Enter the temperature in Table 3.1, rounded to the nearest 0.5^{\circ}C.
Fill in the time t column.
Suggest why the student waits for 30 s before measuring the initial temperature of the hot water.
State how the student keeps the temperature readings as accurate as possible.
Calculate the decrease in temperature $\Delta \theta$ of the hot water during the first two minutes of cooling.
Calculate the average rate of cooling R1 of the hot water during the first two minutes of cooling. Use the equation: $R_1 = \frac{\text{decrease in temperature}}{\text{time}}$. Give the unit in your answer.
Calculate the average rate of cooling R2 of the hot water in the final two minutes of cooling.
Use your answers in (c)(ii) and (c)(iii) to write a conclusion about how hot water in a beaker cools.
Estimate the temperature of the water \theta5 after another 5 minutes of cooling.
Estimate the temperature of the water \theta50 after another 50 minutes of cooling.