The air in a piston-cylinder device is expanded from the original volume of 1 m to 2 mở in a constant pressure process, at P=100 Pa. The boundary work performed by the system on the surrounding is Joules.

A closed system of constant volume experiences a temperature rise of 20 ⁰C when a certainprocess occurs. The heat transferred in the process is 18 kJ. The specific heat at constantvolume for the pure substance is 1.2 kJkg-1K-1, and the system contains 2 kg of this substance.Determine the change in internal energy and the work done.

Refrigerant 134a expands in a piston-cylinder assembly from p₁= 200 lb/in² and T₁ = 140°F to p₂ = 30 lb/in² and T₂ = 80 °F. The mass of refrigerant is 0.46 lb. During the process, the work done by the refrigerant is 4.32 Btu. Kinetic and potential energy effects are negligible. Determine the initial volume of the refrigerant, V₁, in ft³, and the heat transfer for the process, in Btu. Step 1 * Your answer is incorrect. Determine the initial volume of the refrigerant, V₁, in ft³. V₁= 0.105743 ft3

Calculate the work associated with a system when its volume is compressed from 81.6 L to 30.9 L against a constant pressure of 1.23 bar. Express your final answer in J and 2 significant figures

Air in a closed-piston cylinder is initially at 100 kPa and 27°C. It is then compressed until the pressure reaches 2 MPa in a polytropic process with n = 1.3. Determine how much boundary work in kJ/kg must be supplied into the system to make this process possible. Round your answer to the nearest whole number.