stopping their eastward motion , moving westward awhile, and then resum- ing their eastward motion. (d) [None of the above.] 1

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Course: ASTR1F00 Date: November 12, 2009 page 2 of 9 pages 6. According to Newton’s laws of motion the acceleration of a body (a) is proportional to the net force acting on it and inversely proportional to its mass. (b) is proportional to its mass and inversely proportional to the net force acting on it. (c) is independent of its mass. (d) is proportional to the square of the net force acting on it. 7. Kepler’s Third Law states that (a) the ratio of the cube of a planet’s semimajor axis and the square of its orbital period is the same for all planets. (b) planets move in elliptical orbits. (c) a line connecting the Sun and a planet sweeps equal areas in equal times. (d) [None of the above.] 8. If the distance between two bodies is increased by a factor of 4 (four), the force of gravity which they exert on each other is (a) reduced by a factor of 16 (sixteen). (b) increased by a factor of 16 (sixteen).
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t2_09[1] - Brock University Number of pages 9 Number of...

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