Posted by **Cooper** on Tuesday, November 22, 2011 at 8:44pm.

Two ships in a heavy fog are blowing their horns, both of which produce sound with a frequency of 165.0 Hz One ship is at rest; the other moves on a straight line that passes through the one at rest.

If people on the stationary ship hear a beat frequency of 3.5 Hz, what is the speed of the approaching ship?

If people on the stationary ship hear a beat frequency of 3.5 Hz, what is the speed of the receding ship?

- Physics -
**drwls**, Wednesday, November 23, 2011 at 7:38am
There are two possible received frequencies that would produce that beat frequency. One corresponds to the ships approaching each other and the other for when they are separating. They don't say clearly which case it is.

Assume they are approaching. In that case the received frequency is 168.5 Hz

Use the appropriate Doppler shift formula to compute the moving ship's velocity. Both cases should give NEARLY the same answer, about 7 m/s assuming a sound speed of 340 m/s. You will need to assume an air temperature to get an accurate sound speed.

## Answer this Question

## Related Questions

- Math-Calculus - Consider two ships which are joined by a cable attached to each ...
- physics - .Two automobiles are equipped with the same single-frequency horn. ...
- physics - Two trains are moving in opposite diections on parallel tracks and are...
- Physics - Frequency - While blowing its horn of frequency 580 Hz, a car ...
- Physics - Both drawings show the same square, each of which has a side of length...
- Physics - Two cars have identical horns, each emitting a frequency of f= 395 hz...
- physics - While blowing its horn of frequency 466 Hz, a car accelerates at 0.84 ...
- trig - Help! Ships A and B leave port at the same time and sail on straight ...
- physics - two cars are heading at each other with the same speed v. The horn of ...
- physics - 1)As a sound source moves away from a stationary observer, the number ...