Question

A truck traveling eastward is moving at 16.0 m/s . a
police car is traveling westward at 46.0m/s if the frequency of the
sound coming from the police siren is a constant 520.0 Hz( actually
produced frequency), what is the change in frequency (in Hz) heard
by an observer in the truck as the two vehicles approach each other
as compared to moving away from each other? the temperature of the
air is 95.0 degree F.

a. 240

b. 236

c.230

d.213

e.183

Answer #1

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...

PLEASE SHOW ALL STEPS
A fire truck moving at a speed of 40.0 m/s sounds its siren, which
has a frequency of 1250 Hz. It is
passing by a stationary observer in a quiet neighborhood on a
day when the temperature is 24.0° C.
A) What is the speed of sound in air on this day?
B) Calculate the frequency of the siren as heard by the
stationary observer when the fire truck is approaching the
observer.
C)
Calculatethefrequencyofthesirenasheardbythestationaryobserverwhenthefiretruckis
moving...

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) A fire truck with the 500 Hz siren on approaches an observer
at 50 m/s, who is at rest. What frequency would observer detect?
(b) A fire truck with the 500 Hz siren on is at rest. An observer
approaches the fire truck with the speed of 50 m/s. What frequency
would the observer detect? (The speed of sound is 343 m/s.)

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...

A siren of a police car at rest emits at a predominant frequency
of 1310 Hz. A frequency of 1390_Hz is heard when the police car is
approaching an observer standing by a bus stop. a) What is the
velocity of the police car in m/s? b) what will be the frequency
heard by the person standing at the bus stop when the police car is
moving away? and c) Report the velocity of the police car in miles
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A police car sounding a siren with a frequency of 1560 Hz is
traveling at 110 km/h . A.What frequencies does an observer
standing next to the road hear as the car approaches and as it
recedes? Express your answers using three significant figures
separated by a comma. B.What frequencies are heard in a car
traveling at 90.0 km/h in the opposite direction before and after
passing the police car? Express your answers using three
significant figures separated by a...

A police car with a siren of 300 Hz. is moving toward a
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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...

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