« previous next »

Author Question: The siren on a police car emits waves with a frequency f = 500 Hz. You are standing by the side of ... (Read 53 times)

anshika

  • Hero Member
  • *****
  • Posts: 510
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

  • Sr. Member
  • ****
  • Posts: 328
Reply #1 on: Jul 29, 2018
Answer to Question 1

C

Answer to Question 2

A


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Did you know?

As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Did you know?

Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

How Seismic Waves Pass through Rock How Seismic Waves Pass through Rock
Charles and Ray Eames, Side Chair, Model DCM. Charles and Ray Eames, Side Chair, Model DCM.
The Upper Troposphere: Rossby Waves The Upper Troposphere: Rossby Waves
Hacking. Tapotement performed with the ulnar side of relaxed hands. Hacking. Tapotement performed with the ulnar side of relaxed hands.
Adjust drape for abdominal massage, and stand at the side of the table facing the head. Place hands ... Adjust drape for abdominal massage, and stand at the side of the table facing the head. Place hands ...
What is the frequency of individuals that are homozygous for this allele? What is the frequency of individuals that are homozygous for this allele?
Video: Homeostasis (range of body conditions, normal limits, mild stresses & severe stresses)

For a complete list of videos, visit our video library