Do the same work as in Problem II.3 for the stirred tank heaters' system shown in Figure PII.4. For tank 1, the steam is injected directly in the liquid water. Water vapor is produced in the second tank. A1 and A2 are the cross-sectional areas of the two tanks. Assume that the effluent flow rates are proportional to the liquid static pressure that causes their flow. At is the heat transfer area for the steam coil. (a) Identify the state variables of the system. (b) Determine what balances you should perform. (c) Develop the state model that describes the dynamic behavior of the system. Figure PII.4