An eagle flying at 28 m/s emits a cry whose frequency is 370 Hz. and speed is 11 m/s. A blackbird is moving in the same direction as the eagle at 10.78 m/s. (Assume the speed of sound is 343 m/s). what frequency does the blackbird hear (in Hz) after the eagle passes the blackbird?

A bungee jumper jumps from rest and screams with a frequency of 403 Hz. The air temperature is 20 °C. What is the frequency heard by the people on the ground below when she has fallen a distance of 14.3 m? Assume that the bungee cord has not yet taken effect, so she is in free-fall. Number Units

Standing at a crosswalk, you hear a frequency of 590 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 501 Hz. Determine the ambulance's speed from these observations. (Take the speed of sound to be 343 m/s.) m/s

One day when the speed of sound in air is 343 m/s, a fire truck traveling at vs = 25 m/s has a siren which produces a frequency of fs = 424 Hz. vS = 25 m/s f = 424 Hz What frequency (in Hertz) does the driver of the truck hear?  What frequency (in Hertz) does an observer hear when the truck is moving away?

A bystander hears a siren vary in frequency from 590 Hz to 368 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.)

A fire engine siren emits sound at 1260 Hz. The fire engine is driving down the street toward you at 29 m/s. (The speed of sound in air is 343 m/s.) What frequency sound do you hear? What frequency sound do you hear after the fire engine passes you?

While sitting next to a road on a calm, warm 27.9ºC evening, you see an ambulance's lights flashing in the distance coming towards you. You hear a frequency of 150 Hz (you have a very keen ear!). However, you know that ambulances have sirens that emit sound at 140 Hz. How fast is the ambulance approaching you, in m/s

A passenger on a train approaching a station a 29 m/s hears a bell ringing in the station. Take the speed of sound to be 343 m/s.   the passenger hears a bell at a frequency of 361 Hz. What frequency, in hertz, do the people waiting on the station platform hear?

On a warm summer day (32 degrees C), it takes 4.80 s for an echo to return from a cliff across a lake. On a winter day, it takes 5.20 s. The speed of sound in air is vAc (331 + 0.60T)m/s, where T is the temperature in degrees C. What is the temperature on the winter day?

Standing at a crosswalk, you hear a frequency of 520 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 436 Hz. Determine the ambulance's speed from these observations. (Take the speed of sound to be 343 m/s.) m/s