Aship at sea sounds a whistle blast, and an echo returns from the coastal land 22.0 s later. how many km is it to the coastal land if the air temperature is 16.8°c?

3752 m

Explanation:

The speed of sound  in the air, at is , and for each degree Celsius the temperature rises, the speed of the sound increases by . So, if we estimate the speed of sound at it will be .

On the other hand, the speed of sound is defined as the distance traveled in a especific time :

Where:

is the speed of sound

is half the time the sound wave travels from the ship and then returns from the coastal land

is the distance between the ship and the coastal land

Finding :

Finally:

true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.