In the piston-cylinder assembly in the figure, the first 1 kg at a temperature of 110°C and a pressure of 600 kPa There is refrigerant-134a. Later on this refrigerant-134a is saturated vapor until cooled. Then, balance the piston the holding pin is removed and an additional force By applying refrigerant-134a, saturated liquid until it is compressed. phase changes showing the total work done in a P-v diagram calculate.

Initial condition: T = 360Ch = 1860.8 KJ/kg Process: IsometricFinal condition: saturatedRequired: Final pressure

3-28 Complete this table for H₂O. T, °C 140 80 P, kPa 200 950 500 800 h, kJ/kg 1800 3162.2 X 0.7 0.0 Phase description

Shown in the figure, an insulated rigid tank is divided into two equal parts by a partition. Initially, one part contains an indeal gas, and the other part is evacuated. The partition is then removed, and the gas expands into the entire tank. At the initial state, the mass of the gas is m= 4.00kg, initial pressure is p1 = 600.00 kPa, initial temperature is T1 = 300.00 K. The gas constant is R = 0.2870 kJ/(kg·K). (The internal energy can be determined by the equation ΔU=m·cv·(T2-T1), where cv =  0.7180 kJ/(kg·K) is the specific heat at the constant volume.)  Calculate the final state pressure p2.__________ (kPa)

An ideal gas is compressed from a volume of V, = 6.00 L to a volume of V, = 3.00 L while in thermal contact with a heat reservoir at T = 295 K as in the figure below. During the compression process, the piston moves down a distance of d = 0.145 m under the action of an average external force of F = 21.0 kN. (a) Find the work done on the gas. kJ (b) Find the change in internal energy of the gas. k) (c) Find the thermal energy exchanged between the gas and the reservoir. kJ (d) If the gas is thermally insulated so no thermal energy could be exchanged, what would happen to the temperature of the gas during the compression? O The temperature would decrease. O The temperature would remain constant. O The temperature would increase.