Answer Happy

Please help me answer this question! I have tried 411.212 as well
You have decided to combine your musical ability, your physics knowledge, and your app-designing ability to make some money at the racetrack betting with your friends. You bet your friends that you can determine the speed of a race car by humming into your smartphone. You have noticed that race cars exhibit the Doppler effect when they race past you as you stand next to the track. You have also found that you can hum relatively accurately the typical frequencies that the engine of a race car makes as it approaches you and recedes from you. You create an app on your smartphone that will listen to you humming those two frequencies and then perform a calculation of the speed of the car. When you perform this activity with your friends, they are amazed! (Assume that the speed of sound is 343 m/s.) (a) Determine the equation that your app must use to calculate the speed of the race car from the input of the two frequencies described. f' -f +f O away toward y toward away f'toward-fa away y ftoward away f _f' away toward y away toward +f' toward away.v toward-f away (b) If the frequencies you hum are 422 Hz for the approaching car and 255 Hz for the receding car, find its speed in mi/h. 189.267 mi/h (c) If the frequency of the race car drops by exactly an octave as it passes by, find the speed of the car (in mi/h). (Note: A musical octave is a frequency ratio of 2.) 565.876 X Evaluate the equation in part (a) for a frequency ratio corresponding to an octave. mi/h