(a) To determine The missing table entries, each in Btu . Explanation Process 2-3: Express the change in internal energy. ∑ Δ U = 0 ( Δ U ) 1 − 2 + ( Δ U ) 2 − 3 + ( Δ U ) 3 − 4 + ( Δ U ) 4 − 1 = 0 (I) Here, net change in internal energy is Δ U . Express the heat transfer. Q = Δ E + W (II) Here, change in total energy is Δ E and work done is W . Process 3-4: Express the change in kinetic energy. ∑ ΔKE = 0 ( ΔKE ) 1 − 2 + ( ΔKE ) 2 − 3 + ( ΔKE ) 3 − 4 + ( ΔKE ) 4 − 1 = 0 (III) Here, change in kinetic energy is ΔKE . Express the heat transfer. Q = Δ E + W (IV) Process 1-2: Express the change in internal energy. ∑ Δ E = 0 ( Δ E ) 1 − 2 + ( Δ E ) 2 − 3 + ( Δ E ) 3 − 4 + ( Δ E ) 4 − 1 = 0 (V) Here, change in total energy is Δ E Express change in internal energy. Δ E 1 − 2 = Δ U + Δ KE + ΔPE (VI) Here, change in internal energy is Δ U , change in kinetic energy is ΔKE , and change in gravitational potential energy is ΔPE . Express work. W = Δ E 1 − 2 − Q (VII) Process 4-1: Express work. W = Q − Δ E 4 − 1 (VIII) Conclusion: Process 2-3: Substitute 950 Btu for ( Δ U ) 1 − 2 , − 650 Btu for ( Δ U ) 3 − 4 and 200 Btu for ( Δ U ) 4 − 1 in Equation (I). 950 Btu + ( Δ U ) 2 − 3 + ( − 650 Btu ) + ( 200 Btu ) = 0 ( Δ U ) 2 − 3 = − 500 Btu Substitute − 450 Btu for Δ E and 450 Btu for W in Equation (II). Q = − 450 Btu + 450 Btu = 0 Process 3-4: Substitute 50 Btu for ( ΔKE ) 1 − 2 , 0 for ( ΔKE ) 2 − 3 and − 100 Btu for ( ΔKE ) 4 − 1 in Equation (III) (b) To determine The thermal efficiency for a system undergoing a power cycle.

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Author: MORAN

Publisher: WILEY

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. T…

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Chapter 2.7, Problem 75P

(a)

To determine

The missing table entries, each in Btu.

(b)

To determine

The thermal efficiency for a system undergoing a power cycle.

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Chapter 2.7, Problem 74P

Chapter 2.7, Problem 76P

Chapter 2 Solutions

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Ch. 2.7 - Prob. 1E Ch. 2.7 - 2. What are several things you as an individual...Ch. 2.7 - 3. How does the kilowatt-hour meter in your house...Ch. 2.7 - 4. Why is it incorrect to say that a system...Ch. 2.7 - Prob. 5E Ch. 2.7 - Prob. 6E Ch. 2.7 - 7. When microwaves are beamed onto a tumor during...Ch. 2.7 - 8. For good acceleration, what is more important...Ch. 2.7 - 9. Experimental molecular motors are reported to...Ch. 2.7 - 10. For polytropic expansion or compression, what...

Ch. 2.7 - Prob. 11E Ch. 2.7 - Prob. 12E Ch. 2.7 - 13. What form does the energy balance take for an...Ch. 2.7 - 14. What forms of energy and energy transfer are...Ch. 2.7 - Prob. 15E Ch. 2.7 - 16. Steve has a pedometer that reads kilocalories...Ch. 2.7 - Prob. 17E Ch. 2.7 - Prob. 1CU Ch. 2.7 - Prob. 11CU Ch. 2.7 - Prob. 12CU Ch. 2.7 - Prob. 13CU Ch. 2.7 - Prob. 14CU Ch. 2.7 - 15. In mechanics, the work of a resultant force...Ch. 2.7 - 16. What direction is the net energy transfer by...Ch. 2.7 - 17. The differential of work, δW, is said to be an...Ch. 2.7 - Prob. 18CU Ch. 2.7 - Prob. 19CU Ch. 2.7 - Prob. 20CU Ch. 2.7 - Prob. 21CU Ch. 2.7 - Prob. 22CU Ch. 2.7 - Prob. 23CU Ch. 2.7 - Prob. 24CU Ch. 2.7 - Prob. 25CU Ch. 2.7 - 26. State the sign convention used in...Ch. 2.7 - Prob. 27CU Ch. 2.7 - Prob. 28CU Ch. 2.7 - Prob. 29CU Ch. 2.7 - 30. Based on the mechanisms of heat transfer, list...Ch. 2.7 - Prob. 31CU Ch. 2.7 - Prob. 32CU Ch. 2.7 - 33. The total energy of a closed system can change...Ch. 2.7 - 34. The energy of an isolated system can only...Ch. 2.7 - 35. If a closed system undergoes a thermodynamic...Ch. 2.7 - Prob. 36CU Ch. 2.7 - Prob. 37CU Ch. 2.7 - Prob. 38CU Ch. 2.7 - Prob. 39CU Ch. 2.7 - Prob. 40CU Ch. 2.7 - Prob. 41CU Ch. 2.7 - 42. A process that is adiabatic cannot involve...Ch. 2.7 - Prob. 43CU Ch. 2.7 - Prob. 44CU Ch. 2.7 - Prob. 45CU Ch. 2.7 - Prob. 46CU Ch. 2.7 - 47. A rotating flywheel stores energy in the form...Ch. 2.7 - Prob. 48CU Ch. 2.7 - Prob. 49CU Ch. 2.7 - 50. If a closed system undergoes a process for...Ch. 2.7 - Prob. 51CU Ch. 2.7 - Prob. 52CU Ch. 2.7 - Prob. 53CU Ch. 2.7 - Prob. 54CU Ch. 2.7 - 2.1 A baseball has a mass of 0.3 lb. What is the...Ch. 2.7 - 2.2 Determine the gravitational potential energy,...Ch. 2.7 - 2.3 An object whose weight is 100 lbf experiences...Ch. 2.7 - 2.4 A construction crane weighing 12.000 lbf fell...Ch. 2.7 - 2.5 An automobile weighing 2500 lbf increases its...Ch. 2.7 - 2.6 An object of mass 1000 kg, initially having a...Ch. 2.7 - 2.7 A 30-seat turboprop airliner whose mass is...Ch. 2.7 - 2.8 An automobile having a mass of 900 kg...Ch. 2.7 - 2.9 Vehicle crumple zones are designed to absorb...Ch. 2.7 - 2.10 An object whose mass is 300 lb experiences...Ch. 2.7 - Prob. 11P Ch. 2.7 - 2.12 Using KE = Iω2/2 from Problem 2.11a, how fast...Ch. 2.7 - 2.13 Two objects having different masses are...Ch. 2.7 - 2.14 An object whose mass is 100 lb falls freely...Ch. 2.7 - 2.15 During the packaging process, a can of soda...Ch. 2.7 - 2.16 Beginning from rest, an object of mass 200 kg...Ch. 2.7 - 2.17 Jack, who weighs 150 lbf, runs 5 miles in 43...Ch. 2.7 - 2.18 An object initially at an elevation of 5 m...Ch. 2.7 - 2.19 An object of mass 10 kg, initially at rest,...Ch. 2.7 - 2.20 An object initially at rest experiences a...Ch. 2.7 - 2.21 The drag force, Fd, imposed by the...Ch. 2.7 - 2.22 A major force opposing the motion of a...Ch. 2.7 - 2.23 The two major forces opposing the motion of a...Ch. 2.7 - 2.24 Measured data for pressure versus volume...Ch. 2.7 - 2.25 Measured data for pressure versus volume...Ch. 2.7 - 2.26 A gas in a piston-cylinder assembly undergoes...Ch. 2.7 - 2.27 Carbon dioxide (CO2) gas within a...Ch. 2.7 - 2.28 A gas in a piston-cylinder assembly undergoes...Ch. 2.7 - 2.29 Nitrogen (N2) gas within a piston-cylinder...Ch. 2.7 - 2.30 Oxygen (O2) gas within a piston-cylinder...Ch. 2.7 - 2.31 A closed system consisting of 14.5 lb of air...Ch. 2.7 - 2.32 Air contained within a piston-cylinder...Ch. 2.7 - 2.33 A gas contained within a piston-cylinder...Ch. 2.7 - 2.34 Carbon monoxide gas (CO) contained within a...Ch. 2.7 - 2.35 Air contained within a piston-cylinder...Ch. 2.7 - 2.36 The belt sander shown in Fig. P2.36 has a...Ch. 2.7 - 2.37 A 0.15-m-diameter pulley turns a belt...Ch. 2.7 - 2.38 A 10-V battery supplies a constant current of...Ch. 2.7 - 2.39 An electric heater draws a constant current...Ch. 2.7 - 2.40 A car magazine article states that the power...Ch. 2.7 - 2.41 The pistons of a V-6 automobile engine...Ch. 2.7 - 2.42 Figure P2.42 shows an object whose mass is 5...Ch. 2.7 - Prob. 43P Ch. 2.7 - 2.44 A soap film is suspended on a wire frame, as...Ch. 2.7 - 2.45 As shown in Fig. P2.45, a spring having an...Ch. 2.7 - 2.46 A fan forces air over a computer circuit...Ch. 2.7 - 2.47 As shown in Fig. P2.47, the 6-in.-thick...Ch. 2.7 - 2.48 As shown in Fig. P2.48, an oven wall consists...Ch. 2.7 - 2.49 A composite plane wall consists of a...Ch. 2.7 - 2.50 A composite plane wall consists of a...Ch. 2.7 - 2.51 An insulated frame wall of a house has an...Ch. 2.7 - 2.52 Complete the following exercise using heat...Ch. 2.7 - Prob. 53P Ch. 2.7 - Prob. 54P Ch. 2.7 - 2.55 The outer surface of the grill hood shown in...Ch. 2.7 - 2.56 Each line of the following table gives data...Ch. 2.7 - 2.57 Each line of the following table gives data,...Ch. 2.7 - 2.58 A closed system of mass 10 kg undergoes a...Ch. 2.7 - Prob. 59P Ch. 2.7 - 2.60 A gas contained in a piston−cylinder assembly...Ch. 2.7 - 2.61 A gas contained within a piston−cylinder...Ch. 2.7 - 2.62 An electric motor draws a current of 10 amp...Ch. 2.7 - 2.63 As shown in Fig. P2.63, the outer surface of...Ch. 2.7 - 2.64 One kg of Refrigerant 22, initially at p1 =...Ch. 2.7 - 2.65 A gas is contained in a vertical...Ch. 2.7 - 2.66 A gas undergoes a process in a...Ch. 2.7 - 2.67 Four kilograms of carbon monoxide (CO) is...Ch. 2.7 - 2.68 Helium gas is contained in a closed rigid...Ch. 2.7 - 2.69 Steam in a piston−cylinder assembly undergoes...Ch. 2.7 - 2.70 Air expands adiabatically in a...Ch. 2.7 - 2.71 A vertical piston−cylinder assembly with a...Ch. 2.7 - 2.72 Gaseous CO2 is contained in a vertical...Ch. 2.7 - 2.73 Figure P2.73 shows a gas contained in a...Ch. 2.7 - 2.74 The following table gives data, in kJ, for a...Ch. 2.7 - 2.75 The following table gives data, in Btu, for a...Ch. 2.7 - 2.76 Figure P2.76 shows a power cycle executed by...Ch. 2.7 - 2.77 A gas within a piston−cylinder assembly...Ch. 2.7 - 2.78 A gas within a piston-cylinder assembly...Ch. 2.7 - 2.79 A gas undergoes a cycle in a piston-cylinder...Ch. 2.7 - 2.80 As shown in Fig. P2.80, a gas within a...Ch. 2.7 - Prob. 81P Ch. 2.7 - Prob. 82P Ch. 2.7 - Prob. 83P Ch. 2.7 - Prob. 84P Ch. 2.7 - 2.85 A concentrating solar collector system, as...Ch. 2.7 - Prob. 86P Ch. 2.7 - Prob. 87P Ch. 2.7 - Prob. 88P Ch. 2.7 - 2.89 A refrigeration cycle operating as shown in...Ch. 2.7 - Prob. 90P Ch. 2.7 - Prob. 91P Ch. 2.7 - Prob. 92P Ch. 2.7 - Prob. 93P Ch. 2.7 - Prob. 94P Ch. 2.7 - 2.95 A heat pump maintains a dwelling at 688F....Ch. 2.7 - 2.96 A heat pump cycle delivers energy by heat...

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