Fig. 5.1 depicts two metal blocks, A and B, which are equal in size and constructed from the same material. Block A has a dull black surface, while block B has a shiny white surface. Both blocks start at 80^{\circ}C. Fig. 5.2 gives the cooling curve for block A.
(a(i))[1]
From Fig. 5.2, find how much the temperature of block A changes from 0 to 2 min.
(a(ii))[1]
Determine the final temperature of block A.
(a(iii))[1]
Explain why block A ends with a steady final temperature.
(b(i))[3]
Predict the cooling curve for block B by sketching a line on the graph in Fig. 5.2.
(b(ii))[1]
Explain why the results for block B are slightly different from the results for block A.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “25 ^{\circ}C ” …