# physics

You are moving at 120 km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?

1. 👍 0
2. 👎 0
3. 👁 473
1. F = ((V+Vr) / (V+Vs)) * Fo.

V = 120000m/h * (1/3600)h/s = 33.33m/s.

F=((340+33.33) / (340+0))*400=439.2Hz.

1. 👍 1
2. 👎 0
posted by Henry
2. 6.9 m/s

1. 👍 1
2. 👎 0

## Similar Questions

1. ### Physics

A train is moving at a speed of 30 m/s toward a stationary observer at a train station. The train whistle blows with an actual frequency of 336 Hz. What horn frequency is heard by the engineer (riding on the train)?

asked by Anonymous on March 21, 2014
2. ### Physics

You are sitting on a train that is about to drive into a tunnel that is at the base of a large cliff. Just before entering the tunnel, the train blows its whistle, which has a frequency of 600 Hz. (a) What frequency do you hear

asked by Phil on April 17, 2017
3. ### Physics

1. A train whistle has a frequency of 1000 Hz. If the train is speeding at a velocity of 60 km/h past a stationary railroad crossing attendant, what is the apparent frequency a) as the train approaches him, b) as it moves away

asked by James on November 26, 2009
4. ### physics

A train is moving parallel and adjacent to a highway with a constant speed of 23 m/s. A car is traveling in the same direction as the train at 46 m/s. The car’s horn sounds at 550 Hz and the train’s whistle sounds at 360 Hz.

asked by anonumous on January 26, 2014
5. ### physics

A train is moving parallel and adjacent to a highway with a constant speed of 23 m/s. A car is traveling in the same direction as the train at 46 m/s. The car’s horn sounds at 550 Hz and the train’s whistle sounds at 360 Hz.

asked by Need answer by 10pm on January 26, 2014
6. ### physics

A train is moving parallel to a highway with a constant speed of 16.0 m/s. A car is traveling in the same direction as the train with a speed of 36.0 m/s. The car horn sounds at a frequency of 504 Hz, and the train whistle sounds

asked by Anonymous on March 25, 2012
7. ### physics

A train whistle is heard at 280Hz as the train approaches town. The train cuts its speed in half as it nears the station, and the sound of the whistle is then 270 Hz. What is the speed of the train before slowing down? What is the

asked by henry on January 21, 2015
8. ### physics

A train whistle is heard at 310Hz as the train approaches town. The train cuts its speed in half as it nears the station, and the sound of the whistle is then 300 Hz.

asked by ggg on January 26, 2015
9. ### Physics

A physics student sits by the open window on a train moving at 25 m/sec towards the east. Her boyfriend is standing on the station platform, sadly watching her leave. When the train is 150 meters form the station, it emits a

asked by caleb on April 23, 2010
10. ### Physics

A physics student sits by the open window on a train moving at 25 m/sec towards the east. Her boyfriend is standing on the station platform, sadly watching her leave. When the train is 150 meters form the station, it emits a

asked by caleb on April 22, 2010

More Similar Questions