Module 6 - Chapter Quiz_ PHYS 102 Explorations in Physics - Oct 2023 - Online

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11/25/23, 6:00 AM Module 6 - Chapter Quiz: PHYS 102 Explorations in Physics - Oct 2023 - Online https://erau.instructure.com/courses/164880/quizzes/575443 1/4 Due Nov 26 at 11:59pm Points 100 Questions 10 Available after Nov 20 at 12am Time Limit None Allowed Attempts 3 Instructions This quiz is intended to test you on the information you have acquired in this module. Before starting the quiz, make sure you have completed all module activities with additional emphasis on the following: Read Chapter 6 and be sure you understand the solved problems in the chapter. If you have not already, actively (with paper and pencil) work through the Module 1 first video (entitled Solving Physics Problems) that introduces the 5-step problem-solving technique used throughout this course. This module's additional videos are also helpful. Successfully complete the problems in the textbook End-of-Chapter Problems section. This is an essential step in preparing for this Chapter Quiz. The End-of-Chapter Questions and End-of-Chapter List of Important Equations sections are also helpful. Quiz Instructions 1. Use 9.8 m/s for g (the acceleration due to gravity). 2. Use the conversion factors found in the back of the textbook (not those found on the internet). 3. Answers should be solved in SI units unless other instructions are given in the question. 4. Do not include units in your answer ( numbers only ). 5. Express answers to 3 significant figures unless other instructions are given in the question. 6. To enter an answer in scientific notation in Canvas, use lower-case "e". For example, 6.02 x 10 would be entered as 6.02e+23. A. "+" is optional for positive exponents. B. Do not include spaces in your answer. Questions are presented one at a time. Use caution in navigating back to a previous question – answers are only saved by selecting the Save button or navigating forward to the next question. Attempts: You will have three attempts to take this quiz. After a first wrong answer a hint is provided to help get started but additional steps, including unit conversions, may be needed. Time limit: None Quiz Review: After submitting your quiz, check your results. Incorrect answers will be marked, but the correct answers to those questions will not be shown until your final attempt.  This activity supports Module Objective(s) 1-8 and Learning Outcome(s) 2-4. (https://erau.instructure.com/courses/164880/pages/module-6-overview-and-objectives) Module 6 Waves and Sound Chapter Quiz 2 23 Take the Quiz Again

11/25/23, 6:00 AM Module 6 - Chapter Quiz: PHYS 102 Explorations in Physics - Oct 2023 - Online https://erau.instructure.com/courses/164880/quizzes/575443 2/4 Attempt History Attempt Time Score LATEST Attempt 1 36 minutes 100 out of 100  Correct answers are hidden. Score for this attempt: 100 out of 100 Submitted Nov 25 at 9am This attempt took 36 minutes. 10 / 10 pts Question 1 Calculate the speed (in m/s) of sound in air at a temperature of 76.8 °C. Note: use the eBook equation for the speed of sound in air at various temperatures (section 6.1a and in the end-of-chapter list of important equations). Do not use an equation from the internet or other sources. 374.89 10 / 10 pts Question 2 The cruising sound level in the cabin of a particular jet airliner is 60 dB, but the cabin sound level at take-off is 90 dB. Approximately how many times louder is the cabin take-off sound level compared to the cabin cruising sound level? (Enter a number only -- no symbols) 8 10 / 10 pts Question 3 A wave traveling 77.7 m/s has a wavelength of 3.6 m. What is the frequency of the wave (in Hz)? 21.58

11/25/23, 6:00 AM Module 6 - Chapter Quiz: PHYS 102 Explorations in Physics - Oct 2023 - Online https://erau.instructure.com/courses/164880/quizzes/575443 3/4 10 / 10 pts Question 4 A meteorologist is 3.2 km from a thunderstorm when she sees a lightning bolt emerge from the storm. In how many seconds will she hear thunder after seeing the lightning? Assume air temperature = 20°C and use eBook Table 6.1 to find the speed of sound in air at 20°C. 9.3 10 / 10 pts Question 5 If you face a steep mountain 287 m away and yell, how many seconds will pass before you hear the echo ? (Assume the speed of sound is 344 m/s.) 1.668 10 / 10 pts Question 6 Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of the ultrasound waves themselves. What is the size (in mm) of the smallest feature observable in human tissue when examined with 3.7 MHz ultrasound? The speed of sound in human tissue is 1540 m/s. 0.41 10 / 10 pts Question 7 A guitar string has a linear mass density of 0.006 kg/m. If the string’s tension force is 148 N, what is the speed of waves on the string (in m/s)? 157.3

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11/25/23, 6:00 AM Module 6 - Chapter Quiz: PHYS 102 Explorations in Physics - Oct 2023 - Online https://erau.instructure.com/courses/164880/quizzes/575443 4/4 10 / 10 pts Question 8 A 60 m long, 120 kg steel cable is connected to two poles. The tension force in the cable is 1,068 N. The wind makes the cable vibrate with a frequency of 1.5 Hz. What is the wavelength of the vibrational wave? 15.4 10 / 10 pts Question 9 An 20.9 m long string has a mass of 0.56 kg. Calculate its linear mass density (in kg/m). 0.0267 10 / 10 pts Question 10 An audible sound wave in air at 20°C has a frequency of 521 Hz. Calculate its wavelength (in m). Use eBook Table 6.1 for the speed of sound in air at 20°C. 0.66 Quiz Score: 100 out of 100

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