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.

I want... third one..make it fast

A tank of compressed air is at 40°C and 10 atm. 1 third of the gas is removed for inflating a car tire. The tank is allowed to exchange heat with the surroundings to maintain its temperature at all times. What kind of a process is this? What is the pressure remaining in the tank? a. Sketch the problem. b.Draw lines identifying the control volume, or control mass. c.Identify the states with numbers, letters, or descriptions such as “in” and “out”. d.Write down the knowns and unknowns. e.Identify what is being asked for. f.State all assumptions.

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.

Question # 4  a) A rigid tank contains water vapor at 250 C and unknown pressure. When the tank is cooled to  124 C, the vapors start condensing. Find the initial pressure in the tank.  b) A piston–cylinder device initially contains 50 L of liquid water at 40°C and 200 kPa. Heat is  transferred to the water at constant pressure until the entire liquid is vaporized. i.What is the mass of the water?   ii.What is the final temperature?   iii. Determine the total enthalpy change.

Find the missing properties and give the phase of the substance. (a) H2O s = 1.75 Btu/lbm R, P = 4 lbf/in.2 h = ? T = ? x = ? (b) H2O u = 1350 Btu/lbm, P = 1500 lbf/in.2 T = ? x = ? s = ? (c) R-134a T = 30 F, P = 35 lbf/in.2, s = ? x = ? (d) R-134a T =10 F, x = 0.45 v = ? s = ? (e) NH3 T = 60 F, s = 1.35 Btu/lbm R u = ? x = ? Provide details with explanations of your work. Use appropriate property diagram(s) to assist in the understanding and solution of the problems. Summarize your results in a clearly annotated and labelled Table of Results.

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?