A nonflow, cylinder-piston apparatus contains 0.5 lbm of a gas. If 10 Btu is supplied as work to compress the gas as its temperature increases from 70°F to 150°F, determine the energy interchange as heat. For the gas, cv can be taken as 0.22 Btu/ lbm·°R.
2. A nonflow system undergoes a process in which 42 kJ of heat is rejected. If the pressure is kept constant at 125 kPa while the volume changes from 0.20 to 0.06 m3, determine the work done and the change in internal energy.
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