20.A 30 kg iron was put in a container with water. The water is at 10°C and the iron has an initial temperature of 439•K until the iron was in thermal equilibrium with water. Find the change in...

Extracted text: 20.A 30 kg iron was put in a container with water. The water is at 10°C and the iron has an initial temperature of 439•K until the iron was in thermal equilibrium with water. Find the change in entropy. (Cp = 0.4 kJ/kg-K) %3D


Extracted text: 21.A perfect gas has a value of R = 58.8 lbf-ft/lb-R and k = 1.26. If 20 Btu are added to 5lb of this gas at constant volume when the initial temperature is 90°F. Find T2, AH, AS, AU, and work for non - flow process.