Answer Happy

Question 16 (5 points) Earthquakes are known to generate two types of waves, P-waves and S waves. Typically, a P-wave travels at 6.00 km/s and an S-wave at 4.00 km/s. If the center of an earthquake occurs at 8400 km away from a seismic station, how much earlier (in sec) does the P-wave arrive at the seismic station than the S-wave? Your Answer: Answer Question 17 (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 second car immediately behind the first car in the same lane moves at 17.0 m/s. What frequency does the driver in the second car hears? Let Vair = 343 m/s. Your Answer: units Answer units 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.