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Author Question: The siren on a police car emits waves with a frequency f = 500 Hz. You are standing by the side of ... (Read 78 times)

anshika

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on: Jul 29, 2018
The siren on a police car emits waves with a frequency f = 500 Hz. You are standing by the side of the road when a police car, sounding its siren,
 
  approaches you at 30.0 m/s. What frequency do you hear? The speed of sound is 340 m/s.
  A)
 
  544 Hz
 
  B)
 
  540 Hz
 
  C)
 
  548 Hz
 
  D)
 
  532 Hz
 
  E)
 
  536 Hz

Question 2

If the velocity of an object is zero, does it mean that the acceleration is zero? Support your answer with an example.
 
  A)
 
  no, and an example would be an object starting from rest
  B)
 
  no, and an example would be an object coming to a stop
  C)
 
  yes, and an example would be an object sitting at rest
  D)
 
  yes, because of the way in which velocity is defined
  E)
 
  yes, because of the way in which acceleration is defined


jliusyl

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

C

Answer to Question 2

A


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