Problem 1E Problem 2E: 2. What are several things you as an individual can do to reduce energy use in your home? While... Problem 3E: 3. How does the kilowatt-hour meter in your house measure electric energy usage?
Problem 4E: 4. Why is it incorrect to say that a system contains heat?
Problem 5E Problem 6E Problem 7E: 7. When microwaves are beamed onto a tumor during cancer therapy to increase the tumor’s... Problem 8E: 8. For good acceleration, what is more important for an automobile engine, horsepower or torque?
Problem 9E: 9. Experimental molecular motors are reported to exhibit movement upon the absorption of light,... Problem 10E: 10. For polytropic expansion or compression, what causes the value of n to vary from process to... Problem 11E Problem 12E Problem 13E: 13. What form does the energy balance take for an isolated system?
Problem 14E: 14. What forms of energy and energy transfer are present in the life cycle of a thunderstorm?
Problem 15E Problem 16E: 16. Steve has a pedometer that reads kilocalories burned. How many miles does he need to walk to... Problem 17E Problem 1CU Problem 11CU Problem 12CU Problem 13CU Problem 14CU Problem 15CU: 15. In mechanics, the work of a resultant force acting on a body equals the change in its... Problem 16CU: 16. What direction is the net energy transfer by work for a power cycle: in or out? The net energy... Problem 17CU: 17. The differential of work, δW, is said to be an ____________differential.
Problem 18CU Problem 19CU Problem 20CU Problem 21CU Problem 22CU Problem 23CU Problem 24CU Problem 25CU Problem 26CU: 26. State the sign convention used in thermodynamics for energy transfer by work for a closed... Problem 27CU Problem 28CU Problem 29CU Problem 30CU: 30. Based on the mechanisms of heat transfer, list three reasons why energy transfer by heat may be... Problem 31CU Problem 32CU Problem 33CU: 33. The total energy of a closed system can change as a result of energy transfer across the system... Problem 34CU: 34. The energy of an isolated system can only increase.
Problem 35CU: 35. If a closed system undergoes a thermodynamic cycle, there can be no net work or heat transfer.
Problem 36CU Problem 37CU Problem 38CU Problem 39CU Problem 40CU Problem 41CU Problem 42CU: 42. A process that is adiabatic cannot involve work.
Problem 43CU Problem 44CU Problem 45CU Problem 46CU Problem 47CU: 47. A rotating flywheel stores energy in the form of kinetic energy.
Problem 48CU Problem 49CU Problem 50CU: 50. If a closed system undergoes a process for which the work is negative and the heat transfer is... Problem 51CU Problem 52CU Problem 53CU Problem 54CU Problem 1P: 2.1 A baseball has a mass of 0.3 lb. What is the kinetic energy relative to home plate of a 94 mile... Problem 2P: 2.2 Determine the gravitational potential energy, in kJ, of 2 m3 of liquid water at an elevation of... Problem 3P: 2.3 An object whose weight is 100 lbf experiences a decrease in kinetic energy of 500 ft ∙ lbf and... Problem 4P: 2.4 A construction crane weighing 12.000 lbf fell from a height of 400 ft to the street below during... Problem 5P: 2.5 An automobile weighing 2500 lbf increases its gravitational potential energy by 2.25 × 10 Btu in... Problem 6P: 2.6 An object of mass 1000 kg, initially having a velocity of 100 m/s, decelerates to a final... Problem 7P: 2.7 A 30-seat turboprop airliner whose mass is 14,000 kg takes off from an airport and eventually... Problem 8P: 2.8 An automobile having a mass of 900 kg initially moves along a level highway at 100 km/h relative... Problem 9P: 2.9 Vehicle crumple zones are designed to absorb energy during an impact by deforming to reduce... Problem 10P: 2.10 An object whose mass is 300 lb experiences changes in its kinetic and potential energies owing... Problem 11P Problem 12P: 2.12 Using KE = Iω2/2 from Problem 2.11a, how fast would a flywheel whose moment of inertia is 200... Problem 13P: 2.13 Two objects having different masses are propelled vertically from the surface of Earth, each... Problem 14P: 2.14 An object whose mass is 100 lb falls freely under the influence of gravity from an initial... Problem 15P: 2.15 During the packaging process, a can of soda of mass 0.4 kg moves down a surface inclined 20°... Problem 16P: 2.16 Beginning from rest, an object of mass 200 kg slides down a 10-m-long ramp. The ramp is... Problem 17P: 2.17 Jack, who weighs 150 lbf, runs 5 miles in 43 minutes on a treadmill set at a one-degree incline... Problem 18P: 2.18 An object initially at an elevation of 5 m relative to Earth’s surface with a velocity of 50... Problem 19P: 2.19 An object of mass 10 kg, initially at rest, experiences a constant horizontal acceleration of 4... Problem 20P: 2.20 An object initially at rest experiences a constant horizontal acceleration due to the action of... Problem 21P: 2.21 The drag force, Fd, imposed by the surrounding air on a vehicle moving with velocity V is given... Problem 22P: 2.22 A major force opposing the motion of a vehicle is the rolling resistance of the tires, Fr,... Problem 23P: 2.23 The two major forces opposing the motion of a vehicle moving on a level road are the rolling... Problem 24P: 2.24 Measured data for pressure versus volume during the compression of a refrigerant within the... Problem 25P: 2.25 Measured data for pressure versus volume during the r expansion of gases within the cylinder of... Problem 26P: 2.26 A gas in a piston-cylinder assembly undergoes a process for which the relationship between... Problem 27P: 2.27 Carbon dioxide (CO2) gas within a piston-cylinder assembly undergoes a process from a state... Problem 28P: 2.28 A gas in a piston-cylinder assembly undergoes a compression process for which the relation... Problem 29P: 2.29 Nitrogen (N2) gas within a piston-cylinder assembly undergoes a compression from p1 = 20 bar,... Problem 30P: 2.30 Oxygen (O2) gas within a piston-cylinder assembly undergoes an expansion from a volume V1 =... Problem 31P: 2.31 A closed system consisting of 14.5 lb of air undergoes a polytropic process from p1 = 80... Problem 32P: 2.32 Air contained within a piston-cylinder assembly is slowly compressed. As shown in Fig. P2.32,... Problem 33P: 2.33 A gas contained within a piston-cylinder assembly undergoes three processes in series:
Process... Problem 34P: 2.34 Carbon monoxide gas (CO) contained within a piston-cylinder assembly undergoes three processes... Problem 35P: 2.35 Air contained within a piston-cylinder assembly undergoes three processes in series:
Process... Problem 36P: 2.36 The belt sander shown in Fig. P2.36 has a belt speed of 1500 ft/min. The coefficient of... Problem 37P: 2.37 A 0.15-m-diameter pulley turns a belt rotating the driveshaft of a power plant pump. The torque... Problem 38P: 2.38 A 10-V battery supplies a constant current of 0.5 amp to a resistance for 30 min. (a) Determine... Problem 39P: 2.39 An electric heater draws a constant current of 6 amp, with an applied voltage of 220 V, for 24... Problem 40P: 2.40 A car magazine article states that the power W delivered by an automobile engine, in hp, is... Problem 41P: 2.41 The pistons of a V-6 automobile engine develop 226 hp. If the engine driveshaft rotational... Problem 42P: 2.42 Figure P2.42 shows an object whose mass is 5 lb attached to a rope wound around a pulley. The... Problem 43P Problem 44P: 2.44 A soap film is suspended on a wire frame, as shown in Fig. 2.10. The movable wire is displaced... Problem 45P: 2.45 As shown in Fig. P2.45, a spring having an initial unstretched length of ℓ0 is stretched by a... Problem 46P: 2.46 A fan forces air over a computer circuit board with surface area of 70 cm2 to avoid... Problem 47P: 2.47 As shown in Fig. P2.47, the 6-in.-thick exterior wall of a building has an average thermal... Problem 48P: 2.48 As shown in Fig. P2.48, an oven wall consists of a 0.635-cm-thick layer of steel (ks = 15.1 W/m... Problem 49P: 2.49 A composite plane wall consists of a 12-in.-thick layer of insulating concrete block (kc = 0.27... Problem 50P: 2.50 A composite plane wall consists of a 3-in.-thick layer of insulation (ks = 0.029 Btu/h ∙ ft ∙... Problem 51P: 2.51 An insulated frame wall of a house has an average thermal conductivity of 0.04 Btu/h ∙ ft ∙ °R.... Problem 52P: 2.52 Complete the following exercise using heat transfer relations:
(a) Referring to Fig. 2.12,... Problem 53P Problem 54P Problem 55P: 2.55 The outer surface of the grill hood shown in Fig. P2.55 is at 47°C and the emissivity is 0.93.... Problem 56P: 2.56 Each line of the following table gives data for a process of a closed system. Each entry has... Problem 57P: 2.57 Each line of the following table gives data, in Btu, for a process of a closed system.... Problem 58P: 2.58 A closed system of mass 10 kg undergoes a process during which there is energy transfer by work... Problem 59P Problem 60P: 2.60 A gas contained in a piston−cylinder assembly undergoes two processes, A and B, between the... Problem 61P: 2.61 A gas contained within a piston−cylinder assembly
undergoes two processes, A and B, between the... Problem 62P: 2.62 An electric motor draws a current of 10 amp with a voltage of 110 V, as shown in Fig. P2.62.... Problem 63P: 2.63 As shown in Fig. P2.63, the outer surface of a transistor is cooled convectively by a... Problem 64P: 2.64 One kg of Refrigerant 22, initially at p1 = 0.9 MPa, u1 = 232.92 kJ/kg, is contained within a... Problem 65P: 2.65 A gas is contained in a vertical piston-cylinder assembly by a piston with a face area of 40... Problem 66P: 2.66 A gas undergoes a process in a piston−cylinder assembly during which the pressure−specific... Problem 67P: 2.67 Four kilograms of carbon monoxide (CO) is contained in a rigid tank with a volume of 1 m3. The... Problem 68P: 2.68 Helium gas is contained in a closed rigid tank. An electric resistor in the tank transfers... Problem 69P: 2.69 Steam in a piston−cylinder assembly undergoes a polytropic process. Data for the initial and... Problem 70P: 2.70 Air expands adiabatically in a piston−cylinder assembly from an initial state where p1 = 100... Problem 71P: 2.71 A vertical piston−cylinder assembly with a piston of mass 25 kg and having a face area of 0.005... Problem 72P: 2.72 Gaseous CO2 is contained in a vertical piston−cylinder assembly by a piston of mass 50 kg and... Problem 73P: 2.73 Figure P2.73 shows a gas contained in a vertical piston−cylinder assembly. A vertical shaft... Problem 74P: 2.74 The following table gives data, in kJ, for a system undergoing a power cycle consisting of four... Problem 75P: 2.75 The following table gives data, in Btu, for a system undergoing a power cycle consisting of... Problem 76P: 2.76 Figure P2.76 shows a power cycle executed by a gas in a piston−cylinder assembly. For process... Problem 77P: 2.77 A gas within a piston−cylinder assembly undergoes a thermodynamic cycle consisting of three... Problem 78P: 2.78 A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three... Problem 79P: 2.79 A gas undergoes a cycle in a piston-cylinder assembly consisting of the following three... Problem 80P: 2.80 As shown in Fig. P2.80, a gas within a piston-cylinder assembly undergoes a thermodynamic cycle... Problem 81P Problem 82P Problem 83P Problem 84P Problem 85P: 2.85 A concentrating solar collector system, as shown in Fig. P2.85, provides energy by heat... Problem 86P Problem 87P Problem 88P Problem 89P: 2.89 A refrigeration cycle operating as shown in Fig. 2.17b has a coefficient of performance β =... Problem 90P Problem 91P Problem 92P Problem 93P Problem 94P Problem 95P: 2.95 A heat pump maintains a dwelling at 688F. When operating steadily, the power input to the heat... Problem 96P: 2.96 A heat pump cycle delivers energy by heat transfer to a dwelling at a rate of 40,000 Btu/h. The...