 June 1997, Part 4
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61. A baseball player throws a baseball at a speed of 40. meters per second at an angle of 30. degrees to the ground. The horizontal component of the baseball's speed is approximately
1. 15 m/s
2. 20. m/s
3. 30. m/s
4. 35 m/s
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62. Projectiles are fired from different angles with the same initial speed of 14 meters per second. The graph below shows the range of the projectiles as a function of the original angle of inclination to the ground, neglecting air resistance. The graph shows that the range of the projectiles is

1. the same for all angles
2. the same for angles of 20. and 80. degrees
3. greatest for an angle of 45 degrees
4. greatest for a angle of 90. degrees
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63. The data table below gives the mean radius of orbit (R) and the period (T) of some planets orbiting the Sun. Which ratio is constant for these planets?

1. R/T
2. R2/T
3. R2/T2
4. R3/T2
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64. Four different balls are thrown horizontally off the top of four cliffs. In which diagram below does the ball have the shortest time of flight? 1 2 3 4
65. The diagram below represents the path of a planet in an elliptical orbit around the Sun. As the planet moves from point A to point B, what changes occur in its speed and kinetic energy?

1. Both speed and kinetic energy decrease
2. Both speed and kinetic energy increase
3. Speed decreases and kinetic energy increases
4. Speed increases and kinetic energy decreases 1 2 3 4
66. What is the boiling point of water at standard pressure on the Kelvin scale?
1. 100. K
2. 212 K
3. 273 K
4. 373 K
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67. Two solid metal blocks are placed in an insulated container. If there is a net flow of heat between the blocks, they must have different
1. initial temperatures
2. melting points
3. specific heats
4. heats of fusion
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68. Samples of lead, platinum, silver, and tungsten each have a mass of 1.0 kilogram and an initial temperature of 20. degrees Celsius. If 10. kilojoules of heat is added to each sample, which sample will experience the smallest increase in temperature?
1. lead, because it has the lowest heat of fusion
2. platinum, because it has the lowest heat of vaporization
3. silver, because it has the highest specific heat
4. tungsten, because it has the highest melting point
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69. When Juliann drinks cold water, her body warms the water until thermal equilibrium is reached. If she drinks 6 glasses (2.5 kilograms) of water at 0 degrees Celsius in a day, approximately how much energy must her body expend to raise the temperature of this water to her body's temperature of 37 degrees Celsius?
1. 190 kJ
2. 390 kJ
3. 840 kJ
4. 2300 kJ
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70. Which statement is consistent with the kinetic theory of ideal gases?
1. Molecules are always stationary.
2. The force of attraction between molecules is large.
3. Molecules transfer energy through collisions.
4. The size of molecules is large compared to the distance that separates them.
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71. The graph below shows the temperature versus time for 1.0 kilogram of unknown material as heat is added at a constant rate. During interval xy , the material experiences

1. a decrease in internal energy and a phase change
2. an increase in internal energy and a phase change
3. no change in internal energy and a phase change
4. no change in internal energy and no phase change
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72. Which graph best represents the relationship between volume (V) and absolute temperature (T size="-2">k) for a fixed mass of an ideal gas at constant pressure? 1 2 3 4
73. How much heat must be removed from 0.50 kilogram of mercury at -39 degrees Celsius to change it from a liquid to a solid?
1. 1.1 kJ
2. 5.5 kJ
3. 150 kJ
4. 180 kJ
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74. Which phase change represents a decrease in entropy?
1. solid to gas
2. solid to liquid
3. gas to liquid
4. liquid to gas
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Note that question 75 has only three choices.

75. In an operating automobile, the pressure on the coolant in the radiator is greater than 1.0 atmosphere and its temperature is above 100. degrees Celsius. If the radiator's pressure cap is removed, the pressure of the coolant is lowered to 1.0 atmosphere, causing the boiling point of the coolant to

1. decrease
2. increase
3. remain the same 1 2 3 4
76. A high resistance is connected in series with the internal coil of a galvanometer to make
1. a motor
2. an ammeter
3. a voltmeter
4. a generator
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77. A student uses a voltmeter to measure the potential difference across a circuit resistor. To obtain a correct reading, the student must connect the voltmeter
1. in parallel with the circuit resistor
2. in series with the circuit resistor
3. before connecting the other circuit components
4. after connecting the other circuit components

Base your answers to questions 78 and 79 on the diagram below which represents an electron moving with speed v to the right and about to enter a uniform magnetic field acting into the page. 1 2 3 4
78. Upon entering the magnetic field, the electron will be deflected
1. into the page
2. out of the page
3. toward the top of the page
4. toward the bottom of the page
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79. If the speed of the electron is 3.0 x 103 meters per second and the magnitude of the magnetic field is 3.0 x 10-5 tesla, the magnitude of the magnetic force on the electron is approximately
1. 4.8 x 10-24 N
2. 1.4 x 10-20 N
3. 4.8 x 10-16 N
4. 9.0 x 10-2 N
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80. In a transformer, two coils of wire are wound around a common iron core. To operate properly, the transformer requires
1. an alternating-current source connected to the primary coil
2. a direct-current source connected to the secondary coil
3. more turns in the primary coil than in the secondary coil
4. more turns in the secondary coil than in the primary coil Additional Tests
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