5. If a gas of volume 6000 cm³ and at pressure of 100 kPa is compressed quasi-statically according to PV² = constant until the volume becomes 2000 cm³, determine the final pressure and the work transfer.

(5)An insulated piston-cylinder device contains 15 L of saturated liquid water at a constant pressure of 950 kPa. Water is stirred by a paddle wheel while a current of 15 A flows for 28 min through a resistor placed in the water. If 64% of the liquid is evaporated during this constant pressure process and the paddle-wheel work amounts to 600 kJ, determine the voltage of the source. Also, show the process on a P-v diagram with respect to saturation lines. H,0 P= constant W. W.

given the enthalpy, H, is a natural function of entropy and pressure, write the expression fot he total differential of enthalpy

02: A gas is contained in a vertical frictionless piston - cylinder device. The piston has a mass of (4kg) and cross sectional area of (35 cm²). A compressed spring above the piston exerts a force of (60 N). If the atmospheric pressure is (95KPa), Determine the pressure inside the cylinder? Ans. (123.4 Kpa)

8. 1.8-m³ rigid tank contains steam at 220 °C. One-third of the volume is in the liquid phase and the rest is in the vapor form. Determine (a) the pressure of the steam, (b) the quality of the saturated mixture, and (c) the density of the mixture.

Air is contained in a vertical piston–cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 101.325 kPa on the top of the piston, which has a mass of 50 kg and a face area of 0.10 m 2 . Electric current passes through the resistor, and the volume of the air slowly increases by 2 ft3 while its pressure remains constant. The mass of the air is 0.32 kg, and its specific internal energy increases by 20 Btu/lb. The air and piston are at rest initially and finally. The piston–cylinder material is a ceramic composite and thus a good insulator. Friction between the piston and cylinder wall can be ignored, and the local acceleration of gravity is g = 32.0 ft/s2 Determine the heat transfer from the resistor to the air, in Btu, for a system consisting of (a) the air alone, (b) the air and the piston. Also draw the schematic diagram. Hint: Refer to example

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The work for irreversible compression of an ideal gas in a piston-cylinder system is the work for reversible compression to the same final pressure. a) higher than b) lower than c) the same as d) We need more information