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1-ft3 of air is contained in the spring-loaded
Chapter 4, Problem 456E(choose chapter or problem)
1-ft3 of air is contained in the spring-loaded pistoncylinder device shown in Fig. P456E. The spring constant is 5 lbf/in, and the piston diameter is 10 in. When no force is exerted by the spring on the piston, the state of the air is 250 psia and 4608F. This device is now cooled until the volume is one-half its original size. Determine the change in the specific internal energy and enthalpy of the air.
Questions & Answers
QUESTION:
1-ft3 of air is contained in the spring-loaded pistoncylinder device shown in Fig. P456E. The spring constant is 5 lbf/in, and the piston diameter is 10 in. When no force is exerted by the spring on the piston, the state of the air is 250 psia and 4608F. This device is now cooled until the volume is one-half its original size. Determine the change in the specific internal energy and enthalpy of the air.
ANSWER:Step 1 of 7
A spring-loaded piston-cylinder device is filled with air. The air is now cooled until its volume decreases by 50%. The changes in the internal energy and enthalpy of the air are to be determined. We assume that under the specified conditions, air behaves as an ideal gas.
The gas constant of air is 
