18 21 Question 18 (3 points) A car moving at 20.0 m/s (about 45 mph) on a mountain road. The driver of the car beeps his

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18 21 Question 18 3 Points A Car Moving At 20 0 M S About 45 Mph On A Mountain Road The Driver Of The Car Beeps His 1 (45.95 KiB) Viewed 26 times

18 21 Question 18 (3 points) A car moving at 20.0 m/s (about 45 mph) on a mountain road. The driver of the car beeps his horn emitting a monotonic sound of frequency of 512 Hz. A third car right in front of the first car in the same lane moves at 25.0 m/s. What frequency does the driver in the third car hears? Let Vair = 343 m/s. Your Answer: Answer units Your Answer: 4 Question 19 (4 points) A car moving at 20.0 m/s (about 45 mph) on a mountain road. The driver of the car beeps his horn emitting a monotonic sound of frequency of 512 Hz. A fourth car is in the opposite lane driving towards the first car at 20.0 m/s. What frequency does the driver in the fourth car hears? Let Vair = 343 m/s.