Shown below the red train is stationary and the green train is moving forward at a speed of 37M/S between the trains is a bicycle list moving forward at 15.2 M/SH train has a whistle with a frequency of 345 hz The air temperature is 7°C

Electrical power lines connected by two utility poles are sometimes heard to hum when driven into oscillation by the wind. The speed of the waves on the power lines depend on the tension. What provides the tension in the power lines?

A train is moving past a crossing where cars are waiting for it to pass. While waiting, the driver of the lead car becomes sleepy and rests his head on the steering wheel, unintentionally activating the cars horn. A passenger in the back of the train hears the horns sound at a frequency of 428 Hz and a passenger in the front hears it at 402 Hz. Find (a) the trains speed and (b) the horns frequency, assuming the sound travels along the tracks.

Two trains on separate tracks move toward each other. Train 1 has a speed of 1.30 102 km/h; train 2, a speed of 90.0 km/h. Train 2 blows its horn, emitting a frequency of 5.00 102 Hz. What is the frequency heard by the engineer on train 1?

A source of sound vibrates with constant frequency. Rank the frequency of sound observed in the following cases from highest to the lowest. If two frequencies are equal, show their equality in your ranking. All the motions mentioned have the same speed, 25 m/s. (a) The source and observer are stationary. (b) The source is moving toward a stationary observer. (c) The source is moving away from a stationary observer. (d) The observer is moving toward a stationary source. (e) The observer is moving away from a stationary source.

Radio waves transmitted through empty space at the speed of light (v=c=3.00108m/s) by the Voyager spacecraft have a wavelength of 0.120 m. What is their frequency?

An interstate highway has been built through a neighborhood in a city. In the afternoon, the sound level in an apartment in the neighborhood is 80.0 dB as 100 cars pass outside the window every minute. Late at night, the traffic flow is only five cars per minute. What is the average late-night sound level?

At rest, a cars horn sounds the note A (440 Hz). The horn is sounded while the car is moving down the street. A bicyclist moving in the same direction with one-third the cars speed hears a frequency of 415 Hz. (a) Is the cyclist ahead of or behind the car? (b) What is the speed of the car?

An astronomer measures the speed of recession of a remote galaxy to be 365 km/s using the Doppler principle According to the Hubble relation, about how far away is the galaxy?

A stroboscope is set to flash every 8.00105s. What is the frequency of the flashes?