Question

A train on one track moves in the same direction as a second train on the adjacent track. The first train, which is ahead of the second train and moves with a speed of 36.4 m/s , blows a horn whose frequency is 125 Hz . If the frequency heard on the second train is 134 Hz , what is its speed?

Answer #1

A light-rail commuter train blows its 200 Hz horn as it
approaches a crossing. The speed of sound is 341 m/s.
(a) An observer waiting at the crossing receives a frequency of
213 Hz. What is the speed of the train? ____m/s
(b) What frequency does the observer receive as the train moves
away? ____Hz

A train approaches a crossing at a speed of 20.0 m/s, sounding
a horn with a frequency
of 1000 Hz. A driver stopped at the crossing blows his horn (f
= 800 Hz) in frustration.
(a) What frequency does the driver hear coming from the
approaching train horn?
(b) The driver continues blowing his horn after the train
passes. What frequency does the
train engineer hear coming from the car horn as the train
moves away from the crossing?

Iron man loves to listen to the Doppler Effect. While waiting
for a commuter train that blows its 200-Hz horn as it approaches a
crossing he observes the frequency to be 208 Hz. [It is a nice day
and the speed of sound is 335 m/s] What frequency does he observe
as the train moves away?

A commuter train blows its horn as it passes a passenger
platform at a constant speed of 37.3 m/s. The train horn sounds at
a frequency of 340 Hz when the train is at rest. What is the
frequency observed by a person on the platform as the train
approaches?
What is the frequency observed by that person as the train
recedes from him?
Calculate the wavelength for the approaching train.
Calculate the wavelength for the receding train.

Two trains are traveling on the same track in the same
direction. The whistles of both trains produce a 440Hz frequency
sound. The lead train is traveling at 120km/hr. Both trains blow
their whistles. The driver of the lead train hears that the
following train has a higher frequency sound. She also notices an
oscillation of 4.0 Hz.
A.) How do you explain the higher frequency sound heard by the
lead train driver?
B.) How do you explain the 4.0Hz...

Two firecrackers explode simultaneously 125 m apart
along a straight railroad track. A train
moves along the track at 25 m s−1.
(a) How far apart are the explosions as measured by the train
driver?
(b) If instead of a simultaneous explosion, the firecracker 125 m
farther ahead explodes 3 s
before the other. How far apart would the explosions be to the
train driver?
(c) What can you conclude from your calculations in (a) and
(b)?

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.

Acommuter train passes a passenger platform at a constant speed
of 43.1 m/s. The train horn is sounded at its characteristic
frequency of 322 Hz.
(a) What overall change in frequency is detected by a person on
the platform as the train moves from approaching to receding?
(Indicate whether the frequency increases of decreases with the
sign of your answer.)
(b) What wavelength is detected by a person on the platform as
the train approaches?

Two trains are traveling toward each other. One train is
traveling at 31 [m/sec] from our left to the right. The other train
is traveling at 40 [m/sec] from the right to the left. The train on
the left blows the whistle at fο = 520 [Hz]. a) What is the
frequency heard on the other train in still air? b) What is the
frequency heard on the other train if there is wind blowing from
the right to the...

1. A commuter train blows its horn as it passes a passenger
platform at a constant speed of 41.8 m/s. The train horn sounds at
a frequency of 335 Hz when the train is at rest. What is the
frequency observed by a person on the platform as the train
approaches? REPORT ALL ANSWERS IN 4 DECIMALS
2. What is the frequency observed by that person as the train
recedes from him? REPORT ALL ANSWERS IN 4
DECIMALS
3. Calculate...

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