2. 1. A ball is thrown into the air. At the ball’s maximum altitude where its velocity is zero, its acceleration is A. zero B. changing from upward to downward C. changing from downward to upward D. directed upward E. directed downward

3. 2. In which part of the graph is the object’s velocity zero? a. AB b. BC c. CD d. DE e. Two are correct.

4. 3. The average velocity of the object from t = 0 s to t = 2 s is a. 0 m/s b. 2 m/s c. 5 m/s d. 10 m/s e. 20 m/s

5. 4. The displacement of the object from t = 2 s to t = 6 s is a. - 40 m b. - 10 m c. 10 m d. 40 m e. 70 m

6. 5. A boat accelerates from 23 m/s to 5.0 m/s in 13.4 s. What is its acceleration?

7. 6. An automobile with an initial velocity of 25 m/s accelerates uniformly at -2.25 m/s 2. What is its final velocity after 4.0 s?

8. 7. By dragging his toe, a roller skater can slow from 16 m/s to rest in 2.5 s. How many meters away from a wall must the roller skater start dragging his toe in order to stop before hitting the wall?

9. 8. A car accelerates from rest at a rate of 2.3 m/s 2. What is its velocity after traveling 25 m?

10. 9. A cat falls off a ledge that’s 3.0 m tall. How long will it take to hit the ground?

11. 10. A ball is thrown straight up with a speed of 22 m/s. What is the maximum height the ball reaches?

12. 11. What is the weight of a 108-kg football player?

13. 12. As a ball falls, the action force is the pull of the Earth on the ball. What is the reaction to this force? A. The pull of the ball on the Earth B. Air resistance acting against the ball C. The acceleration of the ball D. Nonexistent in this case E. none of the above

14. 13. A 75-kg astronaut weighs 285 N on the surface of Mars. What is the acceleration of gravity on Mars?

15. 14. After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals A. zero, since no force is necessary to keep it moving. B. twice the force with which it was fired. C. one half the force with which it was fired. D. the same amount of force with which it was fired. E. one quarter the force with which it was fired.

16. 15. A 15-N force and a 32-N force act on an object toward the right. A 18-N force acts on the same object toward the left. What is the magnitude and direction of the net force on the object?

17. 16. Betty uses a pulley and a rope to pull a bucket up out of a well. The bucket has a mass of 6.0 kg accelerates upward at 1.5 m/s 2. With what force does Betty pull on the rope?

18. 17. A rock is kicked horizontally at a speed of 10 m/s from the edge of a cliff. The rock strikes the ground 55 m from the foot of the cliff of height H as suggested in the figure. Neglect air resistance. a. How long is the rock in the air? b. What is the approximate value of H, the height of the cliff?

19. 18. After walking 11 km due north from camp, a hiker then walks 21 km due east. Determine the total displacement from the starting point. Give magnitude and direction.

20. 19. A hummingbird flies at 17 m/s at an angle of 21° to the horizontal, as shown above. What are the x and y components of its velocity? 21° 17 m/s

21. 20. A soccer ball is kicked with an initial speed of 18.6 m/s reaches a maximum height of 14.9 m. At what angle was the ball kicked?

22. 21.Two point masses m and M are separated by a distance d. If the distance between the masses is increased to 3d, how does the gravitational force between them change? a. The force will be one-third as great. b. The force will be one-ninth as great. c. The force will be three times as great. d. The force will be nine times as great. e. It is impossible to determine without knowing the numerical values of m, M, and d.

23. 22. The earth exerts the necessary centripetal force on an orbiting satellite to keep it moving in a circle at constant speed. Which statement best explains why the speed of the satellite does not change even though there is a net force exerted on it? a. The satellite is in equilibrium. b. The acceleration of the satellite is 0 m/s 2. c. The centripetal force has magnitude mv 2 /r. d. The centripetal force is canceled by the reaction force. e. The centripetal force is always perpendicular to the velocity.

24. 23.A racecar is traveling at constant speed around a circular track. What happens to the centripetal acceleration of the car if the speed is doubled? a. It remains the same. b. It increases by a factor of 2. c. It increases by a factor of 4. d. It is decreased by a factor of one-half. e. It is decreased by a factor of one-fourth.

25. 24. The mass of the planet Mars is 6.4 x 10 23 kg and its average distance from the sun is 2.3 x 10 11 meters. The sun has a mass of 2.0 x 10 30 kg. What is the magnitude of the force of gravitational attraction between the sun and Mars?

26. 25. A 1680-kg car moving at 23 m/s strikes a 2005-kg car at rest. If the two cars stick together, with what speed do they move after the collision?

27. 26. The driver of a 2,500-kg SUV is traveling at 29 m/s while texting on her phone. She looks up to find she is headed straight for a cornfield. If the force of friction between the corn and the SUV is 1,300 N, how long does it take her to stop? (Ignore other sources of friction.)

28. 27. As a pendulum swings back and forth a. kinetic energy is transformed into potential energy. b. at the end points of its swing, its energy is all potential. c. potential energy is transformed into kinetic energy. d. at the lowest part of its swing, its energy is all kinetic. e. all of the above

29. 28. A bullet traveling at 710 m/s has 1880 J of kinetic energy. What is its mass?

30. 29. 3400 J of heat is added to 2.9 kg of lead. What is its change in temperature? (The specific heat capacity of lead is 128 J/kg·°C.)

31. 30. A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current A. points directly away from you. B. points to the left. C. circles the wire in a clockwise direction. D. circles the wire in a counter-clockwise direction.

32. 31. If an object is vibrating with a frequency of 25 Hz, what is its period of vibration? a. 25 s b. 0.25 s c. 0.040 s d. 40 s e. None

33. 32. When two or more waves are at the same place at the same time, the resulting effect is called a. a Doppler wave. b. a shock wave. c. interference. d. a period.

34. 33. Brianna is standing still and listening to a siren. She begins running toward the sound. The frequency of the sound she hears will a. increase. b. decrease. c. remain the same.

35. 34. What is the frequency of a sound wave with a speed of 343 m/s and a wavelength of 3.00 m?

36. 35. What is the angle of incidence on an air-to-glass boundary if the angle of refraction in the glass (n = 1.58) is 22 o ?

37. 36. To reduce the amount of energy lost as heat in power lines, electric energy is transmitted from power plants to consumers A. as alternating current at low voltage. B. as alternating current at high voltage. C. as direct current at low voltage. D. as direct current at high voltage.

38. 37. A wire lying in the plane of the page carries a current toward the bottom of the page. What is direction of the magnetic force it produces on an electron that is moving perpendicularly toward the wire, also in the plane of the page, from your right? A. Zero B. Perpendicular to the page and towards you C. Perpendicular to the page and away from you D. Toward the top of the page E. Toward the bottom of the page

39. 38. A repelling force must occur between two charged objects under which of the following conditions? A. charges are of unlike signs B. charges are of like signs C. charges are of equal magnitude D. charges are of unequal magnitude

40. 39. In a thundercloud there is an electric charge of +40 C near the top of the cloud and -40 C near the bottom of the cloud. These charges are separated by 2.0 km. What is the electric force between these two sets of charges?

41. 40. A negatively charged rod is brought near one end of an uncharged metal bar that is supported by an insulator. The end of the metal bar farthest from the charged rod will be which of the following? A. positive B. negative C. neutral D. attracted

42. 41. A wire carries a steady current of 0.1 A over a period of 20 s. What total charge passes through the wire in this time interval?

43. 42. Complete the following statement: When a glass rod is rubbed with silk cloth, the rod becomes positively charged as A. positive charges are transferred from the rod to the silk. B. positive charges are created on the surface of the rod. C. negative charges are transferred from the silk to the rod. D. negative charges are transferred from the rod to the silk. E. positive charges are transferred from the silk to the rod.

44. 43. What charge exists on a test charge that experiences a force of 2.6 x 10 -5 N at a point where the electric field intensity is 550 N/C?

45. 44. If the size of the charge value is tripled for both of two point charges maintained at a constant separation, the mutual force between them will be changed by what factor? A. 9.0 B. 3.0 C. 0.33 D. 1/9

46. 45. The electric potential at a certain point is space is 12 V. What is the electric potential energy of a -3.0 C charge placed at that point?

47. 46. By using only two resistors, R1 and R2, a student is able to obtain resistances of 3 Ω, 4 Ω, 12 Ω, and 16 Ω. The values of R1 and R2 (in ohms) are: A. 3, 4 B. 2, 12 C. 3, 16 D. 4, 12 E. 4, 16

48. 47. If a 100 W light bulb operates at a voltage of 120 V, what is the resistance of the bulb?

49. 48. A battery is connected across a parallel combination of two identical resistors. If the potential difference across the terminals is V and the current in the battery is I, then: A. the potential difference across each resistor is V and the current in each resistor is I B. the potential difference across each resistor is V/2 and the current in each resistor is I/2 C. he potential difference across each resistor is V and the current in each resistor is I/2 D. the potential difference across each resistor is V/2 and the current in each resistor is I E. none of the above are true

50. 49. What is the potential difference across a 5-Ω resistor that carries a current of 5 A?

51. 50.Three resistors having values of 4.0, 6.0 and 10.0 , are connected in parallel. What is their equivalent resistance?

52. 51. Three resistors having values of 4.0, 6.0 and 8.0 Ω, are connected in series with a 6.0-V battery. What is the voltage across the 6.0-Ω resistor?

53. 52. A wire 0.15 m long wire carrying a current of 10 A is at right angles to a uniform magnetic field. The force on the wire is 0.60 N. What is the strength of the magnetic field it is in?

54. 53. An iron rod becomes magnetic when A. positive charges line up on one side and negative charges on the other side. B. positive ions gather at one end and negative ions at the other end. C. its electrons stop moving and point in the same direction. D. the net spins of its electrons point in the same direction. E. none of the above

55. 54. Which of Earth’s geographic poles is nearest its magnetic north pole? A. South Pole B. North Pole C. both A and B

56. 55. Which one of the following statements concerning the magnetic force on a charged particle in a magnetic field is true? A. It is a maximum if the particle is stationary. B. It is zero if the particle moves perpendicular to the field. C. It is a maximum if the particle moves parallel to the field. D. It acts in the direction of motion for a positively charged particle. E. It depends on the component of the particle's velocity that is perpendicular to the field.

57. 56. A charged particle is moving in a uniform, constant magnetic field. Which one of the following statements concerning the magnetic force exerted on the particle is false? A. It does no work on the particle. B. It increases the speed of the particle. C. It changes the velocity of the particle. D. It can act only on a particle in motion. E. It does not change the kinetic energy of the particle.

58. 57. An electron traveling due north enters a region that contains a uniform magnetic field that points due east. In which direction will the electron be deflected? A. east B. west C. down D. up E. south

59. 58. An electron enters a region that contains a magnetic field directed into the page as shown. The velocity vector of the electron makes an angle of 30° with the +y axis. What is the direction of the magnetic force on the electron when it enters the field? A. up, out of the page B. at an angle of 30° below the positive x axis C. at an angle of 30° above the positive x axis D. at an angle of 60° below the positive x axis E. at an angle of 60° above the positive x axis

60. 59. A 16 T magnetic field acts in a direction due west. An electron is traveling due south at 8.1 x 10 5 m/s. What is the magnitude and direction of the force acting on the electron?

61. 60. Changing the magnetic field intensity in a closed loop of wires induces A. current. B. voltage. C. both current and voltage. D. neither current nor voltage.

62. 61. A magnet is moved in and out of a coil of wire connected to several lamps. If the number of coils is doubled A. it is easier to move the magnet. B. there is no difference in moving the magnet. C. it is harder to move the magnet.

63. 62. The principal reason voltage is induced in the loops of a generator coil is that the A. loops are rotating, changing the amount of magnetic field within the loops. B. size of the loops is changing. C. magnet's strength is changing. D. magnet is rotating. E. all of the above

64. 63. If the primary coil of a transformer were connected to a DC power source, the transformer would operate A. the same as always. B. at very low efficiency. C. only while being connected or disconnected. D. only if the output were also DC voltage. E. none of the above

65. 64. The voltage across a transformer primary coil that has 50 turns is 25 V. What is the voltage across the secondary coil, which has 20 turns? A. 2 V B. 10 V C. 20 V D. 40 V E. 50 V

66. 65. The time needed for a wave to make one complete cycle. What’s the word?

67. 66. The distance between successive identical parts of a wave. What’s the word?

68. 67. A unit of frequency equal to one cycle per second. What’s the word?

69. 68. A man is standing on the shore of a beach, up to his knees in water. Every 2 seconds a wave breaks on him. What is the period of the wave?

70. 69. A man is standing on the shore of a beach, up to his knees in water. Every 2 seconds a wave breaks on him. What is the frequency of the wave?

71. 70. A wave created by shaking a rope up and down is called a A. transverse wave. B. Doppler wave. C. standing wave. D. longitudinal wave. E. constructive wave.

72. 71. Where can you touch a standing wave on a rope without disturbing the wave? A. At a node B. At any place along the wave C. At an antinode

73. 72. Sound waves are A. transverse waves. B. longitudinal waves. C. circular waves. D. polarized waves.

74. 73. When two or more waves are at the same place at the same time, the resulting effect is called A. a Doppler wave. B. a shock wave. C. a period. D. interference.

75. 74. A wave that appears to stay in one place, caused by the superposition of identical waves that travel in opposite directions. What’s the word?

76. 75. Two wave pulses, each of wavelength, are traveling toward each other along a rope as shown above. When both pulses are in the region between points X and Y. which are a distance apart, the shape of the rope will be which of the following?

77. 76. A standing wave on a string takes the form shown above. The string is 5 m long. The speed on waves in the string is 1,000 m/s What is the frequency of the standing wave? What is the lowest possible frequency possible for this string?

78. 77. Water waves A. transport water but not energy. B. transport energy but not water. C. transport energy and water. D. are not mechanical waves.

79. 78. When the frequency of forced vibrations on an object matches the object’s natural frequency, and a dramatic increase in amplitude occurs. What’s the word?

80. 79. When a sound source moves towards you, what happens to the wave speed? A. It stays the same. B. It decreases. C. It increases.

81. 80. Brianna is standing still and listening to a siren sounding an alarm. She begins running toward the sound. The frequency of the sound she hears will A. increase. B. remain the same. C. decrease.

82. 81. A sound wave that has a higher frequency has a wavelength that is A. longer. B. shorter.

83. 82. Sound waves in air are a series of A. high- and low-pressure regions. B. periodic disturbances. C. periodic compressions and rarefactions. D. all of the above E. none of the above

84. 83. Sound waves A. can travel in a vacuum. B. require a medium. C. are not mechanical waves. D. are unrelated to vibrations.

85. 84. The frequency of a sound wave determines A. how fast the sound travels. B. the magnitude of the compression. C. the pitch of the sound. D. how loud the sound is.

86. 85. Constructive interference occurs when A. two waves of the same color overlap. B. the crests of two waves overlap. C. the crest of one wave meets the trough of another wave. D. all of the above E. none of the above

87. 86. The intensity of a sound depends on A. the medium. B. the amplitude of the waves. C. the wavelength of the sound. D. the pitch of the sound.

88. 87. The speed of a sound wave is determined by the A. source of the wave. B. medium of the wave. C. frequency of the wave. D. amplitude of the wave.

89. 88. Noise-canceling earphones are an example of A. beats. B. resonance. C. destructive interference. D. constructive interference.

90. 89. What is the speed of a wave that is 0.5 m long and has a frequency of 658 Hz?

91. 90. A sound wave has a wavelength of 8 m. If its speed is 340 m/s, what is its frequency?

92. 91. There are seven major categories of electromagnetic radiation: X-rays visible light radio waves infrared gamma rays ultraviolet Microwaves List them in order of increasing wavelength.

93. 92. An object is placed near a plane mirror, as shown above. Which of the labeled points is the position of the image?

94. 93. Which ray is the incident ray? A and B are perpendicular to each other. What is the angle of reflection? What is the angle of incidence? A B

95. 94. Which of the following best describes the image formed by a flat mirror? A. virtual, inverted and magnification greater than one B. real, inverted and magnification less than one C. real, upright and magnification equal to one D. virtual, upright and magnification equal to one

96. 95. An object is 12 cm in front of a concave mirror with a 20-cm focal length. The height of the object is 4 cm. a. What is the distance from the image to the mirror? b. Is the image in front of the mirror or behind the mirror? c. Is the image real or virtual? d. Is the image upright or inverted? e. What is the height of the image?

97. 96. The figure above shows a ray of light incident on the surface between substance A and substance B. In which substance does light travel slower?

98. 97. A light ray in air is incident on an air-to-glass boundary at an angle of 41 o with the normal and is refracted in the glass at an angle of 25 o with the normal. What is the index of refraction of the glass?

99. A mass on a compressed spring stores 5 J of potential energy. The spring is released, causing the mass to leave the spring and travel straight upward. What is the mass’s gravitational potential energy at the peak of its flight? (Ignore air resistance.) A. Greater than 5 J B. Less than 5 J C. Equal to 5 J

100. When a 4-N weight is hung from a spring, the spring stretches 0.03 m. How much does the spring stretch when an 8-N weight is hung from it? A. 0.02 m B. 0.03 m C. 0.12 m D. 0.06 m E. 0.24 m