Apiston-cylinder device with 12 kg of steam is cooled from heated from a temperature and pressure of 250 °c and 500 kpa until it is a saturated vapor. the weight of the piston is supported by the pressure of the steam and moves as the temperature increases. what is the work done on the steam in this process?

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

An engine runs on the ideal diesel cycle. the cycle has a compression ratio of 20 and a cutoff ratio of 2. the highest temperature in the cycle is 1200 k. if the heat into the system is 300 kj/kg of working fluid and using variable specific heats determine the work produced per mass of working fluid

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false