9. When a gas expands slowly from V1 to V2, the work done W by the system is and represented by the shaded area under the pV curve (True or False). A. Negative; True. B. Negative; False. C. Positive; True D. Positive; False
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9. When a gas expands slowly from V1 to V2, the work done W by the system is
___________ and represented by the shaded area under the pV curve (True or
False).
A. Negative; True.
B. Negative; False.
C. Positive; True
D. Positive; False
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- 1. An ideal gas at initial pressure PF4PA and temperature T=200K expands isothermally to 3 times its original volume. The gas is then further reduced in pressure at constant volume to pf1Pa. What is the final temperature of the gas, Tf? (hint: draw the multi-step process on a pV diagram.) А. 35K В. 150K С. 200K D. 300K E. 600KA sample of an ideal gas goes through a full cycle, returning to the same pressureand volume. It does this by undergoing a. an isobaric expansion,b. a constant-volume reduction in temperature,c. and then an isothermal process back to its initial state. Draw the pV-diagram for this full cycle.7. Figure 3 shows the expansion of an ideal gas from initial volume V; = 0.25 m3 and pressure P = 200 kPa to final volume Vf = 1 m? and pressure Pf = 50 kPa. P (kPa) 200 150 100 a) The process depicted in Figure 3 is one of four the following fundamental 50 isobaric, isothermal, and adiabatic. Which type of process is it? Why? Explain your answer. processes: isochoric, V (m³ ) 0.25 0.5 0.75 Figure 3 b) Calculate the work done in this process. Show your work.
- 1. The pV-diagram shown illustrates the adiabatic compression of a di- atomic ideal gas from state b to state a. The curved dashed lines represent isotherms. If the gas has an initial pressure of 160 (kPa], what is its final pres- P (Pa) P. sure? A. 519.5 (kPa] T-420 K В. 219.3 (КPa] T- 300 K C. 332.4 (kPa] V (m) D. 464 [kPa) Which of the following energy flow dia- gram correctly describes a heat engine that op- erates by taking one mole of a diatomic ideal gas through the cycle 1-2-3-4-1 as shown in the pV diagram below. 2. Note: 1+2 and 34 (7, = 60OK) diabatie processes (T,- 400K) (7= 300K) 1 (T, - 200K) Volume (m') A. В. c. D. Hot Reservoir Hot Reservoir Hot Reservoir Hot Reservoir 6.24k 6.24 k 8.73 k 8.73 5.82 k 2.08 4.16 2.91 4.16k 2.08 2.91 k 5.82 k Cold Reservoir Cold Reservair Cold Reservoir Cold Reservoir 3. The figure shows a cyclic process where a diatomic ideal gas undergoes an isochoric pro- cess from a to b, an isobaric process from 6 to c, an iso- choric process from c…Based on the given pV diagram, match the answers with questions. Isotherms of v the change in themal energy for process 0-1 A. zero - v the change in themal energy for process 0-7 B. not enough information v the change in themal energy for process 0-6 c. negative D. positiveProblem 8 PV Diagram Consider the process shown. The values of To, Po, and the number of particles in the gas, N, are known. The curve in the second 'branch' is an isotherm. Find Vo, V3, P2, and T3. Ruchlom 0 mnogion P₂ Po- 8To To Vo T3 V3
- 16. Calculate the change internal energy of an ideal gas in J if the temperature is changed from 30.0 oC to 30.0oC. a. 0.00 Jb. 82.0 Jc. 19 Jd. -10.0 J5. A system consists of a two-phase liquid-vapor mixture of 5 kg of R-134a. One kg is saturated liquid. What is the quality? 6. Given the temperature and specific volume of a two-phase liquid-vapor mixture, how would you determine the specific internal energy? 2A gas expands from 2.2 L to 3.6 L against a constant external pressure of 1.6 atm. What is the work done? A. -227 J B. 227 J C. 2.24 J D. -2.24 J
- 5. What are the correct signs of heat and work done on the gas for the processes illustrated on the pV diagram below? Process BC is isothermal. Р (atm) B 1 A V (L) 15 10 А. WAB-0, QAВ-0, WBC0, QCA>0 В. WAB>0, QAB>0, WBC>0, Qвс>0, WCA0, QAB>0, WBC>0, QBс>0, WCA>0, QCA>0 D. WAB-0, QAB>0, WBC>0, Qвс0, QCA>0 Е. WAB-0, QAB0, WBC>0, WCA>0, QCAS0 2.4. The first law of thermodynamics states that a. components of a system interact. b. entropy of a closed system always increases. c. closed system always shifts toward disorder or homogeneity. d. Energy is always conserved. 5. According to the second law of thermodynamics, the heat received from a high temperature reservoir by a heat engine operating in a complete cycle a. must be completely converted to work. b. equals the entropy increase. C. converted completely into internal energy. d. cannot be completely converted to work.6. According to the first law of thermodynamics, applied to a gas, the increase in the internal energy during any process: A. equals the heat input minus the work done on the gas 1 B. equals the heat input plus the work done on the gas C. equals the work done on the gas minus the heat input D. is independent of the heat input E. is independent of the work done on the gas