A train is traveling at 12.3 m/s as it approaches a tunnel in the smooth, vertical face of a rock cliff. The speed of sound is 343. m/s. The engineer sounds a whistle in the locomotive of fundamental frequency 325. Hz. (a) At what frequency does a rider in the caboose hear the locomotive whistle? (b) Suppose that a rock climber is on the cliff face, just above the tunnel. At what frequency would the cliff-based observer hear the locomotive whistle? (c) At what frequency does the rider in the caboose hear the echo from the cliff wall?

A hiker shouts towards a vertical cliff that is 465 m away. The echo is heard 2.75 s later. What is the speed of sound of the hiker's voice in air?

You are driving down the highway at a speed of 45 m/s when you hear the sound of a police siren that is 200 m behind you. The frequency you hear is 450 Hz. You know, however, that the actual frequency of a police siren is 425 Hz. What is the speed of the police car? Assume the speed of sound is 343 m/s.

While running on the sidewalk at 5.2m/s , you hear an ambulance approaching you from behind. It is traveling at 27.8m/s with respect to the road. If the ambulance has a siren with a frequency of 2.30x10°Hz and the speed of sound is 343m/s , at what frequency do you hear the siren?

An osprey’s call is a distinct whistle at 2200 Hz. An osprey calls while diving at you, to drive you away from her nest. You hear the call at 2300 Hz. How fast is the osprey approaching?

You are moving at 20 m/s. A police car with a siren blasting is first behind you and overtaking you. You hear a frequency of 800 HZ. He passes you (lucky you!) and you now hear a frequency of 680 HZ. How fast is the police car moving?

105 joules How much net work is required to accelerate a 1000-kg car from 20 m/s to 30 m/s?