Water vapor initially at 3.0 MPa and 300ºC (state 1) is contained within a piston-cylinder device. The water is cooled at constant volume until its temperature reaches 200ºC (state 2). The water is then compressed isothermally to a state where the pressure is 2.5 MPa (state 3). Sketch this process on T-v and P-v diagrams and determine the specific volume at all three states and the quality at state 2.

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.