Which has a higher entropy, 1 kg of liquid water at 60°C or 1 kg of saturated water vapor at 40°C? a. water vapor at 40°C b.not possible to tell c. liquid water at 60°C
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- 10.-What is the heat of the isothermal process (from point B to point C)?50 GOA lab sample of gas is taken p through cycle abca shown in the p-V diagram of Fig. 18-43. The net work done is +1.2 J. Along path ab, the change in the internal energy is +3.0 J and the magnitude of the work done is 5.0 J. Along path ca, the energy trans- ferred to the gas as heat is +2.5 J. How much energy is transferred as heat along (a) path ab and (b) path bc? a b -V Figure 18-43 Problem 50.8) Derive the work expression involving volume and temperature for an isothermal monoatomic gas using the first Law.
- 27) Which of the following must be true for a thermodynamic process that starts and ends at the same state? A: The total heat and work for the cycle must both be zero B: The total work equals the heat C: The value of all state functions must be different at the beginning and the end of the process D: The change in internal energy over the whole cycle must equal 0 E: The temperature of the system will be constant throughout the process9.-What is the change in internal energy of the isochoric process (from point A to point B)?5
- 1) A gas undergoes a cycle in a piston-cylinder assembly consisting of the following three processes: Process 1-2: Constant pressure, p = 1.4 bar, V, = 0.028 m³, W12 = 10.5 kJ Process 2–3: Compression with pV = constant, U3 = U2 Process 3–1: Constant volume, U, - U3 = -26.4 kJ There are no significant changes in kinetic or potential energy. %3D %3D %3D a. Sketch the cycle on a p-V diagram. b. Calculate the net work for the cycle, in kJ. c. Calculate the heat transfer for process 1-2, in kJ.3- A gas is taken through the cyclic process described in the next Figure. (a) Find the net energy transferred to the system by heat during one complete cycle. (b) What If? If the cycle is reversed-that is, the process follows the path ACBA-what is the net energy input per cycle by heat? P(kPa) 8 B 6. 4 C V(m³) 10 6. 8.14. Suppose you expand an ideal gas adiabatically until its volume increases by 50%. By approximately what factor is the pressure reduced? (y = 5/3) a. 0.50 b. 0.35 C. 0.25 d. 0.70 e. 0.12