In: Physics

An ambulance traveling eastbound at 144.0 km/h with sirens
blaring at a frequency of 7.50 ✕ 10^{2} Hz passes cars
traveling in both the eastbound and westbound directions at53.0
km/h. (Assume the speed of sound is 343 m/s.)

(a) What is the frequency observed by the eastbound drivers as
the ambulance approaches from behind?

_______Hz

(b) What is the frequency observed by the eastbound drivers after
the ambulance passes them?

_______Hz

(c) What is the frequency observed by the westbound drivers as the
ambulance approaches them?

________ Hz

(d) What is the frequency observed by the westbound drivers after
the ambulance passes them?

_________ Hz

a)

V_{L} = speed of listener = speed of eastbound drivers =
53 km/h = 53 (5/18) m/s = 14.72 m/s

V_{s} = speed of source = speed of eastbound ambulance =
144 km/h = 144 (5/18) = 40 m/s

frequncy observed by the eastbound drivers is given as

f' = (V - V_{L}) f / (V - V_{s})

f' = (343 - 14.72) (650) / (343 - 40) = 704.23 Hz

b)

V_{L} = speed of listener = speed of eastbound drivers =
53 km/h = 53 (5/18) m/s = 14.72 m/s

V_{s} = speed of source = speed of eastbound ambulance =
144 km/h = 144 (5/18) = 40 m/s

frequncy observed by the eastbound drivers is given as

f' = (V - V_{L}) f / (V + V_{s})

f' = (343 + 14.72) (650) / (343 + 40) = 607.1 Hz

c)

V_{L} = speed of listener = speed of eastbound drivers =
53 km/h = 53 (5/18) m/s = 14.72 m/s

V_{s} = speed of source = speed of eastbound ambulance =
144 km/h = 144 (5/18) = 40 m/s

frequncy observed by the eastbound drivers is given as

f' = (V + V_{L}) f / (V - V_{s})

f' = (343 + 14.72) (650) / (343 - 40) = 767.4 Hz

d)

V_{L} = speed of listener = speed of eastbound drivers =
53 km/h = 53 (5/18) m/s = 14.72 m/s

V_{s} = speed of source = speed of eastbound ambulance =
144 km/h = 144 (5/18) = 40 m/s

frequncy observed by the eastbound drivers is given as

f' = (V - V_{L}) f / (V + V_{s})

f' = (343 - 14.72) (650) / (343 + 40) = 557.13 Hz

An ambulance traveling eastbound at 114.0 km/h with sirens
blaring at a frequency of 6.50 ✕ 102 Hz passes cars traveling in
both the eastbound and westbound directions at 59.0 km/h. (Assume
the speed of sound is 343 m/s.)
(a) What is the frequency observed by the eastbound drivers as
the ambulance approaches from behind? Hz
(b) What is the frequency observed by the eastbound drivers
after the ambulance passes them? Hz
(c) What is the frequency observed by the...

(a) What frequency is received by a person watching an oncoming
ambulance moving at 105 km/h and emitting a steady 833 Hz sound
from its siren? The speed of sound on this day is 345 m/s.
_____Hz
(b) What frequency does she receive after the ambulance has
passed?
_____ Hz

An unmarked police car traveling a constant 80.0 km/h is passed
by a speeder traveling 135 km/h . Precisely 2.00 s after the
speeder passes, the police officer steps on the accelerator; if the
police car's acceleration is 1.60 m/s2 , how much time passes
before the police car overtakes the speeder after the speeder
passes (assumed moving at constant speed)?

An unmarked police car traveling a constant 85 km/h is passed by
a speeder traveling 139 km/h . Precisely 1.00 s after the speeder
passes, the police officer steps on the accelerator; if the police
car's acceleration is 2.40 m/s2 , how much time passes after the
police car is passed by a speeder and before the police car
overtakes the speeder (assumed moving at constant speed)?

An unmarked police car traveling a constant 80.0 km/h is passed
by a speeder traveling 115 km/h . Precisely 1.50 s after the
speeder passes, the police officer steps on the accelerator; if the
police car's acceleration is 2.50 m/s2 , how much time passes
before the police car overtakes the speeder after the speeder
passes (assumed moving at constant speed)?

1) 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)?
2) Assume in Problem 1 that the speeder’s speed is not known. If
the police car...

A cameraman on a pickup truck is traveling westward at 23 km/h
while he videotapes a cheetah that is moving westward 23 km/h
faster than the truck. Suddenly, the cheetah stops, turns, and then
run at 48 km/h eastward, as measured by a suddenly nervous crew
member who stands alongside the cheetah's path. The change in the
animal's velocity takes 2.2 s. What are the (a)
magnitude and (b) direction of the animal’s
acceleration according to the cameraman and the...

A cameraman on a pickup truck is traveling westward at 16 km/h
while he videotapes a cheetah that is moving westward 31 km/h
faster than the truck. Suddenly, the cheetah stops, turns, and then
run at 50 km/h eastward, as measured by a suddenly nervous crew
member who stands alongside the cheetah's path. The change in the
animal's velocity takes 1.7 s. What are the (a)
magnitude and (b) direction of the animal

A space vehicle is traveling at 4300 km/h relative to earth when
the exhausted rocket motor (mass 4m) is disengaged and sent
backward with a speed of 82 km/h relative to the command module
(mass m).a) What is the speed of the space vehicle after the engine
has separated relative to earth? b) What is the speed of the
command module relative to earth just after the separtaion.

how would the car react to a temporary signage (construction)
traffic cops,or ambulance with sirens trying to pass them?

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