A ship 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?

Respuesta :

Answer: 3752 m

Explanation:

The speed of sound  in the air, at [tex]0 \°C[/tex] is [tex]331.5 m/s[/tex], and for each degree Celsius the temperature rises, the speed of the sound increases by [tex]0.6 m/s[/tex]. So, if we estimate the speed of sound at [tex]16 \°C[/tex] it will be [tex]341.1 m/s[/tex].

On the other hand, the speed of sound [tex]V[/tex] is defined as the distance traveled [tex]d[/tex] in a especific time [tex]t[/tex]:

[tex]V=\frac{d}{t}[/tex]

Where:

[tex]V=341.1 m/s[/tex] is the speed of sound

[tex]t=\frac{22 s}{2}=11 s[/tex] is half the time the sound wave travels from the ship and then returns from the coastal land

[tex]d[/tex] is the distance between the ship and the coastal land

[tex]341.1 m/s=\frac{d}{11 s}[/tex]

Finding [tex]d[/tex]:

[tex]d=(341.1 m/s)(11 s)[/tex]

Finally:

[tex]d=3752.1 m[/tex]