Question

A driver travels northbound on a highway at a speed of 24.0 m/s. A police car, traveling southbound at a speed of 31.0 m/s, approaches with its siren producing sound at a frequency of 2400 Hz.

(a) What frequency does the driver observe as the police car approaches? Hz

(b) What frequency does the driver detect after the police car passes him? Hz

(c) Repeat parts (a) and (b) for the case when the police car is traveling northbound.

while police car overtakes Hz ?

after police car passes?

Answer #1

A motorcyclist is traveling north on a road at a speed of 29.0
m/s. A fire truck, traveling south at a speed of 49.0 m/s,
approaches with its siren producing sound at a frequency of 2550
Hz. (Enter your answers in Hz. Assume that the speed of sound in
air is 343 m/s.)
(a)
What frequency does the motorcyclist observe as the fire truck
approaches? (Enter your answer to the nearest integer.)
(b)
What frequency does the motorcyclist detect after...

A truck moving at 36 m/s passes a police car moving at 45 m/s in
the opposite direction. The frequency of the sound emitted by the
siren on the police car is 500 Hz and the speed of sound in air is
343 m/s.
(a) What is the frequency heard by an observer in the truck as
the police car approaches the truck?
(b) What is the frequency heard by an observer in the truck
after the police car passes...

A police car moving at 67 m/s is initially behind a truck moving
in the same direction at 23 m/s. The natural frequency of the car's
siren is 715Hz. The change in frequency observed by the truck
driver as the car overtakes him is _____Hz

A police car sounding a siren with a frequency of 1600 Hz is
traveling at 115 km/h . What frequencies does an observer standing
next to the road hear as the car approaches and as it recedes? What
frequencies are heard in a car traveling at 90.0 km/h in the
opposite direction before and after passing the police car? The
police car passes a car traveling in the same direction at 80.0
km/h. What two frequencies are heard in this...

A police car with a siren of 300 Hz. is moving toward a
warehouse at 30 m/s. What frequency does the driver hear reflected
from the warehouse? The speed of sound is 343 m/s.

A police car, traveling a constant 100 km/h, is passed by a
speeder. Precisely 1.1 s
after the speeder passes, the policeman step on the accelerator.
The police car
acceleration is 3 m/s 2 . The policeman overtakes the speeder after
6s, what was the
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A police car, traveling a constant 100 km/h, is passed
by a speeder. Precisely 1.1 s after the speeder passes, the
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m/s2. The policeman overtakes the speeder after 6s, what
was the speeder’s speed?

A train is moving parallel and adjacent to a highway with a
constant speed of 31 m/s. A car is traveling in the same direction
as the train at 55 m/s. The train’s whistle sounds at 330 Hz. When
the car is behind the train what frequency does an occupant of the
car observe for the train whistle? The speed of sound is 343 m/s.
Answer in units of Hz.

The driver drives at a fixed speed (v = 30.0m / s), and detects a police officer on a stationary motorcycle. The police officer starts when the driver of the car is 100m ahead of the police officer. The police officer gives everything to the bottom and travels at a fixed acceleration (a = 5, 00m / s2) after the driver.
a) After how long does the police officer reach the driver?
b) What is the speed of the police...

A stationary police car emits a sound of frequency 1225 Hz that
bounces off of a car on the highway and returns with a frequency of
1265 Hz. The police car is right next to the highway, so the moving
car is traveling directly toward or away from it.
What frequency would the police car have received if it had been
traveling toward the other car at 22.0 m/s?
P/s: the car was moving 5.53 m/s

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