As shown in the figure below, a cylinder fitted with a piston is filled with 400 lb of saturated liquid ammonia at 25°F. The piston weighs 1 ton and has a diameter of 2.5 ft. Patm = 1 atm Piston Weight = 1 ton D=2.5 ft Ammonia Saturated liquid What is the volume occupied by the ammonia, in ft³? Ignoring friction, determine the force required, in lbf, by mechanical attachments, such as stops, to hold the piston in place.

Water undergoes two processes in series: • 1 to 2: isentropic (internally reversible and adiabatic) compression from 0.1 MPa and the phase of water is “saturated vapor” to 0.5 MPa• 2 to 3: a reversible isothermal process to 1.5 MPaa) Draw the overall process on a T-s diagram. Clearly indicate all states and the values of the relevant intensive properties on your diagram. b) Is process 2 to 3 a compression, expansion, or isochoric process? How do you know? c) Determine the overall specific work (w13) and specific heat transfer (q13) for this complete process. (Hint: recall that Q int rev =∫ T ds21 for an internally reversible process between states 1 and 2.)

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