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The speed of sound in steel is about 4.5 km/s. A steel rail is struck with a hammer, and an observer 0.40 km away has one ear to the rail.
(a) How much time will elapse from the time the sound is heard through the rail until the time it is heard through the air? Assume that the air temperature is 20°C and that no wind is blowing.
(b) How much time would elapse if the wind were blowing toward the observer at 43 km/h from where the rail was struck?
A sailor strikes the side of his ship just below the waterline. He hears the echo of the sound reflected from the ocean floor directly below 2.7 s later. How deep is the ocean at this point?
Assume the speed of sound in seawater is 1560 m/s (Table 12-1) and does not vary significantly with depth.
how to do these is 10 points
(a) How much time will elapse from the time the sound is heard through the rail until the time it is heard through the air? Assume that the air temperature is 20°C and that no wind is blowing.
(b) How much time would elapse if the wind were blowing toward the observer at 43 km/h from where the rail was struck?
A sailor strikes the side of his ship just below the waterline. He hears the echo of the sound reflected from the ocean floor directly below 2.7 s later. How deep is the ocean at this point?
Assume the speed of sound in seawater is 1560 m/s (Table 12-1) and does not vary significantly with depth.
how to do these is 10 points