Question

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 comma.

Answer #1

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 sounding a siren with a frequency of 1590 HzHz is
traveling at 130 km/hkm/h .
a) What frequencies does an observer standing next to the road
hear as the car approaches and as it recedes?
b) What frequencies are heard in a car traveling at 90.0
km/hkm/h in the opposite direction before and after passing the
police car?
c) The police car passes a car traveling in the same direction
at 80.0 km/hkm/h. What two frequencies are...

2.
1189
A police car is sounding a siren with 1340 Hz on a 20°C
day.
Answers must be within 2 Hz of correct answer.
Part
Description
Answer
Save
Status
A.
You are standing beside the
road. What frequency do you hear as the police car approaches you
at 128 km/hr?
(include units with answer)
A: 1495 Hz
C: 1494.97 Hz
Hints: 0,0
# tries: 1
B.
You are standing beside the
road. What frequency do you hear after...

2.
1189
A police car is sounding a siren with 1340 Hz on a 20°C
day.
Answers must be within 2 Hz of correct answer.
Part
Description
Answer
Save
Status
A.
You are standing beside the
road. What frequency do you hear as the police car approaches you
at 128 km/hr?
(include units with answer)
A: 1495 Hz
C: 1494.97 Hz
Hints: 0,0
# tries: 1
B.
You are standing beside the
road. What frequency do you hear after...

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
per...

A pedestrian standing on the sidewalk heard a frequency of 845
Hz when an ambulance is traveling away from him with a speed of
45.0 m/s. Speed of sound in air = 343 m/s
A) what is the frequency of the ambulance siren? Express your
answer using three significant figures.
B) Then the ambulance stopped for a few seconds while sounding
the siren. A driver in a car that is coming towards the ambulance
heard a frequency of 995 Hz....

A pedestrian standing on the sidewalk heard a frequency of 850
Hz when an ambulance is travelling away from him with a speed of
45.0 m/s m / s . Speed of the sound in air = 343 m/s Part A What is
the frequency of the ambulance's siren? Express your answer using
three significant figures. Part B Then the ambulance stopped for a
few seconds while sounding the siren. A driver in a car that is
coming towards the...

A pedestrian standing on the sidewalk heard a frequency of 835
HzHz when an ambulance is travelling away from him with a speed of
30.0 m/sm/s .
Speed of the sound in air = 343 m/s
a)What is the frequency of the ambulance's
siren?
b)Then the ambulance stopped for a few seconds while sounding
the siren. A driver in a car that is coming towards the ambulance
heard a frequency of 950 HzHz . What is the speed of the...

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...

1. An airplane is traveling 835 km/h in a direction 41.5 ∘
west of north
PART A
Find the components of the velocity vector in the northerly
and westerly directions. Enter your answers using three significant
figures separated by a comma.
PART B
How far north and how far west has the plane traveled after
4.00 h? Enter your answers using three significant figures
separated by a comma.
BOTH
QUESTIONS NEED TWO ANSWERS.
2. A football is kicked at ground...

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