1-m' tank containing air at 45°C and 500 kPa is connected through a valve to another tank containing 5 kg of air at 35°C and 250 kPa. Now the valve is opened, and the entire system is allowed to reach thermal equilibrium with the surroundings, which are at 24°C. Determine the volume of the second tank and the final equilibrium pressure of air.

3-39 Water initially at 200 kPa and 300°C is contained in a piston-cylinder device fitted with stops. The water is allowed to cool at constant pressure until it exists as a saturated vapor and the piston rests on the stops. Then the water continues to cool until the pressure is 100 kPa. On the T-v diagram, sketch, with respect to the saturation lines, the process curves pass- 1stams! od on TURNACE ing through the initial, intermediate, and final states of the 1992 palam 11. water. Label the T, P, and U values for end states on the process artita ne odrow OFTİ 21 nucfortyd beinvarian curves. Find the overall change in internal energy between the 1610 PRICE initial and final states per unit mass of water. al state Onimals uliod Anub 1516w 3-150 3-160 In Water 200 kPa 300°C 3-17C ment rises. Now on top of air Obs will rise in a co FIGURE P3-39 180 Q

Thermodynamic. Determine the work needed to compress from V1=30 lt to V2=5 lt a gas applying a constant pressure of 2.5atm.

A piston - cylinder device contains 1 kg air at a pressure P = 125 kPa and T= 500K. Now, the gas is started to be heated at constant pressure until its temperature reaches to T = 600 K Calculate the amount of heat delivered to the system in kj during this quasi-equilibrium process. Hint : Air at these conditions can be treated as ideal gas. Answer: