0.8 kg water initially at 300 kPa and 250°C is contained in a piston-cylinder device fitted with stops (statel). The water is allowed to cool at constant pressure until one-half of the mass condenses and the piston just rests on the stops (state2). Then the water continues to cool until the pressure is 100 kPa (state3). (a) What is the phase of water at state 1, and why? (b) What is the phase of water at state 2, and specific volume v2? (Hint: think about if pressure changes from state 1 to state 2?) (c) What is the phase of water at state 3, and internal energy per unit mass u3? (Hint: think about if volume changes from state 2 to state 3?) Water 300 kPa 250°C Q (d) On the T-v diagram sketch with saturated lines, show the process paths passing through three states of the water.

2) Two glass bulbs, one on the left with a volume of 2 liters and the other on the right with avolume of 6 liters, are connected to one another by a thin tube that is initially closed by astopcock. The bulb on the left has 0.1 moles of ideal gas, and the bulb on the right isevacuated. The system is in thermal equilibrium with the surroundings at 300K. When thestopcock is opened, the gas flows out to fill both bulbs. Calculate A for this process. If wewere to insert a propeller to extract work as the gas flows from left to right, what is themaximum amount of work that we could possibly extract?

QUICKLY AND CORRECTLY PLEASE Two vessels A and B of different sizes are connected by a pipe with a valve. Vessel A contains 140 L of air at 3000 kPa, 90oC. Vessel B, of unknown volume, contains air at 70 kPa, 5oC. The valve is opened and, when the properties have been determined, it is found that pm = 1400 kPa, tm = 45oC. (a) What is the mass in kg of air initially inside vessel A (b) What is the volume of vessel B in liters?

d. A rigid vessel of volume 1 m3 contains steam at 20 bar and 400°c. The vessel is cooled until the steam is just dry saturated. i. Calculate the mass of steam in the vessel. ii. Determine the final pressure of the steam. ii. Determine the heat removed during the process.

A spring-loaded piston-cylinder device contains of m=1kg carbon dioxide. Initially, the spring has no force on the piston and P₁ = 500kPa, T₁ = 150K, V₁ = 0.1m³. Heat is transferred to the gas, causing the piston to rise and to compress the spring. At the state 2, T₁₂=900K, V₂=0.3m³. The gas is an ideal gas. (11) Calculate the heat transferred into the system in P1, V1, T1 P2, V2, T2 in kJ?

A spring-loaded piston-cylinder device contains  of m=1kg carbon dioxide. Initially, the spring has no force on the piston and  , , . Heat is transferred to the gas, causing the piston to rise and to compress the spring. At the state 2,  , . The gas is an ideal gas. (10)Which one is the  energy balance equation for this system?____________     A.     B.     C.     D.

In the boiler of a steam engine the superheated steam is at 500 degrees Celsius and 20 mPa is created by adding an amount of heat to the pressured water. Erros up to 10% have come up. Find the ideal gas law. Could the error seen in testing be due to the ideal gas law assumption? - value from the ideal gas law - value from tables - %Error Which of the above values is the most accurate? Could the error seen in testing be due to the ideal gas law assumption?

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5. A copper calorimeter can with mass 0.446 kg contains 0.0950 kg of ice. The system is initially at 0.0 C. (a) If 0.0350 kg of steam at 100.09C and 1.00 atm pressure is added to the can, what is the final temperature of the calorimeter can and its contents? (b) At the final temperature, how many kilograms are there of ice, how many of liquid water, and how many of steam? 6. The operating temperature of a tungsten filament in an incandescent light bulb is 2450 K, and its emissivity is 0.350. Find the surface area of the filament of a 150-W bulb if all the electrical energy consumed by the bulb is radiated by the filament as electromagnetic waves. (Only a fraction of the radiation appears as visible light.)