A piston-cylinder device with a piston surface area of 0.1m^2 is initially filled with 0.05m^3 of air at the local atmospheric pressure and temperature, 100kPa and 20 degrees C, respectively. Now cold water is poured outside the cylinder, cooling the air temperature to 10 degrees C; however, the piston remains stuck at its inital position. Assume CPIG.
1. Find the friction force acting on the piston.
2. Find the heat transfer for the process.