Problem 2.1P: Are the pressure in the tables absolute or gauge pressure? Problem 2.2P: What is the minimum pressure for liquid carbon dioxide? Problem 2.3P: When you skate on ice, a thin liquid film forms under the skate; why? Problem 2.4P: Is it possible to have water vapor at 5 ? Problem 2.5P: At higher elevations, as in mountains, air pressure is lower; how does that affect the cooking of... Problem 2.6P: Water at room temperature and room pressure has v110nm3/kg ; what is n? Problem 2.7P: Can a vapor exist below the triple point temperature? Problem 2.8P: Ice cubes can disappear and food can dry out (freezer burn) in the freezer. That happens to the ice? Problem 2.9P: In Example 2.lb, is there any mass at the indicated specific volume? Explain. Problem 2.10P Problem 2.11P: Locate the state of R410A at 500kPa,10C . Indicate in both the Pv and Tv diagrams the location of... Problem 2.12P: How does a constant-v process for an ideal an as appear in a PT diagram? Problem 2.13P Problem 2.14P: As the pressure of a gas becomes larger, Z becomes larger than 1. What does that imply? Problem 2.15P: Carbon dioxide at 280K can be in three different phases; vapor, liquid. and solid. Indicate the... Problem 2.16P: Find the lowest temperature at which it is possible to have water in the liquid phase. At what... Problem 2.17P: Water at 27C can exist in different phases, depending on the pressure. Give the approximate pressure... Problem 2.18P: Dry ice is the name of solid carbon dioxide. How cold must it be at atmospheric (100kPa) pressure?... Problem 2.19P: A substance is at 2MPa and 17C in a rigid tank. Using only the critical properties, can the phase of... Problem 2.20P: Determine the phase for each of these cases a. Water5C,100kPa b. Ammonia5C,100kPa c. R410A5C,700kPa... Problem 2.21P: Determine the phase of water at a. T260°C.P5MPa b. T=2C,P=100kPa Problem 2.22P: Determine the phase of the substance at the given state using appendix B tables. a. Water:... Problem 2.23P: Give the missing property of PvT and x for water at a. 10MPa,0.003m3/kg b. 1MPa,190C c.... Problem 2.24P: Determine whether refrigerant R410A in each of the following states is a compressed liquid, a... Problem 2.25P: Show the states in Problem 2.24 in a sketch of the Pv diagram. Determine whether refrigerant R-410A... Problem 2.26P: Fill out the following table for substance ammonia: Problem 2.27P: Place the two states ab listed in Problem 2.26 as labeled dots in a sketch of the Pv and Tv... Problem 2.28P: Determine the specific volume for R410A at these states: a. 15C,400kPa b. 20C,1500kPa c.... Problem 2.29P: Place the three states ac listed in previous problem as labeled dots in a sketch of the Pv and Tv... Problem 2.30P: Find P and x for CH4 at a. T=155K,v=0.04m3/kg b. T=250K,v=0.15m3/kg Problem 2.31P: Give the specific volume of carbon dioxide at 40C for 800kPa and for 1400kPa . Problem 2.32P: You want a pot of water to boil at 105C . How heavy a lid should you put on the 15cm -diameter pot... Problem 2.33P: Water at 400kPa a quality of 75 has its pressure raised 200kPa in a constant-volume process. What is... Problem 2.34P: Saturated water vapor at 200kPa is in a constant-pressure piston cylinder assembly. At this state... Problem 2.35P: Saturated liquid water at 60C is put under pressure to decrease the volume by 1 while keeping the... Problem 2.36P: A constant pressure piston cylinder has water at 1000kPa with a quality of 25 . Its temperature is... Problem 2.37P: A glass jar is filled with saturated water at 500kPa of quality 75 , and a tight Lid is put on. Now... Problem 2.38P: Saturated vapor R4l0A at 60C has to pressure decreased to increase the volume by 10 . while keeping... Problem 2.39P: Ammonia at 20C with a quality of 50 and a total mass of 2kg is in a rigid tank with an outlet valve... Problem 2.40P: Repeat the previous problem if the outlet valve is at the bottom taking saturated liquid out until... Problem 2.41P: R134a is in a sealed, rigid vessel of 2m3 as saturated vapor at 50C . It is now cooled to 20C . Find... Problem 2.42P: A storage tank holds methane at 120K , with a quality of 25 , and it warms up by 5C per hour due to... Problem 2.43P: A 400m3 storage tank is being constructed to hold liquified natural gas (LGN). which may be assumed... Problem 2.44P: Carbon dioxide at 6000kPa,40C is cooled in a closed rigid tank to -10C . At what temperature did it... Problem 2.45P: A pressure cooker has the lid screwed on tight. A small opening with A=5mm2 is covered with a... Problem 2.46P: A 1m3 tank is filled with a gas at room temperature (20C) and pressure (200kPa) . How much mass is... Problem 2.47P: A pneumatic cylinder (a piston cylinder with air) must close a door with a force of 500N . The... Problem 2.48P: Is it reasonable to assume that at the given states the substance behaves as an ideal gas? a. Oxygen... Problem 2.49P: Helium in a steel tank is at 250kPa,300K with a volume of 0.2m3 . It is used to fill a balloon. Then... Problem 2.50P: A spherical helium balloon l0m in diameter is at ambient T and P,15C and l00kPa . How much helium... Problem 2.51P: A glass is cleaned in hot water at 35°C and placed on the table bottom up. The room air at 20C that... Problem 2.52P: Air in a car tire is initially at 10C and 190kPa . After the car is driven awhile, the temperature... Problem 2.53P: A rigid tank of 1m3 contains nitrogen gas at 600kPa,400K . By mistake, someone lets 0.6kg flow out.... Problem 2.54P: Assume we have three states of saturated vapor R-134a at +40C,0C, and 40C . Calculate the specific... Problem 2.55P: Do Problem 2.54 for R-410A Assume we have three states of saturated vapor R-134a at +40C,0C, and 40C... Problem 2.56P: Do problem 2.54 for the substance ammonia. Assume we have three states of saturated vapor R-134a at... Problem 2.57P: A cy1inica1 gas tank 1m long, with an inside diameter of 20cm , is evacuated and then filled with... Problem 2.58P: Ammonia in a piston cylinder arrangement is at 700kPa and 80C . It is now cooled at constant... Problem 2.59P: Find the compressibility factor (Z) for saturated vapor ammonia at l00kPa and at 2000kPa . Problem 2.60P: Find the compressibility factor for methane at a. 8MPa,200K b. 8kPa,300K c. 150K,v=0.05m3/kg Problem 2.61P: Find the compressibility for carbon dioxide at 60C and 10MPa using Fig D.1. and repeat with Table... Problem 2.62P: What is the percent error in specific volume if the ideal gas model is used to represent the... Problem 2.63P: Estimate the saturation pressure of R142b at 300K . Problem 2.64P: A bottle a volume of 0.1m3 contains butane with a quality of 75 and a temperature of 300K . Estimate... Problem 2.65P: Find the volume of 2kg of ethylene at 270K,2500kPa using Z from Fig. D.l. Problem 2.66P: Argon is kept in a rigid 5m3 tank at 30C and 3MPa . Determine the mass using the compressibility... Problem 2.67P: A new refrigerant, R152a . is stored as a liquid at 20C with a small amount of vapor. For... Problem 2.68P: Determine the pressure of nitrogen at 160K,v=0.00291m3/kg using ideal gas, the van der Waals EOS,... Problem 2.69P: Determine the pressure of nitrogen at 160K,v=0.00291m3/kg using the Soave EOS and the nitrogen... Problem 2.70P: Carbon dioxide at 60C is pumped at a very high pressure. 10MPa , into an oil well to reduce the... Problem 2.71P: Solve Problem 2.70 using the Soave EOS. Notice that this becomes a trial-and-error process. Problem 2.72P: A tank contains 8.35kg of methane in 0.1m3 at 250K . Find the pressure using ideal gas, the van der... Problem 2.73P: Do the previous problem using the Redlich-Kwong EOS. Problem 2.74P: Do the Problem 2.72 using the Soave EOS. Problem 2.75P: Determine the unknowns of T, v and x if two phase of the following substances at the given four... Problem 2.76P: Give the phase and the missing properties of P, T, v, and x. These may be a little more difficult to... Problem 2.77P: Refrigerant R410A in a piston/cylinder arrangement is initially at l5C with x=1 . It is then... Problem 2.78P: Water in a piston cylinder is at 90C,100kPa , and the piston loading is such that pressure is... Problem 2.79P: A tank contains 2kg of saturated ammonia vapor at 70C . The tank is now cooled to 20C by heat... Problem 2.80P: A container with liquid nitrogen at l00K has a cross-sectional area of 0.5m2 , as shown in Fig.... Problem 2.81P: Determine the mass of methane gas stored in a 2m3 tank at 30C,2MPa . Estimate the percent error in... Problem 2.82P: What is the percent error in pressure if the ideal gas model is used to represent the behavior of... Problem 2.83P Problem 2.84P: Use a linear interpolation to estimate the missing properties of(P, T, y and x) for ammonia at a.... Problem 2.85P: Use a linear interpolation to estimate Tsat at 900kPa for nitrogen. Sketch by hand the curve Psat(T)... Problem 2.86P: Use a double linear interpolation to find the pressure for superheated R134a at 13C with v=0.3m3/kg... Problem 2.87EP: Cabbage needs to be cooked (boiled) at 250 F. What pressure should the pressure cooker be set for? Problem 2.88EP Problem 2.89EP: If I have 1ft3 of ammonia at 15psia,60F , what is the mass? Problem 2.90EP: Locate the state of R410A at 30 psia, 20F . Indicate in both the Pv and Tv diagrams the location of... Problem 2.91EP: A substance is at 300lbf/in.2,65F in a rigid tank. Using only the critical properties, can the phase... Problem 2.92EP: For water at 1 atm with a quality of 10 find the volume fraction of vapor. Problem 2.93EP: Determine the phase of the substance at the given state using Appendix F tables. a. Water:... Problem 2.94EP: Give the phase and the missing property of P, T, v, and x for R134a at a. T=10F,P=l8psia b.... Problem 2.95EP: Fill out the following table for substance ammonia. Place the two states ab as labeled dots in a... Problem 2.96EP: Give the phase and the specific volume for the following: a. R410A,T=25F,P=30lbf/in.2 b.... Problem 2.97EP: Give the missing property of P, T, v, and x for a. R410A,at80psia,v=0.2ft3/lbm b. R-410A at... Problem 2.98EP: Saturated liquid water at 150F is put under pressure to decrease the volume by 1 while keeping the... Problem 2.99EP: You want a pot of water to boil at 220F . How heavy a lid should you put on the 6-in-diameter pot... Problem 2.100EP: Saturated water vapor 240F has its pressure decreased to increase the volume by 10 , keeping the... Problem 2.101EP: Saturated vapor R4l0A at 100F has its pressure increased to decrease the volume by 20 while the... Problem 2.102EP: A glass jar is filled with saturated water at 300F and quality 25 , and a tight lid is put on. Now... Problem 2.103EP: A pressure cooker has the lid screwed on tight. A small opening with A=0.0075in.2 is covered with a... Problem 2.104EP Problem 2.105EP: Repeat the previous problem if the outlet valve is at the top taking saturated vapor out until no... Problem 2.106EP: A cylindrical gas tank 3ft long, with an inside diameter of 8in. , is evacuated and then filled with... Problem 2.107EP: A spherical helium balloon 30ft in diameter is at ambient T and P,60F and 14.69psia . How much... Problem 2.108EP: Helium in a steel tank s at 36psia , 540R with a volume of 4ft3 . It is used to fill a balloon. When... Problem 2.109EP: A 35ft3 rigid tank has propane at 25psia,540R and is connected by a valve to another tank of 20 ft3... Problem 2.110EP: What is the percent error in specific volume if the ideal gas model is used to represent the... Problem 2.111EP: Air in a car tire is initially at 10F and 30psia . After the car is driven awhile, the temperature... Problem 2.112EP: R4l0A at 200psia , 100F is cooled in a closed rigid tank to 30F . At what temperature did it become... Problem 2.113EP: Refrigerant- 410A in a piston cylinder arrangement is initially at 60F,x=1 . It is then expanded in... Problem 2.114EP: A substance is at 70F,300Ibf/in.2 in a 10ft3 tank. Estimate the mass from the compressibility chart... Problem 2.115EP: Estimate the saturation pressure of R142b at 540R . Problem 2.116EP: Determine the mass of an ethane gas stored in a 25ft3 tank at 250F,440lbf/in.2 using the... Problem 2.117EP: Determine the pressure of R410Aat100F,v=0.2ft3/ibm using ideal gas and the van der Waal EOS. Problem 2.118EP: What is the percent error in pressure if the ideal gas model is used to represent the behavior of... format_list_bulleted