
In a series of experiment, block B is to be placed in a thermally insulated container with block A, which has the same mass as block B. In each experiment, block B is initially at a certain temperature TB, but temperature TA of block A is changed front experiment to experiment. Let Tf represent the final temperature of the two blocks when they reach thermal equilibrium in any of the experiments. Figure 18-53 gives temperature Tf versus the initial temperature TA for a range of possible values of TA, from TA1 = 0 K to TA2= 500 K. The vertical axis scale is set by Tfs = 400 K. What are (a) temperature TB and (b) the ratio cB/cA of the specific heats of the blocks?
Figure 18-53 Problem 74.

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