Physics 011

A of PQ#11A

Chapter 11 : Vibrations and Waves
Practice Questions

 1. The unit for the spring constant is  The correct answer: N/m Review Section 11-1 in Giancoli. 2. The unit for the period is Your answer: s 3. The unit for frequency is  The correct answer: Hz Review Section 11-1 in Giancoli. 4. The unit for wavelength is  The correct answer: m Review Section 11-7 in Giancoli. 5. The unit for the product of wavelength and frequency is  The correct answer: m/s Review Section 11-7 in Giancoli. 6. The amplitude of the wave in the figure is  The correct answer: 4 m Review Figure 11-23 in Giancoli. 7. The wavelength is  The correct answer: Cannot be determined from the given information. The figure only shows the temporal (time) behavior of the wave. Review Section 11-7 in Giancoli. 8. The frequency of the wave is Your answer: .5 Hz 9. A stretched spring, fixed at both ends, vibrates at a frequency of 12 Hz with a standing transverse wave pattern as shown. What is this spring's fundamental frequency?  The correct answer: 4 Hz. You should have divided by 3. Review Section 11-11 in Giancoli. 10. A stretched spring, fixed at both ends, vibrates at a frequency of 12 Hz with a standing transverse wave pattern as shown. What would be the frequency of the first overtone? Your answer: 8 Hz 11. A stretched spring, fixed at both ends, vibrates at a frequency of 12 Hz with a standing transverse wave pattern as shown. If the string is 5 meters long, what is the wave velocity?  The correct answer: 40 m/s Review Section 11-11 in Giancoli. 12. If a string has a wave speed of 200 m/s and a mass per length ratio of 1.2 g/m, what is the tension?  The correct answer: 48 N Convert grams to kilograms. Review Section 11-11 in Giancoli. 13. A stretched cord has a fundamental frequency of 144 Hz, a length of .9 m, and a mass of 2 g. What is its wave speed? Your answer: 259 m/s 14. A stretched cord has a fundamental frequency of 144 Hz, a length of .9 m, and a mass of 2 g. What is the tension on the cord?  The correct answer: 149 N Review Example 11-13 in Giancoli. 15. The animation shows the Tacoma Narrows Bridge (see Online Destinations) shortly before its collapse. What is its frequency?  The correct answer: .50 Hz Measure the time for the car to make one complete vibration. Review Section 11-12 in Giancoli. 16. The animation shows the Tacoma Narrows Bridge (see Online Destinations) shortly before its collapse. The distance between the bridge towers (nodes) was about 860 meters and there was also a midway node. What was the wavelength of the standing torsional wave?  The correct answer: 860 m Review Section 11-12 in Giancoli. 17. The animation shows the Tacoma Narrows Bridge (see Online Destinations) shortly before its collapse. What is the amplitude?  The correct answer: 4 m Compare it to the size of the car. Review Section 11-12 in Giancoli. 18. The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also. What is the wavelength of the black wave?  The correct answer: 4 cm Measure the wavelength from peak to peak. Review Section 11-7 in Giancoli. 19. The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also. What is the frequency of the black wave?  The correct answer: .25 Hz Pick a place and count the seconds for the wave to return to the same location. Review Section 11-7 in Giancoli. 20. The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also. What is the frequency of the red wave?  The correct answer: .33 Hz Pick a place and count the seconds for the wave to return to the same location. Review Section 11-7 in Giancoli. 21. The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also. What is the velocity of the black wave?  The correct answer: 1 cm/s Velocity is the product of wavelength and frequency. Review Section 11-7 in Giancoli. 22. The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also. What is the velocity of the red wave?  The correct answer: 2 cm/s Velocity is the product of wavelength and frequency. Review Section 11-7 in Giancoli. 23. The picture shows two moving triangular waves.The scale shown at the bottom holds for the vertical scale, also. What is the amplitude of the red wave?  The correct answer: 2 cm Review Section 11-7 in Giancoli. 24. If the effective spring constant of a 2000 kg older car (with poor shocks) is 60000 N/m, what is the period of its vibration after hitting a bump?  The correct answer: 1.15 s Review Section 11-3 Giancoli. 25. What is the effective spring constant of a 10 kg, 1.5 m simple pendulum?  The correct answer: 65 N/m Review Section 11-4 Giancoli.