The student pours 100 cm3 of hot water into a beaker. She places lid A on the beaker. This
leaves half of the water surface uncovered, as shown in Fig. 1.3.
She records the temperature of the water in the beaker and immediately starts a stopclock.
She records the temperature θ of the water every 30 s. Her readings are shown in Table 1.1.
She repeats the procedure using lid B. This leaves a quarter of the water surface uncovered,
as shown in Fig. 1.4
Complete the headings and the time t column in Table 1.1.
Table 1.1
|
beakerwithlidA
|
beakerwithlidB
|
t/
|
θ/
|
θ/
|
0
|
80.0
|
81.0
|
|
77.0
|
79.0
|
|
74.5
|
77.5
|
|
72.5
|
76.0
|
|
70.5
|
75.0
|
|
69.0
|
74.0
|
|
68.0
|
73.5
|