A 364 g block is put in contact with a thermal reservoir. The block is initially at a lower temperature than the reservoir. Assume that the consequent transfer of energy as heat from the reservoir to the block is reversible. Figure 20-22 gives the change in entropy S of the block until thermal equilibrium is reached. The scale of the horizontal axis is set by Ta  280 K and Tb  380 K. What is the specific heat of the block?