A 0.4m^3 tank contains oxygen initially at 120-bar and 30C. A paddlewheel within the tank is rotated until the pressure inside rises to 184bar. During the process 20kJ of heat is lost to the surroundings. Determine the absolute value of paddlewheel work. For oxygen, assume a constant specific heat capacity of cv = 0.658kJ/kg^-1/K^-1 and R = 0.2598 kJ/kg^-1/K^-1

A piston-cylinder device initially contains 0.4 m^3 of saturated water vapor at a pressure of 200 kPa.  At this time, a linear spring (K = 150 N/m) is touching the piston, but exerts no force upon it.  Heat is now transferred to the water vapor for 30 minutes through a resistive heater having a current of 10 amperes.  The pressure and volume rise to 300 kPa and  0.6 m^3 while the system lost 10 kJ of heat during this process.  Determine the voltage of the resistive heater and draw the provess on a P-v diagram with respect to saturation lines.  Show detailed calculations and specify any required values found on thermodynamic tables.

A rigid tank of volume 10 m³ initially contains saturated water vapor at a temperature of 120 °C. Steam at a pressure 1.2 MPa and a temperature of 400 °C enters the tank through a valve in steam line that is connected to the tank until the final pressure in the tank is 800 kPa, at which time the temperature is 200 °C. All kinetic and potential energy effects can be neglected. A schematic of the problem and properties at all state points except state 1 are shown in the figure below. All of the properties at state 2 and the inlet state i are provided on the figure. Initial State in Tank T₁-120 °C, Sat. vapor u₁=? kJ/kg V₁=? m³/kg Pi=1.2 MPa, Ti-400 °C hi-3261.3 kJ/kg V=10 m³ Final State in Tank T: 200 °C, P₂-800 kPa u₂= 2631.1 kJ/kg v₂=0.26088 m³/kg Qout For Question 6: The initial specific internal energy, u1, of the saturated vapor in the tank in kJ/kg is