StackOfStrings s = new StackOfStrings(); while (!StdIn. isEmpty()) { String item = StdIn. readString(); if (!item. equals("-")) s. push(item); else if (s. isEmpty()) StdOut. println("BAD INPUT"); else StdOut. print(s. pop() + " "); }

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater