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Author Question: A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches ... (Read 84 times)

asmith134

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on: Jul 27, 2018
A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s.
 
  A) 200 Hz
  B) 375 Hz
  C) 400 Hz
  D) 425 Hz
  E) 450 Hz

Question 2

What length of copper wire (resistivity 1.68  10-8 m) of diameter 0.15 mm is needed for a total resistance of 15 ?
 
  A) 16 mm
  B) 16 cm
  C) 1.6 m
  D) 16 m
  E) 160 m


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aham8f

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Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

D


asmith134

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Reply 2 on: Jul 27, 2018
Wow, this really help

shewald78

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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