Use the adiabatic pressure vs. volume relation to find a change in pressure and the work done on a gas.

A rigid closed tank contains refrigerant 134a wnich is initially with a temperaf lure of D'C and a quality Of Ce0% . An electrical resistor inistalled inside the Fank transfers heat energy to the refrigerant at a rate Of 2 kW until the tånk contains only saturated vapor. if the tank is well - insulated and the mass Of the refrigerant is 1.5 kg, determine the time it takes for the process to be completed in seconds using 5 signifigant figures. a two- phase liquid - vapor muture

4.9 A piston/cylinder contains 50 kg of water at 200 kPa with a volume of 0.1 m³. Stops in the cylinder restrict the enclosed volume to 0.5 m³, similar to the setup in Problem 4.7. The water is now heated to 200°C. Find the final pressure, volume, and work done by the water. H₂O FIGURE P4.9

A spring-loaded piston-cylinder device contains  of m=1kg carbon dioxide. Initially, the spring has no force on the piston and  , , . Heat is transferred to the gas, causing the piston to rise and to compress the spring. At the state 2,  , . The gas is an ideal gas. (7)How to calculate the total boundary work ?_____     A.     B.     C.     D.