Special Problems for ME 200 – Spring 2012
Special Problems SP5, SP6, and SP7
Due Friday, January 27, 2012
SP5:
A 25kg piston in the pistoncylinder system shown in
Figure SP 5 is initially at rest on the bottom stops and
the gas inside the cylinder has an initial pressure of 70
kPa and an initial temperature of 10
o
C (State 1).
The gas
inside the cylinder is heated until the piston just leaves
the bottom stops (State 2).
Additional heat is added to
the cylinder until the piston just hits the top stops (State
3).
The pressure surrounding the cylinder is 101 kPa and
the volume of the stops and the piston can be neglected.
The gas inside the cylinder can be considered an ideal
gas, pV = mRT, where p = pressure, V = volume, m =
mass of the gas, R is a constant and T = absolute
temperature of the gas.
Figure SP5
(a) Calculate the work in going from State 1 to State 2, in kJ.
(b) Find the work in going from State 2 to State 3, in kJ.
(c) Determine the temperature at State 2, in K.
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 Spring '08
 GAL
 Thermodynamics, Energy, Heat, PV diagram

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