A piston-cylinder device, containing air at 255 kPa, loses heat to the surrounding atmosphere at a rate of 0.65 kW. At a given instant, the piston, which has a cross-sectional area of 0.020 m2, moves down with a velocity of 1 cm/s. Determine the rate of change of stored energy in the gas? +

Steam at a pressure of 11 bar and a temperature of 320C is containedin a large vessel. Connected to the vessel through a valve is a turbinefollowed by a small initially evacuated tank with a volume of 0.60 m3.When emergency power is required, the valve is opened and the tankfills with steam until the pressure is 11 bar. The temperature in the tankis then 400C. The filling process takes place adiabatically and kineticand potential energy effects are negligible. Determine the amount ofwork developed by the turbine in kJ.

169 g of solid water (i.e. ice), at -17 °C, is placed into a sealed, insulated container with a volume of 0.29 m^3. A 1457 W heater is used to heat and change the phase of the sample until it is a gaseous water (i.e. steam). The heater runs for 433 s. What is the pressure, in kPa, of the gaseous water in the container at the end of the heating process? Round your answer to the first decimal place.

QUESTION 1 (a) The air inside a 0.2 m² piston-cylinder device initially at 600 kPa. After heated up for 5 minutes, the air pressure increases to 1200 kPa, while maintaining the same volume due to installation of stopper in the piston-cylinder. i. ii. iii. Calculate the boundary work experienced by this piston-cylinder device, kJ. Name the thermodynamics process. In the other case, if there is no stopper in the cylinder, the air inside the piston-cylinder device is allowed to expand to 0.35m' under isobaric condition of 600 kPa. Calculate the boundary work, kJ.