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21 How much work is required to move a single electron through a potential difference
of 100. volts?
(1) 1.6 × 10–21 J
(2) 1.6 × 10–19 J
(3) 1.6 × 10–17 J
(4) 1.0 × 102 J
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22 An object can not have a charge of
(1) 3.2 × 10–19 C
(2) 4.5 × 10–19 C
(3) 8.0 × 10–19 C
(4) 9.6 × 10–19 C
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23 After electrons in hydrogen atoms are excited to the n = 3 energy state, how
many different frequencies of radiation can be emitted as the electrons return to
the ground state?
(1) 1
(2) 2
(3) 3
(4) 4
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24 What type of nuclear force holds the protons and neutrons in an atom together?
(1) a strong force that acts over a short range
(2) a strong force that acts over a long range
(3) a weak force that acts over a short range
(4) a weak force that acts over a long range
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25 Which is an acceptable unit for impulse?
(1) N•m
(2) J/s
(3) J•s
(4) kg•m/s
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26 The centers of two 15.0-kilogram spheres are separated by 3.00
meters. The magnitude of the gravitational force between the two spheres is approximately
(1) 1.11 × 10–10 N
(2) 3.34 × 10–10 N
(3) 1.67 × 10–9 N
(4) 5.00 × 10–9 N
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27 During a collision, an 84-kilogram driver of a car moving at 24 meters per second
is brought to rest by an inflating air bag in 1.2 seconds. The magnitude
of the force exerted on the driver by the air bag is approximately
(1) 7.0 × 101 N
(2) 8.2 × 102 N
(3) 1.7 × 103 N
(4) 2.0 × 103 N
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28 An apple weighing 1 newton on the surface of Earth has a mass of approximately
(1) 1 × 10–1 kg
(2) 1 × 100 kg
(3) 1 × 101 kg
(4) 1 × 102 kg
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29 In raising an object vertically at a constant speed of 2.0 meters per
second, 10. watts of power is developed. The weight of the object is
(1) 5.0 N
(2) 20. N
(3) 40. N
(4) 50. N
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30 Which diagram best represents magnetic flux lines around a bar magnet?
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31 In which situation is the net force on the object equal to zero?
(1) a satellite moving at constant speed around Earth in a circular orbit
(2) an automobile braking to a stop
(3) a bicycle moving at constant speed on a straight, level road
(4) a pitched baseball being hit by a bat
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Base your answers to questions 32 and 33 on the information below.
A 2.00 × 106-hertz radio signal is sent a distance of 7.30 ×
1010 meters from Earth to a spaceship orbiting Mars.
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32 Approximately how much time does it take the radio signal to travel from Earth
to the spaceship?
(1) 4.11 × 10–3 s
(2) 2.43 × 102 s
(3) 2.19 × 108 s
(4) 1.46 × 1017 s
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Note that question 33 has only three choices.
33 The spaceship is moving away from Earth when the radio signal is received. Compared
to the frequency of the signal sent from Earth, the frequency of the signal received
by the spaceship is
(1) lower
(2) higher
(3) the same
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34 What is the total resistance of the circuit segment shown in the diagram below?
(1) 1.0 Ω
(2) 9.0 Ω
(3) 3.0 Ω
(4) 27 Ω
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35 What is the approximate electrostatic force between two protons separated by
a distance of 1.0 × 10–6 meter?
(1) 2.3 × 10–16 N and repulsive
(2) 2.3 × 10–16 N and attractive
(3) 9.0 × 1021 N and repulsive
(4) 9.0 × 1021 N and attractive
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36 The diagram below shows a 4.0-kilogram cart moving to the right and a
6.0-kilogram cart moving to the left on a horizontal frictionless surface.
When the two carts collide they lock together. The magnitude of the total momentum
of the two-cart system after the collision is
(1) 0.0 kg•m/s
(2) 6.0 kg•m/s
(3) 15 kg•m/s
(4) 30. kg•m/s
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37 The diagram below shows a 10.0-kilogram mass held at rest on a frictionless
30.0° incline by force F.
What is the approximate magnitude of force F?
(1) 9.81 N
(2) 49.1 N
(3) 85.0 N
(4) 98.1 N
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38 An archer uses a bow to fire two similar arrows with the same string force. One
arrow is fired at an angle of 60.° with the horizontal, and the other is
fired at an angle of 45° with the horizontal. Compared to the arrow fired at 60.°,
the arrow fired at 45° has a
(1) longer flight time and longer horizontal range
(2) longer flight time and shorter horizontal range
(3) shorter flight time and longer horizontal range
(4) shorter flight time and shorter horizontal range
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39 The graph below shows the velocity of a race car moving along a straight line
as a function of time.
What is the magnitude of the displacement of the car from t = 2.0 seconds
to t = 4.0 seconds?
(1) 20. m
(2) 40. m
(3) 60. m
(4) 80. m
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40 Which vector diagram represents the greatest magnitude of displacement for an
object?
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