
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
 15 m/s
 20. m/s
 30. m/s
 35 m/s


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
 the same for all angles
 the same for angles of 20. and 80. degrees
 greatest for an angle of 45 degrees
 greatest for a angle of 90. degrees


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?
 R/T
 R^{2}/T
 R^{2}/T^{2}
 R^{3}/T^{2}


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?


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?
 Both speed and kinetic energy decrease
 Both speed and kinetic energy increase
 Speed decreases and kinetic energy increases
 Speed increases and kinetic energy decreases



66. What is the boiling point of water at standard pressure on the Kelvin scale?
 100. K
 212 K
 273 K
 373 K


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
 initial temperatures
 melting points
 specific heats
 heats of fusion


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?
 lead, because it has the lowest heat of fusion
 platinum, because it has the lowest heat of vaporization
 silver, because it has the highest specific heat
 tungsten, because it has the highest melting point


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?
 190 kJ
 390 kJ
 840 kJ
 2300 kJ


70. Which statement is consistent with the kinetic theory of ideal gases?
 Molecules are always stationary.
 The force of attraction between molecules is large.
 Molecules transfer energy through collisions.
 The size of molecules is large compared to the distance that separates them.


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
 a decrease in internal energy and a phase change
 an increase in internal energy and a phase change
 no change in internal energy and a phase change
 no change in internal energy and no phase change


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?


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 kJ
 5.5 kJ
 150 kJ
 180 kJ


74. Which phase change represents a decrease in entropy?
 solid to gas
 solid to liquid
 gas to liquid
 liquid to gas


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
 decrease
 increase
 remain the same



76. A high resistance is connected in series with the internal coil of a galvanometer
to make
 a motor
 an ammeter
 a voltmeter
 a generator


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
 in parallel with the circuit resistor
 in series with the circuit resistor
 before connecting the other circuit components
 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.


78. Upon entering the magnetic field, the electron will be deflected
 into the page
 out of the page
 toward the top of the page
 toward the bottom of the page


79. If the speed of the electron is 3.0 x 10^{3} 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
 4.8 x 10^{24} N
 1.4 x 10^{20} N
 4.8 x 10^{16} N
 9.0 x 10^{2} N


80. In a transformer, two coils of wire are wound around a common iron core. To
operate properly, the transformer requires
 an alternatingcurrent source connected to the primary coil
 a directcurrent source connected to the secondary coil
 more turns in the primary coil than in the secondary coil
 more turns in the secondary coil than in the primary coil
