True/False (Value 5)
Indicate
whether the statement is true or false.
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1.
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A standing wave results from the interference of two waves of equal wavelength
that travel in opposite directions.
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2.
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When work is done on a spring to stretch it, elastic potential energy is stored
in the spring.
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3.
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When a mass suspended from a spring is in its equilibrium position, the upward
force exerted by the spring is equal to the downward force exerted by gravity acting on the
mass.
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4.
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The period of a simple harmonic oscillator is the time it takes for one complete
cycle of oscillation to be completed.
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5.
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Destructive interference between two superimposed waves can result in a node, or
point with no displacement.
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Multiple Choice (Value 5)
Identify the choice that best completes the statement or answers
the question.
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6.
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Tapping the surface of a pan of water generates 17.5 waves per second. If
the wavelength of each wave is 45 cm, what is the speed of the waves?
a. | 7.9 m/s | c. | 39 m/s | b. | 790 m/s | d. | 2.6 m/s |
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7.
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What is the period of a pendulum near Earth’s surface that is 130 cm
long?
a. | 2.3 s | c. | 22.9 s | b. | 0.83 s | d. | 9.1 s |
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8.
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If wavelength is kept constant, which increases as the speed of a wave
increases?
a. | period | c. | phase | b. | amplitude | d. | frequency |
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9.
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Which is not an example of resonance?
a. | a child swings higher as she is pushed on a swing | b. | a guitar string is
repeatedly plucked | c. | a car bumper bounces back after a
collision | d. | a basketball is dribbled down the court |
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10.
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In the diagram, the wavelength is shown by:
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Completion (Value 5)
Complete
each statement.
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11.
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Hooke’s Law states that the force exerted by a spring is
____________________ to the amount that the spring is stretched.
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12.
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Longitudinal waves vibrate ____________________ to the direction the wave
propagates.
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13.
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The ____________________ of a pendulum depends only on the acceleration
due to gravity and the length of the pendulum.
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14.
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Points on a wave that are an integer number of wavelengths apart from one
another are said to be ____________________.
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15.
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On a graph of force versus displacement of a spring, the
____________________ is given by the slope of the line.
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Short Answer (Value 4)
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16.
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What data are required to experimentally determine the value of k?
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17.
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Explain the meaning of the negative sign in the equation for Hooke’s
Law.
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Problem (Value 12)
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Displacement of a
Spring
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18.
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How much potential energy is stored in the spring if it is displaced 0.6
m?
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19.
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The displacement of a spring when different amounts of force are applied is
shown in this graph. What is the spring constant of this spring?
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20.
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A lifeguard on a beach observes that waves have a speed of 2.60 m/s and a
distance of 2.50 m between wave crests. What is the period of the wave motion?
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21.
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A spring has 54,000 J of elastic potential energy stored when it is stretched
out. If its spring constant is 285 N/m, how much has the spring been stretched?
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