Question: A large spring requires a force of 150 N to compress it only 0.010 m. What is the spring constant of the spring? (15 000 N/m)
Answer Options:
1 500 N/m
15 000 N/m
150 000 N/m
1 500 000 N/m
Answer: 15 000 N/m
Question: If it takes 4.0 N to stretch a spring 6.0 cm and if the spring is then cut in half, what force does it take to stretch one of the halves 3.0 cm? (4.0 N)
Answer Options:
2.0 N
3.0 N
4.0 N
5.0 N
Answer: 4.0 N
Question: A 0.20-kg object is oscillating on a spring with a spring constant of 𝑘=15N/mk=15 N/m. What is the potential energy of the system when the object displacement is 0.040 m, exactly half the maximum amplitude? (0.012 J)
Answer Options:
0.010 J
0.012 J
0.014 J
0.016 J
Answer: 0.012 J
Question: A 0.20 kg object, attached to a spring with spring constant 𝑘=10N/mk=10 N/m, is moving on a horizontal frictionless surface in simple harmonic motion of amplitude of 0.080 m. What is its speed at the instant when its displacement is 0.040 m? (57 cm/s)
Answer Options:
50 cm/s
55 cm/s
57 cm/s
60 cm/s
Answer: 57 cm/s
Question: If one could transport a simple pendulum of constant length from the Earth’s surface to the Moon’s, where the acceleration due to gravity is one-sixth (1/6) that on the Earth, by what factor would the pendulum frequency be changed? (about 0.41)
Answer Options:
0.31
0.41
0.51
0.61
Answer: about 0.41
Question: Which of the following ranges corresponds to the longest wavelengths, infrasonic, audible, or ultrasonic? (infrasonic)
Answer Options:
Infrasonic
Audible
Ultrasonic
Answer: Infrasonic
Question: The frequency separating audible waves and ultrasonic waves is considered to be 20 kHz. What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 340 m/s.) (1.7 cm)
Answer Options:
1.5 cm
1.7 cm
2.0 cm
2.5 cm
Answer: 1.7 cm
Question: The speed of sound at 0°C is 331 m/s. What is the speed of sound at 25°C? (0°C = 273 K) (346 m/s)
Answer Options:
340 m/s
343 m/s
346 m/s
350 m/s
Answer: 346 m/s
Question: The density of a certain metal solid is 7.2 x 10³ kg/m³, and its Young’s modulus is 10 x 10¹⁰ N/m². What is the speed of sound in this metal? (3 700 m/s)
Answer Options:
3 500 m/s
3 700 m/s
4 000 m/s
4 500 m/s
Answer: 3 700 m/s
Question: Tripling the power output from a speaker emitting a single frequency will result in what increase in loudness? (4.8 dB)
Answer Options:
3.0 dB
4.5 dB
4.8 dB
5.0 dB
Answer: 4.8 dB
Question: The intensity level of sound 20 m from a jet airliner is 120 dB. At what distance from the airplane will the sound intensity level be a tolerable 100 dB? Assume spherical spreading of sound. (200 m)
Answer Options:
150 m
180 m
200 m
220 m
Answer: 200 m
Question: You stand by the railroad tracks as a train passes by. You hear a 1 000-Hz frequency when the train approaches, which changes to 800 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s. (37.8 m/s)
Answer Options:
35.0 m/s
37.8 m/s
40.0 m/s
42.5 m/s
Answer: 37.8 m/s
Question: A plane is traveling at Mach 0.950 through air at a temperature of 0°C. What is the plane’s speed? Speed of sound at 0°C is 331 m/s. (314 m/s)
Answer Options:
300 m/s
314 m/s
320 m/s
330 m/s
Answer: 314 m/s
Question: Two loudspeakers are placed side by side and driven by the same source at 500 Hz. A listener is positioned in front of the two speakers and on the line separating them, thus creating a constructive interference at the listener’s ear. If one of the speakers is gradually pushed toward the listener, how far must it be moved to repeat the condition of constructive interference at the listener’s ear? The speed of sound = 340 m/s. (0.68 m)
Answer Options:
0.5 m
0.6 m
0.68 m
0.7 m
Answer: 0.68 m
Question: Doubling the tension in a guitar string will change its natural frequency by what factor? (1.4)
Answer Options:
1.2
1.3
1.4
1.5
Answer: 1.4