# Quiz 2B

Ptolemy improved the geocentric model by …Group of answer choicesadding epicycles and deferentsadding crystalline spheresmoving the Sun to the centerchanging the circles to ellipsesQuestion 2What is the angular diameter (in arcseconds) of an object that has a linear diameter of 75 cm and a distance of 2 km?Question 3Which ancient astronomer measured the radius of the Earth?AristarchusEratosthenesAristotlePythagorasQuestion 4According to the small angle equation, if an object at a fixed distance is suddenly shrunk to a smaller size, then the angular size will …stay the samedecreasethere’s not enough information to say for sureincreaseQuestion 5Ptolemy’s improvements were important because they explained …lunar eclipsesretrograde motionsolar eclipsesthe motion of the Sun in the skyQuestion 6Copernicus’ heliocentric model was able to predict the location of the planets more accurately than Ptolemy’s geocentric model.TrueFalseQuestion 7If the Earth were flat, then the shadows of two towers at two different places on the Earth would …be different lengths with the one further South being longerbe different lengths with the one further East being longerbe different lengths with the one further North being longerbe the exact same lengthQuestion 8If it takes a planet 1.2 years to orbit the Sun, how long (in years) will it take the planet to go all the way around our sky once?Question 9One of the main objections to the heliocentric model was that …we do not feel the Earth movingit put some planets closer to the sun and Earth farther awayit was more complex than the geocentric modelit did not explain retrograde motionQuestion 101 ptsCopernicus was the first to be able to prove that the Earth orbited around the Sun.TrueFalseQuestion 11In Ptolemy’s model, it is possible to have a planetary orbit without retrograde motion.TrueFalseQuestion 12If it takes a planet 5 years to orbit the Sun, how long (in years) will it take the planet to go all the way around our sky once?Question 13What is the angular diameter (in arcseconds) of an object that has a linear diameter of 5 meters and a distance of 3 km?Question 14What is the linear diameter (in meters) of an object that has an angular diameter of 22 arcseconds and a distance of 1,400 m?Question 15What is the linear diameter (in meters) of an object that has an angular diameter of 110 arcseconds and a distance of 25,000 m?

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