High School

At a depth of [tex]$x$[/tex] metres, the temperature of the water in an ocean is [tex]$T^{\circ} C$[/tex]. At depths below 900 metres, [tex]$T$[/tex] is inversely proportional to [tex]$x$[/tex].

[tex]$T$[/tex] is given by:

\[ T = \frac{4500}{x} \]

Work out the difference in the temperature of the water at a depth of 1200 metres and the temperature of the water at a depth of 3750 metres.

Answer :

To find the difference in temperature of the water at different depths, we follow the relationship given in the problem: the temperature [tex]\( T \)[/tex] is inversely proportional to the depth [tex]\( x \)[/tex]. This is represented by the formula:

[tex]\[ T = \frac{4500}{x} \][/tex]

Let's calculate the temperature at each specified depth and find their difference.

1. Calculate the temperature at a depth of 1200 meters:

Using the formula [tex]\( T = \frac{4500}{x} \)[/tex], substitute [tex]\( x = 1200 \)[/tex].

[tex]\[
T = \frac{4500}{1200} = 3.75^\circ C
\][/tex]

2. Calculate the temperature at a depth of 3750 meters:

Again using the formula, substitute [tex]\( x = 3750 \)[/tex].

[tex]\[
T = \frac{4500}{3750} = 1.2^\circ C
\][/tex]

3. Find the difference in temperature between the two depths:

Subtract the temperature at 3750 meters from the temperature at 1200 meters.

[tex]\[
\text{Difference} = 3.75 - 1.2 = 2.55^\circ C
\][/tex]

Therefore, the difference in the temperature of the water at a depth of 1200 meters and a depth of 3750 meters is [tex]\( 2.55^\circ C \)[/tex].