1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
bonufazy [111]
2 years ago
13

The driver of a stationary car hears a siren of an approaching police car at a frequency of 280Hz. If the actual frequency of th

e siren is 240Hz, find the speed of the police car (speed of sound is 343m/s).
Physics
1 answer:
deff fn [24]2 years ago
5 0

Answer:

The speed of the police car is 294 m/s

Explanation:

Given;

frequency of the siren in air, f = 280 Hz

speed of sound in air, v = 343 m/s

Determine the wavelength of the sound in air to the stationary car:

v = fλ

where;

λ is wavelength of the sound

λ = v/f

λ = 343 / 280

λ = 1.225 m

Now, determine the speed at which the police car is approaching the stationary car;

The actual frequency of the police car, F = 240 Hz

V = Fλ

Where;

V is speed of the police car

λ is the distance between the police car and the stationary car, (wavelength)

V = 240 x 1.225

V = 294 m/s

Therefore, the speed of the police car is 294 m/s

You might be interested in
Solve this system of equations without graphing and show your reasoning <br><br> 5x+y=7<br> 20x+2=y
tatuchka [14]

Answer:

Explanation:

5x + y = 7

20x - y = -2

    25x = 5

        x = (1/5)

5(1/5) + y = 7

1 + y = 7 .

y = 6

8 0
2 years ago
Scientific theories can change over time as new information is discovered if a scientififc theory changes does this mean that it
Verdich [7]
Not necessarily, it just means that the Scientific theory was not complete and needs additional information, research, and ideas. 
3 0
3 years ago
Read 2 more answers
Which of the following best describes transverse waves?
den301095 [7]

Best Answer: perpendicular to the direction of wave motion

think of you and a friend holding different ends of a rope. you shake your end side to side and the wave travels down to your friend's end. if you pay attention to a given segment of the rope, it moves, but it moves to the right and left while the wave travels forward. in a transverse wave, the constituents of the wave move perpendicular to the direction of motion of the wave itself.

a longitudinal wave, on the other hand, is the opposite. the constituents of the wave alternate moving in the same or opposite direction as the wave moves. this one is more like if you and your friend were holding onto a slinky. you give your end a push towards your friend, and you can see the wave move towards the other end.

hope that helps :D
5 0
3 years ago
Read 2 more answers
How do liquids and gases transfer heat?
adoni [48]
I believe it’s C, by the air movement
4 0
2 years ago
Read 2 more answers
Sorry I keep asking questions, but if two forces on an object are balanced, will it move? (Im also trying to get rid of my point
Dmitrij [34]
If they are equal amounts in force then No it won't.
6 0
2 years ago
Read 2 more answers
Other questions:
  • How many weeks are in the regular NFL season?
    10·2 answers
  • Newton's law of universal gravitation can be applied to
    5·2 answers
  • The intensity of light from a star varies inversely as the square of the distance. If you lived on a planet ten times farther aw
    7·1 answer
  • 7. A neutral aluminum rod is at rest on a foam insulating base. A negatively charged balloon is brought near one end of the rod
    14·1 answer
  • Calculate the impulse imparted when a 3,000-kg car hits a wall at 60 . m/s and comes to a stop.
    6·1 answer
  • The surface of the dock is 6 feet above the water. If you pull the rope in at a rate of 2 ft/sec, how quickly is the boat approa
    13·1 answer
  • A beaker weighs 0.4N when empty and1.4N when filled with water what does ot weigh when filled with brine of density 1.2 g/cm3
    13·1 answer
  • PLEASE ANSWER THIS ASAP I WILL MARK YOU THE BRAINLIEST The actual subject is Science but they dont have that as a option in pick
    15·1 answer
  • When an object (like a ball) falls, some of its___ energy changes to ___ energy, due to the law of conservation of energy
    13·1 answer
  • Cancer and diabetes are two common hereditary diseases.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!