Question

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 heard in this car?

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 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...

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 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 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...

The siren of a police car is heard by a sitting at a cafe. The
police car is traveling at 1.10 x 105 km/hr. If the siren has a
frequency of 1.02 kHz, calculate the frequency heard by the person
as the car moves towards and then away from them.

A car is traveling at a steady 70 km/hkm/h in a 50 km/hkm/h
zone. A police motorcycle takes off at the instant the car passes
it, accelerating at a steady 8.5 m/s^2 to reach the 70 km/h. How
far is the motorcycle from the car when it reaches this speed?
(Time to catch up to the car= 2.3 seconds)

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...

4.) An unmarked police car, traveling a constant 95 km h , is
passed by a speeder traveling 145 km h . Precisely 1.00 s after the
speeder passes, the policeman steps on the accelerator. If the
police car’s acceleration is 2.00 fracms2 , how much time elapses
after the police car is passed until it overtakes the speeder
(assumed moving at constant speed)?
5.) Assume in Problem 4 that the speeder’s speed is not known.
If the police car...

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