SpecialProblems14-16 - C while the other part has absolute...

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Special Problems for ME 200 – Fall 2009 Special Problems 14, 15, and 16 Due Friday, October 2, 2009 SP14: The pressure in an automobile tire depends on the temperature of air in the tire. On a day when the air temperature is 25 C, the pressure gage reads the tire pressure to be 210 kPa. The volume of the tire is known to be 0.025 m 3 . Assume that the atmospheric pressure is 100 kPa. (a) Determine the increase in the tire pressure (kPa) when the air temperature in the tire rises to 50 C. (b) How much air (kg) should be bled off so as to restore the pressure to its original value at 50 C? SP15: An insulated rigid tank is divided into two equal parts by a partition. Initially, one part contains 4 kg of CO 2 at 1.5 MPa and 227
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Unformatted text preview: C while the other part has absolute vacuum. The partition is removed so that the gas expands into the entire tank. (a) Can you treat CO 2 as an ideal gas at the initial condition? (b) Determine the final temperature ( C) in the tank. (c) What is the final pressure (kPa) in the tank? SP16: Steam is leaving a pressure cooker whose operating pressure is 30 psia. The amount of liquid inside the pressure cooker is found to decrease by 0.4 gallon in 45 minutes after steady operating conditions are established. The cross-sectional area of the exit opening is 0.15 in 2 . (a) What is the mass flow rate of the steam (lbm/hr) at the exit? (b) Calculate velocity of the steam (ft/s) at the exit....
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This note was uploaded on 05/15/2010 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue.

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