Concept explainers
Consider the waves in Figure 17.8 to be waves on a stretched string. Define the velocity of elements of the string as positive if they are moving upward in the figure. (i) At the moment the string has the shape shown by the red-brown curve in Figure 17.8a, what is the instantaneous velocity of elements along the string? (a) zero for all elements (b) positive for all elements (c) negative for all elements (d) varies with the position of the element (ii) From the same choices, at the moment the string has the shape shown by the red-brown curve in Figure 17.8b, what is the instantaneous velocity of elements along the string?
Trending nowThis is a popular solution!
Chapter 18 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
- A 60.00-cm guitar string under a tension of 50.000 N has a mass per unit length of 0.100 00 g/cm. What is the highest resonant frequency that can be heard by a person capable of hearing frequencies up to 20 000 Hz?arrow_forwardIf you're in Albany,NY (ALB) and you see lightning in the distance and 12 seconds later you hear thunder, approximately how far away is the storm?arrow_forwardThe height of the speaker stack was designed to be equal to the wavelength of the sound wave produced by the lowest string. If the frequency of this harmonic vibration is 31 Hz and the length of the string is 0.89m (89cm), what is the speed of the ave on the string? If the density of the string is 0.0657 kg/m what is the Tension of the string? If the speed of sound is 343 m/s what will be the wavelength of the sound made by the first harmonic vibration (hint: this is the height of the tallest stack of speakers)arrow_forward
- The note E4 is played on a piano and has a frequency of f = 393.88. If the linear mass density of this string of the piano is μ = 0.012 kg/m and the string is under a tension of 1000.00 N, what is the speed of the wave on the string and the wavelength of the wave?arrow_forwardA piano wire has a linear mass density of μ=4.95×10^−3kg/m Under what tension must the string be kept to produce waves with a wave speed of 500.00 m/s?arrow_forwardA supersonic plane is flying at Mach 5 at an altitude of 8km where the speed of sound is 320m/s. How long after the plane passes directly overhead will you hear the sonic boom?arrow_forward
- A 62.00-cm guitar string under a tension of 35.000 N has a mass per unit length of 0.10000 g/cm. What is the highest resonant frequency that can be heard by a person capable of hearing frequencies up to 22,000 Hz? (Enter your answer to at least five significant figures.) _____KHzarrow_forwardA crude approximation of voice production is to consider the breathing passages and mouth to be a resonating tube closed at one end. What is the fundamental frequency ?1�1 if the tube is 0.280 m0.280 m long, by taking air temperature to be 37.0∘C? What would this frequency become if the person's breathing passage were filled with hydrogen instead of air? Assume the same temperature dependence for hydrogen as for air.arrow_forwardA standing wave with 4 anti-nodes is set up in a string that has a linear mass density of 0.011 kg/m and pulled tight with a tension force of 1.7 N. If the string has a length of 1.3 meters, what is the frequency of this standing wave?arrow_forward
- Suppose you want to demonstrate the Doppler effect for deep-water waves, using a 7.21 Hz source moving toward a stationary observer. How fast would the source have to move through the water if the frequency of the waves seen by the observer is to be nine times the frequency of the source? (The answer is not 1333.33 m/s or 0.168 m/s)arrow_forwardSuppose you want to demonstrate the Doppler effect for deep-water waves, using a 7.21 Hz source moving toward a stationary observer. How fast would the source have to move through the water if the frequency of the waves seen by the observer is to be nine times the frequency of the source?arrow_forwardThe lowest frequency of a guitar string with a length 0.65 m is 248 Hz. What is the speed of the wave on this string? Same guitar, same string as in Question 1. If the mass per unit length of the string is 0.5g/m, what is the tension on the string? A tuning fork produces two maxima, n =1 and n =3, separated by 48 cm. Find the frequency of the tuning fork. The speed of sound in helium is 1000 m/s. Suppose you use a tuning fork with a frequency of 512Hz. What would be the separation of the two maxima (L3/4−L1/4) in a standing wave apparatus like the one you used in the lab, if the tube were filled with helium gas? Using Eq. (14.4), determine how the resonant frequency depends on the air temperature. (Hint: consider how the density ρ depends on temperature when pressure p is fixed.)arrow_forward
- Classical Dynamics of Particles and SystemsPhysicsISBN:9780534408961Author:Stephen T. Thornton, Jerry B. MarionPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning