« 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 72 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?

Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.

Did you know?

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

Did you know?

Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

Did you know?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

Did you know?

It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

Movement of sound waves through the human ear. Movement of sound waves through the human ear.
The frequency of competition according to the number of species involved. The frequency of competition according to the number of species involved.
Nucleosome side on Nucleosome side on
The grey side-gilled sea slug Pleurobranchaea maculata. The discovery of tetrodotoxin in this slug i The grey side-gilled sea slug Pleurobranchaea maculata. The discovery of tetrodotoxin in this slug i
The Police - Every Little Thing She Does Is Magic The Police - Every Little Thing She Does Is Magic
The gradient of the B allele of the ABO blood groups from East to West is due to waves of migration The gradient of the B allele of the ABO blood groups from East to West is due to waves of migration
Video: Transmission Across a Synapse

For a complete list of videos, visit our video library