Question 1 An object moving in a circle at constant speed is accelerated Question 2 A bullet is fired upward. As it rises, Question 3 The radius of the path of an object moving in a circle at constant speed is halved. If the speed remains the same, the centripetal force needed is Question 4 If the moon were half as far from the earth as it is now, the gravitational force it exerts on the earth would be Question 5 Relative to what she weighs on the earth, an astronaut visiting another planet Question 6 A moose weighing 3 kN is standing still. The force the ground exerts on the moose is Question 7 A snail travels 45 cm in 20 min. Its average speed is Question 8 Which of the following units could be associated with a vector quantity? Question 9 Of the following, a molecule is best described as Question 10 The properties of several different materials are being compared. If the samples all have the same volume, the one with the greatest mass also has the greatest Question 11 Which of the following is not true of molecular motion in a gas? Question 12 The circulation of hot air in a room is an example of transfer of heat by Question 13 When heat is added to a body of matter, the resulting temperature increase does not depend upon Question 14 The pressure at the bottom of a barrel filled with liquid does not depend on the Question 15 The temperature of a gas sample in a rigid container is reduced. The pressure the gas exerts on the container walls decreases because Question 16 Ice floats in water because Question 17 The concept that gravitation is a distortion of space-time is part of Question 18 Which of the following quantities is always the same to all observers? Question 19 The angular momentum of spinning object depends, in part, on its mass and how fast it is spinning. Consider the following situation: a skater spins slowly on one skate, with her arms and the other leg extended. As she pulls in her arms and extended leg, she spins faster. This is because Question 20 The linear momentum of a 400-kg giraffe galloping at 5 m/s is Question 21 An object that has linear momentum must also have Question 22 The watt is a unit of Question 23 What never changes when two or more objects collide is Question 24 On a molecular level heat is Question 25 The current with which a transformer is used Question 26 Coulombs formula F = KQ1Q2/R2 gives the force between two charges in free space. The value of K Question 27 Which of the following statements is not true? Question 28 A negative electric charge Question 29 An object has a positive electric charge whenever Question 30 A drawing of the field lines of a magnetic field provides information on Question 31 The relationship between voltage, current, and resistance in a metallic wire: Question 32 When an observer moves past a stationary electric charge, she detects Question 33 When first proposed, a scientific idea is usually called a Question 34 The period of the earths orbit around the sun is Question 35 If the earth had no moon, Question 36 Stars and planets are round because Question 37 The scientist who showed that gravity accounts for Keplers laws of planetary motion was Question 38 What distinguishes the scientific method from other ways of looking at the natural world is Question 39 Scientific theories Question 40 In which one or more of the following is the earth assumed to be the center of the universe?
