Question

Kareem heats a beaker of water to a boil. Then he records that the water temperature decreases from 100 degrees Celsius to 19 degrees In 5 2/5 minutes. What was the change in temperature each minute?

Answer 1

It is given that,

The temperature decreases from 100 degrees Celsius to 19 degrees in 5 2/5 minutes.

To find the change in temperature each minute:

Let us take,

$\begin{gathered} T_1=100 \\ T_2=19 \\ t=5\frac{2}{5} \\ =\frac{27}{5} \\ =5.4 \end{gathered}$

Using the formula,

$\frac{T_1-T_2}{t}$

We get,

$\begin{gathered} \frac{100-19}{5.4}=\frac{81}{5.4} \\ =15 \end{gathered}$

Hence, the change in temperature each minute is 15 degree celcius per minute.