Physics Principles and Problems 2009

Chapter 14: Vibrations and Waves

Standardized Test Practice

1
A spring stretches 14 cm when an object weighing 28 N is hung from it. What is the spring constant?
  Need a Hint?
A)1.4 N/cm
B)1.8 N/cm
C)2.0 N/cm
D)14 N/cm
2
If the period of a pendulum is 1.2 s, what is the length of the pendulum?
  Need a Hint?
A)1.3 m
B)1.0 m
C)0.75 m
D)0.39 m
3
A longitudinal wave with a wavelength of 0.50 m has a period of 0.20 s. How far does the wave travel in 45 s?
A)6.8×101 m
B)1.1×102 m
C)1.4×102 m
D)1.7×102 m
4
The illustration shows a spring stretched by the weight of a block. If the block weights 34 N, what potential energy is stored in the spring?

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  Need a Hint?
A)2.0 J
B)2.8 J
C)3.5 J
D)4.1 J
5
If the block were replaced with one that weighs 52 N, what would be the displacement?

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A)17 cm
B)18 cm
C)21 cm
D)23 cm
6
A wave reflects off a wall. Which of the following is true of the reflected wave?
A)The reflected wave has about the same amplitude as the incident wave and is inverted.
B)The reflected wave has a significantly smaller amplitude than the incident wave and is inverted.
C)The reflected wave has a greater amplitude than the incident wave and is upright.
D)The reflected wave has about the same amplitude as the incident wave and is upright.
7
__________ occurs when small forces are applied at regular intervals to a vibrating or oscillating object and the amplitude of the vibration increases.
A)A pendulum
B)Resonance
C)Large displacement
D)Harmonic convergence
8
Echoes are caused by the __________ of sound waves off hard surfaces.
A)superposition
B)resonance
C)refraction
D)reflection
9
The diagram shows the superposition of two waves.

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Which of the following is true about the waves shown in the diagram?
A)equal amplitudes, constructive interference
B)equal amplitudes, destructive interference
C)different amplitudes, constructive interference
D)different amplitudes, destructive interference
10
The gravitational field strength on the surface of Mars is 3.7 N/kg. A simple pendulum on the surface of Mars has a period of 1.5 s. What is the length of the pendulum?
A)0.56 m
B)0.21 m
C)0.057 m
D)0.14 m
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