Bundle: Principles of Physics: A Calculus-Based Text, 5th + WebAssign Printed Access Card for Serway/Jewett's Principles of Physics: A Calculus-Based Text, 5th Edition, Multi-Term
5th Edition
ISBN: 9781133422013
Author: Raymond A. Serway; John W. Jewett
Publisher: Cengage Learning
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Chapter 18, Problem 18P
To determine
Input power required.
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A refrigerator has a coefficient of performance of 3.00. The ice tray compartment is at -10.0°C, and the room temperature is 17.0°C. The refrigerator can convert 22.0 g of water at 17.0°C to 22.0 g of ice at -10.0°C each minute. What input power is required? Give your answer in watts.
0.90 L of 25 °C water is placed in a
refrigerator. The refrigerator's motor must
supply an extra 9.0 W power to chill the
water to 5°C in 1.0h. What is the
refrigerator's coefficient of performance?
m = 0.517 kg of methanol in atmospheric pressure is heated with an electric heater from T₁ = 27.9 °C to its boiling point. After the
heating m, 0.17 kg of the methanol is vaporized. Heating and vaporizing takes t = 428.71 s with n = 0.79 heater's efficiency.
What is the volume of methanol?
V =
What is the energy required for heating?
E₁
kJ
What is the energy required for vaporizing?
Ev =
kJ
What is the power of the heater?
P =
kW
What is the electr. energy needed for heating and vaporizing?
Ee
kJ
Insert the answer with 3 significant digits without rounding the answer.
Constant Value Unit
kJ
с
h
P
Tb
2.53 kg K
1165
786.3
64.7
m³
pareng
kJ
kg
kg
㎡
Chapter 18 Solutions
Bundle: Principles of Physics: A Calculus-Based Text, 5th + WebAssign Printed Access Card for Serway/Jewett's Principles of Physics: A Calculus-Based Text, 5th Edition, Multi-Term
Ch. 18.1 - The energy input to an engine is 3.00 times...Ch. 18.3 - Prob. 18.2QQCh. 18.4 - Prob. 18.3QQCh. 18.6 - (a) Suppose you select four cards at random from a...Ch. 18.7 - Which of the following is true for the entropy...Ch. 18.7 - An ideal gas is taken from an initial temperature...Ch. 18.8 - True or False: The entropy change in an adiabatic...Ch. 18 - Prob. 1OQCh. 18 - Prob. 2OQCh. 18 - A refrigerator has 18.0 kJ of work done on it...
Ch. 18 - Prob. 4OQCh. 18 - Consider cyclic processes completely characterized...Ch. 18 - Prob. 6OQCh. 18 - Prob. 7OQCh. 18 - Prob. 8OQCh. 18 - A sample of a monatomic ideal gas is contained in...Ch. 18 - Assume a sample of an ideal gas is at room...Ch. 18 - Prob. 11OQCh. 18 - Prob. 1CQCh. 18 - Prob. 2CQCh. 18 - Prob. 3CQCh. 18 - Prob. 4CQCh. 18 - Prob. 5CQCh. 18 - Prob. 6CQCh. 18 - Prob. 7CQCh. 18 - Prob. 8CQCh. 18 - Prob. 9CQCh. 18 - Prob. 10CQCh. 18 - Prob. 11CQCh. 18 - Discuss three different common examples of natural...Ch. 18 - The energy exhaust from a certain coal-fired...Ch. 18 - Prob. 1PCh. 18 - Prob. 2PCh. 18 - Prob. 3PCh. 18 - Prob. 4PCh. 18 - Prob. 5PCh. 18 - Prob. 6PCh. 18 - Prob. 7PCh. 18 - Prob. 8PCh. 18 - Prob. 9PCh. 18 - Prob. 10PCh. 18 - Prob. 11PCh. 18 - Prob. 12PCh. 18 - Prob. 13PCh. 18 - Prob. 14PCh. 18 - Argon enters a turbine at a rate of 80.0 kg/min, a...Ch. 18 - Prob. 16PCh. 18 - A refrigerator has a coefficient of performance...Ch. 18 - Prob. 18PCh. 18 - Prob. 19PCh. 18 - In 1993, the U.S. government instituted a...Ch. 18 - Prob. 21PCh. 18 - Prob. 22PCh. 18 - Prob. 23PCh. 18 - Prob. 24PCh. 18 - A heat pump used for heating shown in Figure...Ch. 18 - Prob. 26PCh. 18 - Prob. 27PCh. 18 - An ice tray contains 500 g of liquid water at 0C....Ch. 18 - Prob. 29PCh. 18 - Prob. 30PCh. 18 - Prob. 31PCh. 18 - (a) Prepare a table like Table 18.1 for the...Ch. 18 - Prob. 33PCh. 18 - Prob. 34PCh. 18 - Prob. 35PCh. 18 - Prob. 36PCh. 18 - Prob. 37PCh. 18 - Prob. 38PCh. 18 - Prob. 39PCh. 18 - Prob. 40PCh. 18 - Prob. 41PCh. 18 - Prob. 42PCh. 18 - (a) Find the kinetic energy of the moving air in a...Ch. 18 - Prob. 45PCh. 18 - Prob. 46PCh. 18 - Prob. 47PCh. 18 - An idealized diesel engine operates in a cycle...Ch. 18 - Prob. 49PCh. 18 - Prob. 50PCh. 18 - Prob. 51PCh. 18 - Prob. 52PCh. 18 - Prob. 53PCh. 18 - Prob. 54PCh. 18 - Prob. 55PCh. 18 - Prob. 56PCh. 18 - Prob. 57PCh. 18 - Prob. 58PCh. 18 - Prob. 59PCh. 18 - Prob. 60PCh. 18 - Prob. 61PCh. 18 - Prob. 62PCh. 18 - A 1.00-mol sample of an ideal monatomic gas is...Ch. 18 - Prob. 64PCh. 18 - Prob. 65P
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- A heat pump has a coefficient of performance equal to 4.20 and requires a power of 1.75 kW to operate. (a) How much energy does the heat pump add to a home in one hour? (b) If the heat pump is reversed so that it acts as an air conditioner in the summer, what would be its coefficient of performance?arrow_forward(a) What is the best coefficient of performance for a refrigerator that cools an environment at 30.0C and has heat transfer to another environment at 45.0C ? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60106J (a kilowatthour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.arrow_forwardA refrigerator has 18.0 kJ of work done on it while 115 kJ of energy is transferred from inside its interior. What is its coefficient of performance? (a) 3.40 (b) 2.80 (c) 8.90 (d) 6.40 (e) 5.20arrow_forward
- Show that the coefficients of performance of refrigerators and heat pumps are related by COPref=COPhp1. Start with the definitions of the COP s and the conservation of energy relationship between Qh, QC, and W.arrow_forwardA power plant has been proposed that would make use of the temperature gradient in the ocean. The system is to operate between 20.0C (surface water temperature) and 5.00C (water temperature at a depth of about 1 km). (a) What is the maximum efficiency of such a system? (b) If the useful power output of the plant is 75.0 MW, how much energy is absorbed per hour? (c) In view of your answer to part (a), do you think such a system is worthwhile (considering that there is no charge for fuel)?arrow_forwardA thermal engine produces 4 MJ of electrical energy while operating between two thermal baths of different temperatures. The working substance of the engine discharges 5 MJ of heat to the cold temperature bath. What is the efficiency of the engine?arrow_forward
- m = 0.593 kg of methanol in atmospheric pressure is heated with an electric heater from T₁ = 30.2 °C to its boiling point. After the heating my methanol is vaporized. Heating and vaporizing takes t = 450.41 s with n=0.59 heater's efficiency. What is the volume of methanol? V = What is the energy required for heating? E₁ = 1 kJ m³ Your last answer was interpreted as follows: 1 What is the energy required for vaporizing? Ev = 1 kJ Your last answer was interpreted as follows: 1 What is the power of the heater? P = 1 с Your last answer was interpreted as follows: 1 Your last answer was interpreted as follows: 1 What is the electr. energy needed for heating and vaporizing? Eε = 1 kJ Your last answer was interpreted as follows: 1 h Do not leave any fields blank. If you don't know the answer, insert 1 for example. Insert the answer with 3 significant digits without rounding the answer. Constant P Tb Value Unit 2.53 1165 786.3 64.7 °C umges Quantity heat capacity kg K kJ kW kg kg LAN Symbol h…arrow_forward9. A refrigerator has a coefficient of performance of 3.00. The ice tray compartment is at −20.0℃ and the room temperature is 22.0℃. The refrigerator can convert 33.0 g of water at 22.0℃ to 30.0 g of ice at −20.0℃ each minute. What input power in watts is required?arrow_forwardA Carnot refrigerator operates with an efficiency n = 0.66666666666667 between a hot reservoir at temperature T₁ = 50 K and a cold reservoir at temperature T2. Calculate the temperature T₂ of the cold reservoir. Select one: O a. T₁ O b. T₁ = 150.0 O d. T₁ = = 25.0 O c. T₁ 16.666666666667 = = 20.0arrow_forward
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