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nothingkwt
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Homework Statement
0.03m^3 of air is contained in the spring-loaded piston-cylinder device. The spring constant is 875N/m and the piston diameter is 25cm. When no force is exerted by the spring on the piston the state of the air is 2250kPa and 240C. This device is now cooled until the volume is halved. Determine the change in internal energy and specific enthalpy.
Homework Equations
du=Cv(T2-T1)
dh=Cp(T2-T1)
Pv=RT
P2A = PatmA - F spring
The Attempt at a Solution
I'm having trouble getting the P2.
Homework Statement
Homework Equations
http://imgur.com/sRT21x6
http://minus.com/lE1w4b9sdcKqd
The Attempt at a Solution
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