An emergency vehicle blowing its siren is moving away from you with a speed of 23 m/s. The sound you
hear has a frequency of 590 Hz. What is the frequency
produced by the siren?

Which type of circuit is becoming more common in residential electrical design and construction? a. hazardous-area circuit b. three-phase circuit c. 480-volt circuit d. communication circuit

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?