# Physics

posted by Alisa

In really stormy weather and with the right conditions, the sky would dump a bunch of hail, making the roads rather hazardous. A choir director was driving his car in these conditions and going a tad fast under the circumstances. His car began to slip on the balls of ice in the road towards two music students walking in front of him, so he leaned on his horn to warn the students to jump out of the way. Since he has career in music, his car horn is set to emit a frequency at exactly Tenor C – 523 Hz. The students have perfect pitch and are able to determine that the frequency that they hear is now 554 Hz (a semitone sharp for any musicians in the room). Since they have also taken Physics with Algebra, they were able to determine the choir director’s speed. What was that speed?

1. bobpursley

Isn't there a standard formula for doppler , stationary listner, moving source?

Source moving towards observer:

f'=fo(vwave/(vwave-Vs)
and you are looking to compute vs

## Similar Questions

1. ### Physics

The burning of gas in a car produces about 12,600 kJ/gallon of energy. If a car averages 35 km/gal when driving 90 km/hr, which requires 18.5 kW, what is the efficiency of the engine under those conditions?
2. ### English

I need you to check these sentences for m, please?
3. ### physics

I'm driving along at a constant speed in my 3 metre long car when I notice that I am accidentally driving through a red light. If the rear of my car passes under the light 0.3 seconds after the front of my car, how fast am I driving …
4. ### physics

I'm driving along at a constant speed in my 3 meter long car when I notice that I am accidentally driving through a red light. If the rear of my car passes under the light 0.3 seconds after the front of my car, how fast am I driving …
5. ### physics

I'm driving along at a constant speed in my 3 meter long car when I notice that I am accidentally driving through a red light. If the rear of my car passes under the light 0.3 seconds after the front of my car, how fast am I driving …
6. ### Geography

Which of the following most accurately describes the difference between climate and weather?
7. ### English

Composition needs to be three to five paragraph long. It must contain an introduction, a body, and a conclusion. Please read!!. Compare and contrast in the winter and driving in the summmer. Throughout the year, safe driving should …
8. ### Physics

Compare the maximum speeds at which a car can safely navigate a flat, unbanked turn of radius 50.0 m in dry conditions versus snowy conditions. The coefficient of static friction in dry weather is 0.90, and in snowy weather it is 0.10. …
9. ### english

Which two elements define a story’s setting?