State the temperature at time $t = 0$, rounded to the nearest $0.5^\circ\text{C}$.
Explain why the student delays for $30\,\text{s}$ before taking the initial temperature of the hot water.
Calculate the average rate of cooling $P_T$ for the hot water at the top of the beaker by using $\text{average rate of cooling} = \frac{\text{decrease in temperature of the water}}{\text{time taken}}$. Give your answer to $2$ significant figures and state the unit.
Using the data in Table 2.1, calculate the average rate of cooling $P_B$ for the hot water at the bottom of the beaker.
Use your answers to (b)(i) and (b)(ii) to suggest why a hot liquid ought to be stirred before its temperature is measured.
State one feature of the apparatus arrangement in this experiment that helps the thermometer to be read accurately.
Suggest one variable that should remain constant when the experiment is repeated to check the results.
Predict the temperature of the water in the beaker after $30$ minutes.