A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away from a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s. Select one: a. 378 Hz b. 422 Hz c. 411 Hz d. 389 Hz O e. 450 Hz

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)...
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A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away from a stationary pedestrian. What
frequency does the pedestrian hear? The speed of sound in air is 343 m/s.
Select one:
a. 378 Hz
O b. 422 Hz
O c. 411 Hz
d. 389 Hz
O e. 450 Hz
Transcribed Image Text:A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away from a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s. Select one: a. 378 Hz O b. 422 Hz O c. 411 Hz d. 389 Hz O e. 450 Hz
Determine the change in length of a 20 m railroad track made of steel if the temperature is changed from -15 C to +85 C. (ASTEEL = 1.1 x 10-
5/C°)
Select one:
O a. 1.1
O
O
b. 2.75
c. 1.38
d. 2.2
e. 0.55
Transcribed Image Text:Determine the change in length of a 20 m railroad track made of steel if the temperature is changed from -15 C to +85 C. (ASTEEL = 1.1 x 10- 5/C°) Select one: O a. 1.1 O O b. 2.75 c. 1.38 d. 2.2 e. 0.55
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Follow-up Question
Determine the change in length of a 20 m railroad track made of steel if the temperature is changed from -15 C to +85 C. (ASTEEL = 1.1 x 10-
5/C°)
Select one:
O a. 1.1
O
O
b. 2.75
c. 1.38
d. 2.2
e. 0.55
Transcribed Image Text:Determine the change in length of a 20 m railroad track made of steel if the temperature is changed from -15 C to +85 C. (ASTEEL = 1.1 x 10- 5/C°) Select one: O a. 1.1 O O b. 2.75 c. 1.38 d. 2.2 e. 0.55
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