Homework Help is Here – Start Your Trial Now!
Science
Physics
3. An aircraft is travelling at Mach 0.83 in air at 10 °C. What is its speed in kilometres per hour? lain

3. An aircraft is travelling at Mach 0.83 in air at 10 °C. What is its speed in kilometres per hour? lain

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
See similar textbooks
icon
Related questions
Question

question 3 page 397 thanks

8.5 Questions 1. Researchers at the University of Adelaide, Australia, are proposing to control cyanobacteria with ultrasound. Research this topic using Internet resources, and answer the following questions: (a) What are cyanobacteria, and why are these bacteria important to control? (b) How are cyanobacteria traditionally controlled? (c) Why does the treatment propose using low-frequency ultrasound instead of high-frequency ultrasound? 2. An aircraft is flying at Mach 2. What does this mean? IK/U 3. An aircraft is travelling at Mach 0.83 in air at 10 °C. What is its speed in kilometres per hour? ™ C 4. Explain why the speed of sound varies in the different materials in Table 1 on page 395. Kru 5. In your own words, define (a) sound intensity, (b) loudness, and (c) decibel. U C 6. Why are different units required for sound intensity and loudness? Ku 7. In your own words, describe the concept of sound intensity. K/UC 8. Research the loudness level that is safe for listening to music on, for example, a personal music player. (a) Is there a difference in the level depending on the length of exposure? (b) Suppose the volume scale of a personal music player ranges from 0 to 10. Suppose also that each level corresponds to an increase in volume of 10 dB. So volume 1 = 30 dB and volume 3 = 50 dB, and so on. What is the loudest level you should set your personal music player to if you listen to music for 2 h a day? 9. A busy city street can produce sound levels near 90 dB, depending on the number of large vehicles (Figure 2). Calculate the ratio of the sound intensity of a power saw to that of a city street. Refer to Table 2 on page 395. Express your answer in words. ™Ⓒ Figure 2 10. A burglar coughs with an intensity of 2.35 x 10-7 W/m². The burglar alarm is sensitive to an intensity of 1.0 x 10-1⁰ W/m² and will ring if the detected sound is 30 dB greater than its detection threshold. Will the burglar's cough be detected? ™Ⓒ 11. The federal government supports the construction of noise barriers (also called sound baffles) on the sides of highways that run through residential areas to reduce residential noise. Research highway traffic noise barriers. (a) What are the barriers made of? (b) How do they work? (c) How effective are the barriers in reducing residential noise? GO TO NELSON SCIENCE
Transcribed Image Text:8.5 Questions 1. Researchers at the University of Adelaide, Australia, are proposing to control cyanobacteria with ultrasound. Research this topic using Internet resources, and answer the following questions: (a) What are cyanobacteria, and why are these bacteria important to control? (b) How are cyanobacteria traditionally controlled? (c) Why does the treatment propose using low-frequency ultrasound instead of high-frequency ultrasound? 2. An aircraft is flying at Mach 2. What does this mean? IK/U 3. An aircraft is travelling at Mach 0.83 in air at 10 °C. What is its speed in kilometres per hour? ™ C 4. Explain why the speed of sound varies in the different materials in Table 1 on page 395. Kru 5. In your own words, define (a) sound intensity, (b) loudness, and (c) decibel. U C 6. Why are different units required for sound intensity and loudness? Ku 7. In your own words, describe the concept of sound intensity. K/UC 8. Research the loudness level that is safe for listening to music on, for example, a personal music player. (a) Is there a difference in the level depending on the length of exposure? (b) Suppose the volume scale of a personal music player ranges from 0 to 10. Suppose also that each level corresponds to an increase in volume of 10 dB. So volume 1 = 30 dB and volume 3 = 50 dB, and so on. What is the loudest level you should set your personal music player to if you listen to music for 2 h a day? 9. A busy city street can produce sound levels near 90 dB, depending on the number of large vehicles (Figure 2). Calculate the ratio of the sound intensity of a power saw to that of a city street. Refer to Table 2 on page 395. Express your answer in words. ™Ⓒ Figure 2 10. A burglar coughs with an intensity of 2.35 x 10-7 W/m². The burglar alarm is sensitive to an intensity of 1.0 x 10-1⁰ W/m² and will ring if the detected sound is 30 dB greater than its detection threshold. Will the burglar's cough be detected? ™Ⓒ 11. The federal government supports the construction of noise barriers (also called sound baffles) on the sides of highways that run through residential areas to reduce residential noise. Research highway traffic noise barriers. (a) What are the barriers made of? (b) How do they work? (c) How effective are the barriers in reducing residential noise? GO TO NELSON SCIENCE
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Mass
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
College Physics
College Physics
Physics
ISBN:
9781305952300
Author:
Raymond A. Serway, Chris Vuille
Publisher:
Cengage Learning
University Physics (14th Edition)
University Physics (14th Edition)
Physics
ISBN:
9780133969290
Author:
Hugh D. Young, Roger A. Freedman
Publisher:
PEARSON
Introduction To Quantum Mechanics
Introduction To Quantum Mechanics
Physics
ISBN:
9781107189638
Author:
Griffiths, David J., Schroeter, Darrell F.
Publisher:
Cambridge University Press
Physics for Scientists and Engineers
Physics for Scientists and Engineers
Physics
ISBN:
9781337553278
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:
9780321820464
Author:
Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:
Addison-Wesley
College Physics: A Strategic Approach (4th Editio…
College Physics: A Strategic Approach (4th Editio…
Physics
ISBN:
9780134609034
Author:
Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:
PEARSON
SEE MORE TEXTBOOKS