Awoman is sitting at a bus stop when an ambulance with a siren wailing at 317 hz approaches at 69 miles per hour (mph). assume the speed of sound to be 343 m/s. a) how fast is the ambulance moving in meters per second? (perform the necessary unit conversion) vs= 69 mph = m/s b) what frequency does the woman hear? fa = hz c) what speed (vs) would the ambulance be traveling in order for the woman to hear the siren at an approaching frequency of 350 hz? vs= m/s d) what frequency would she hear as the siren moves away from her at the same speed (as in part c)? fa = hz

a) 30.84m/s

b) 348.32Hz

c) 32.34m/s

d) 289.69Hz

Explanation:

a) If 1 mile=1609,34m, and 1 hour=3600 seconds, then 69mph=69*1609.34m/3600s=30.84m/s

b) Based on Doppler effect:

/*I will take as positive direction the vector */

c)

d)

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

answer; equivalent to a one(1) horsepower motor;