Problem 1:
A rigid tank contains 5 kg of refrigerant 134a. initially at 20°C and 140 kPa. The refrigerant is now cooled while being stirred until its pressure drops to 100 kPa. Determine the entropy change of the refrigerant during this process.
Problem 2:
Consider the two-fluid manometer shown in the figure. Calculate the applied pressure difference P1 - P2. The specific gravity of carbon tetrachloride is SGet= (density of carbon tetrachloride)/(density of water) = 1.595.