An insulated piston-cylinder device contains steam at 300 kPa, 200oC, occupying a volume of 1 m3, and having a specific volume of 0.716 m3/kg. It is heated by an internal electrical heater until the volume of steam doubles due to an increase in temperature.
(a) Determine the final specific volume of steam.
(b) If the diameter of the piston is 20 cm and the outside pressure is 100 kPa, determine the mass of the weight placed on the piston to maintain a 300 kPa internal pressure.
(c) Calculate the WB (magnitude only) done by the steam in kJ.
(d) Calculate the amount of WM (magnitude only) transferred into the weight in kJ.
(e) If you are asked to choose one of the three values - 1300 kJ, 300 kJ, 200 kJ - as the magnitude of Wel, which one will be your educated guess? Why?