EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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(I) The low temperature of a freezer cooling coil is -8o c andthe discharge temperature is 33°C. What is the maximumtheoretical coefficient of performance?
(II) How much less per year would it cost a family to operatea heat pump that has a coefficient of performance of 2.9 thanan electric heater that costs $2000 to heat their home for ayear? If the conversion to the heat pump costs $15,000, howlong would it take the family to break even on heating costs?How much would the family save in 20 years?
A certain brand of freezer is advertised to use 730 kW . hof energy per year. (a) Assuming the freezer operates for 5 hours eachday, how much power does it require while operating? (b) If the freezerkeeps its interior at -5.0C in a 20.0C room, what is its theoreticalmaximum performance coefficient? (c) What is the theoretical maximumamount of ice this freezer could make in an hour, starting withwater at 20.0C?
Chapter 20 Solutions
EBK PHYSICS FOR SCIENTISTS & ENGINEERS
Ch. 20.3 - Prob. 1AECh. 20.9 - Prob. 1DECh. 20 - Prob. 1QCh. 20 - Can you warm a kitchen in winter by leaving the...Ch. 20 - Would a definition of heat engine efficiency as e...Ch. 20 - Prob. 4QCh. 20 - Prob. 5QCh. 20 - The oceans contain a tremendous amount of thermal...Ch. 20 - Discuss the factors that keep real engines from...Ch. 20 - Prob. 8Q
Ch. 20 - Describe a process in nature that is nearly...Ch. 20 - (a) What happens if you remove the lid of a bottle...Ch. 20 - Prob. 11QCh. 20 - Prob. 12QCh. 20 - Give three examples, other than those mentioned in...Ch. 20 - Which do you think has the greater entropy, 1 kg...Ch. 20 - Prob. 16QCh. 20 - Prob. 17QCh. 20 - The first law of thermodynamics is sometimes...Ch. 20 - Powdered milk is very slowly (quasistatically)...Ch. 20 - Two identical systems are taken from state a to...Ch. 20 - It can he said that the total change in entropy...Ch. 20 - Prob. 22QCh. 20 - Prob. 23QCh. 20 - Prob. 1MCQCh. 20 - Prob. 2MCQCh. 20 - Prob. 3MCQCh. 20 - Prob. 4MCQCh. 20 - Prob. 5MCQCh. 20 - Prob. 6MCQCh. 20 - Prob. 7MCQCh. 20 - Prob. 8MCQCh. 20 - Prob. 9MCQCh. 20 - Prob. 10MCQCh. 20 - Prob. 11MCQCh. 20 - Prob. 12MCQCh. 20 - Prob. 1PCh. 20 - Prob. 2PCh. 20 - Prob. 3PCh. 20 - (II) A typical compact car experiences a total...Ch. 20 - Prob. 5PCh. 20 - (II) Figure 2017 is a PV diagram for a reversible...Ch. 20 - Prob. 7PCh. 20 - Prob. 8PCh. 20 - Prob. 9PCh. 20 - Prob. 10PCh. 20 - (II) (a) Show that the work done by a Carnot...Ch. 20 - Prob. 12PCh. 20 - Prob. 13PCh. 20 - Prob. 14PCh. 20 - (II) Assume that a 65 kg hiker needs 4.0 103 kcal...Ch. 20 - Prob. 16PCh. 20 - Prob. 18PCh. 20 - (III) A Carnot cycle, shown in Fig. 20-7, has the...Ch. 20 - (III) One mole of monatomic gas undergoes a Carnot...Ch. 20 - (III) In an engine that approximates the Otto...Ch. 20 - Prob. 22PCh. 20 - Prob. 23PCh. 20 - Prob. 24PCh. 20 - Prob. 25PCh. 20 - Prob. 26PCh. 20 - Prob. 27PCh. 20 - Prob. 28PCh. 20 - (II) An ideal heal pump is used to maintain the...Ch. 20 - Prob. 30PCh. 20 - Prob. 31PCh. 20 - Prob. 32PCh. 20 - Prob. 33PCh. 20 - Prob. 34PCh. 20 - Prob. 35PCh. 20 - (I) What is the change in entropy of 1.00 m3 of...Ch. 20 - Prob. 37PCh. 20 - (II) If 0.45kg f water at 100C is changed by a...Ch. 20 - Prob. 39PCh. 20 - Prob. 40PCh. 20 - Prob. 41PCh. 20 - Prob. 42PCh. 20 - Prob. 43PCh. 20 - Prob. 44PCh. 20 - Prob. 45PCh. 20 - Prob. 46PCh. 20 - Prob. 47PCh. 20 - (II) An ideal gas of n moles undergoes the...Ch. 20 - Prob. 49PCh. 20 - Prob. 50PCh. 20 - (II) Two samples of an ideal gas are initially at...Ch. 20 - (II) 1.00 mole of nitrogen (N2) gas and 1.00 mole...Ch. 20 - (II) (a) Why would you expect the total entropy...Ch. 20 - (II) Thermodynamic processes are sometimes...Ch. 20 - Prob. 55PCh. 20 - (III) Consider an ideal gas of n moles with molar...Ch. 20 - (III) A general theorem states that the amount of...Ch. 20 - Prob. 58PCh. 20 - (I) Use Eq. 2014 to determine the entropy of each...Ch. 20 - (II) Suppose that you repeatedly shake six coins...Ch. 20 - (II) (a) Suppose you have four coins, all with...Ch. 20 - Prob. 62PCh. 20 - Prob. 63PCh. 20 - Prob. 64PCh. 20 - Prob. 65PCh. 20 - Prob. 66PCh. 20 - Prob. 67GPCh. 20 - Prob. 68GPCh. 20 - A heat engine takes a diatomic gas around the...Ch. 20 - Prob. 70GPCh. 20 - Prob. 71GPCh. 20 - Prob. 72GPCh. 20 - The operation of a certain heat engine takes an...Ch. 20 - Prob. 74GPCh. 20 - Prob. 75GPCh. 20 - 1.00 mole of an ideal monatomic gas at STP first...Ch. 20 - Prob. 77GPCh. 20 - Prob. 78GPCh. 20 - Prob. 80GPCh. 20 - Prob. 82GPCh. 20 - The Stirling cycle shown in Fig 20-27, is useful...Ch. 20 - Prob. 84GPCh. 20 - Prob. 85GPCh. 20 - Thermodynamic processes can be represented not...Ch. 20 - An aluminum can, with negligible heat capacity, is...Ch. 20 - Prob. 88GPCh. 20 - A bowl contains a large number of red, orange, and...Ch. 20 - Prob. 90GPCh. 20 - Prob. 92GP
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- (I) What is the maximum efficiency of a heat engine whoseoperating temperatures are 560°C and 345°C?arrow_forward(a) Calculate the change in entropy when a 0.125-kg chunk of ice melts at 0◦C. Assume the melting occurs reversibly. (b) Suppose heat is now drawn reversibly from the 0◦ meltwater, causing a decrease in entropy of 112 J/K. How much ice freezes in the process?arrow_forward(I) The exhaust temperature of a heat engine is 230°C. Whatis the high temperature if the Carnot efficiency is 34%?arrow_forward
- (4) Find the heat input (from "cold reservoir") and the heat output (to "hot reservoir"): (5) Find the performance coefficient of the refrigerator: Q-hot Q-cold = Coefficient = J Jarrow_forwardA 1200-W electric resistance heating element whose diameter is 0.5 cm is immersed in 40 kg of water initially at 20C. Assuming the water container is well-insulated, determine how long it will take for this heater to raise the water temperature to 50C. Also, determine the entropy generated during this process, in kJ/K.arrow_forwardA refrigerator removes heat from a freezing chamber at -8 ⁰F and discharges it at 99 ⁰F. What is its maximum coefficient of performance?arrow_forward
- A heat pump maintains a dwelling at 68°F. When operating steadily, the power input to the heat pump is 7 hp, and the heat pump receives energy by heat transfer from 55°F well water at a rate of 500 Btu/min. (a) Determine the coefficient of performance. (b) Evaluating electricity at $0.08 per kWh, determine the cost of electricity in a month when the heat pump operates for 300 hours.arrow_forwardAn ideal refrigerator does 150 J of work to remove 560 J as heat from its cold compartment. (a) What is the refrigerator’s coefficient of performance? (b) How much heat per cycle is exhausted to the kitchen?arrow_forwardA refrigerator has a coefficient of performance of 3.0. (a) If it requires 200 J of work per cycle, how much heat per cycle does it remove the cold reservoir? (b) How much heat per cycle is discarded to the hot reservoir?arrow_forward
- A 1200-W electric resistance heating element whose diameter is 0.5 cm is immersed in 34 kg of water "cp=4.18 kJ/kg.K" initially at 20 C. Assuming the water container is well-insulated. What is the entropy generated during this process, " kJ/K" when the surroundings are at T=15 C?arrow_forward(II) A certain power plant puts out 580 MW of electricpower. Estimate the heat discharged per second, assumingthat the plant has an efficiency of 32%.arrow_forward(a) Calculate the change in entropy when a 0.125-kg chunk of ice melts at 0 °C. Assume the melting occurs reversibly.arrow_forward
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