5.9. A rigid vessel of 0.06 m³ volume contains an ideal gas, Cy=(5/2)R, at 500 K and 1 bar. (a) If heat in the amount of 15,000 J is transferred to the gas, determine its entropy change. (b) If the vessel is fitted with a stirrer that is rotated by a shaft so that work in the amount of 15,000 J is done on the gas, what is the entropy change of the gas if the process is adiabatic? What is AStotal? What is the irreversible feature of the process?

Gas enters a turbine at 200 mol/s, pressure at 100 bar and specific volume at 400 cm3/mol. The gas is polytropic with the following the behavior: PV1.5 constant. How much power is generated by the turbine when the gas leaves at 6 bar?

PROBLEM 3 Saturated water vapor at 100 kPa is in a piston-cylinder device. At the initial state the piston is 0.2 m from the cylinder bottom. The water vapor is heated in a constant pressure process until the cylinder volume is doubled. Sketch this process on P-v and T-v diagrams. Find the final distance from the piston to the cylinder bottom and the final temperature.

For a refrigerator designed to work stably, reversible as shown. Prove that the energy efficiency factor of this refrigerator is:

Answer please!!

7.1. Air expands adiabatically through a nozzle from a negligible initial velocity to a final velocity of 325 ms. What is the temperature drop of the air, if air is assumed to be an ideal gas for which Cp = (7/2)R?

in a closed system process, 600 Btu of heat is added to the system, and the internal energy of the system increases by 220 btu. calculate the work of the process

A steam turbine takes in super-heated steam at 2,000 kPa and 300 Celsius discharges at 50 kPa. What is the maximum theoretical work production in kJ/kg? What is the outlet temperature in Celsius?

(a) Derive the change in the entropy for adiabatic reversible expansion of a diatomic ideal gas from V₁ to V₁, starting with the Tinitial temperature (neglect the temperature dependence of the heat capacity). (b) Verify that the same entropy change is obtained if the gas is first expanded reversibly and isothermally the final volume followed by (reversible) cooling at constant V.

A 1 m diameter cylinder, 1 m long, is maintained at 800 K and has an emissivity of 0.65. Another cylinder, 2 m in diameter and 1 m long, encloses the first cylinder and is perfectly insulated. Both cylinders are placed in a large room maintained at 300 K. Calculate the heat lost by the inner cylinder.