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Author Question: Two police cars have identical sirens that produce sound of frequency of 570 Hz. A stationary ... (Read 90 times)

Ebrown

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on: Jul 29, 2018
Two police cars have identical sirens that produce sound of frequency of 570 Hz. A stationary listener is standing between two cars.
 
  One car is parked and the other is approaching the listener and both have their sirens on. The listener measures 9.0 beats per second. Find the speed of the approaching police car. The speed of sound is 340 m/s.

Question 2

A violin with string length 32 cm and string density resonates in its fundamental with the first overtone of a 2.0-m organ pipe with one end closed and one end open. What is the tension in the string if the speed of sound in air is 344 m/s?
 
  A) 110 N B) 4100 N C) 56 N D) 1000 N E) 450 N


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kilada

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Reply #1 on: Jul 29, 2018
Answer to Question 1

5.3 m/s

Answer to Question 2

D


Ebrown

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Reply #2 on: Jul 29, 2018
Thank you!


kilada

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Reply #3 on: Jul 29, 2018
Always glad to help...


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