An aluminum alloy that has been solutionized at 500°c and quenched rapidly to room temperature and immediately aged at 120oc that the precipitation rate is several orders of magnitude faster than the same aluminum alloy that has been solutionized and quenched from 500°c, held at room temperature for a month, and then aged at 120oc. explain this behavior

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