Answer:
We see a bolt of lightning and 4 seconds later we hear the thunder. If the speed of sound in air is 0.2 miles per second, how far way is the lightning? (0.8 miles)
You look up and see a helicopter passing directly overhead. Approximately 3.10 seconds later you hear the sound of the blades. If the air temperature is 23°C how high was the helicopter flying? (1070 m)
A person is listening for an oncoming train with his ear pressed against the steel rail. When the train is 1.65 km away, how long will it take the sound of the train to reach his ear? (note: the speed of sound in steel is approximately 5,200 m/s.) (0.32 s)
(B)Suppose his friend is standing next to him. How long will it take him to hear the sound of the train if the air is 0°C? (5.0 s)
A sonar unit on a submarine sends out a pulse of sound into seawater. The pulse returns 0.87 s later. What is the distance to the object that reflects the pulse back to the submarine? The speed of sound in seawater is 1470 m/s. (639.5 m)
A rifle is fired in a valley with parallel vertical walls (and room temperature air). The echo from one wall is heard 2s after the rifle was fired. The echo from the other wall is heard 2s after the first echo. How wide is the valley? (1029 m)
If a ship captain sounds a foghorn toward an iceberg and hears the echo 4.6 seconds later, how far way is the iceberg if the air is -10°C? (Be careful….you don’t want to end up like Rose and Jack floating on a door in the freezing waters of the north Atlantic! We all remember how that turned out for Jack.) (750 m)
Explanation:hope it helps
