Mastery Quiz (See related pages) 1 In the case of uniform circular motion A) the velocity of the object is constant B) the speed of the object is constant C) the net force on the object is zero D) the radius is continually changing 2 The centripetal force on an object in uniform circular motion A) is directed tangent to the circle B) points away from the center of the circle C) points toward the center of the circle 3 If the speed of an object in uniform circular motion is doubled while the radius remains constant the centripetal force is multiplied by a factor of A) 4 B) 2 C) 1 D) 0.5 E) 0.25 4 If the radius in which an object moves in uniform circular motion is doubled while the speed remains constant the centripetal force is multiplied by a factor of A) 4 B) 2 C) 1 D) 0.5 E) 0.25 5 The geocentric model of the universe that was widely accepted in scientific and religious circles until the 16th Century was that of A) Ptolemy B) Galileo C) Newton D) Copernicus 6 The heliocentric model of the universe was proposed in the 16th century by A) Ptolemy B) Galileo C) Newton D) Copernicus 7 According to Kepler's First Law, all planets have orbits about the Sun that are A) circles B) squares C) parabolas D) ellipses 8 According to Kepler's Second Law the radius vector drawn from the Sun to a planet A) is the same for all planets B) sweeps out equal areas in equal times C) sweeps out a larger area for a given time when the planet is moving faster D) sweeps out a larger area for a given time when the distance to the Sun is greater 9 The Law of Universal Gravitation was first formulated by A) Ptolemy B) Galileo C) Newton D) Copernicus 10 According to the Law of Universal Gravitation, when the distance between the centers of two objects is doubled and the masses remain constant the force between the objects is multiplied by a factor of A) 4 B) 2 C) 1 D) 0.5 E) 0.25
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