A vertical piston/cylinder device contains 0.01 lbm of gas. The gas has an initial volume of 0.18 ft3 and initial specific internal energy of 282 Btu/lbm. The piston, with a mass of 110 lbm and cross-sectional area of 0.11 ft2 , is in equillibrium with the gas. The outside ambient pressure is 14.7 psia. The gas now undergoes a process in which the volume increases to 0.4 ft3 . The final specific internal energy is 316 Btu/lbm. Assume a quasi-equillibrium process in which piston movement is slow with no acceleration. Friction between the piston and cylinder is negligible. a. Determine work [Btu] during the process (magnitude and direction)
b. Determine heat transfer [Btu] during the process (magnitude and direction)