An ice-making machine inside a refrigerator operates ina Carnot cycle. It takes heat from liquid water at 0.0 °Cand rejects heat to a room at a temperature of 24.5 °C.Suppose that liquid water with a mass of 77.8 kg at 0.0°C is converted to ice at the same temperature.Take the heat of fusion for water to be Lf = 3.34×105J/kg. Part AHow much heat |H| is rejected to the room?Express your answer in joules to four significant figures.▸ View Available Hint(s)QH 2.832×107 J=SubmitPrevious AnswersPart BCorrectHow much energy E must be supplied to the device?Express your answer in joules.▸ View Available Hint(s)E=SubmitΤΟ ΑΣΦ?J

Answered: An ice-making machine inside a…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter4: The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 66P: A Carnot refrigerator exhausts heat to the air, which is at a temperature of 25 . How much is used...

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Consider the latent heat of fusion and the latent heat of vaporization for H2O, 3.33 105 J/kg and 2.256 106 J/kg, respectively. How much heat is needed to a. melt 2.00 kg of ice and b. vaporize 2.00 kg of water? Assume the temperatures of the ice and steam are at the melting point and vaporization point, respectively. (a). UsingEq21.9, Q = mLF = (2.00 kg) (3.33l05 J/kg) = 6.66105 J (b).UsingEq21.10. Q = mLV = (2.00kg) (2.256106 J/kg) = 14.51106 J
For a temperature increase of 10 at constant volume, what is the heat absorbed by (a) 3.0 mol of a dilute monatomic gas; (b) 0.50 mol of a dilute diatomic gas; and (c) 15 mol of a dilute polyatomic gas?
An ideal gas initially at 300 K undergoes an isobaric expansion at 2.50 kPa. If the volume increases from 1.00 m3 to 3.00 m3 and 12.5 kJ is transferred to the gas by heat, what are (a) the change in its internal energy and (b) its final temperature?
Suppose 26.0 g of neon gas are stored in a tank at a temperature of 152C. (a) What is the temperature of the gas on the Kelvin scale? (See Section 10.2.) (b) How many moles of gas are in the tank? (See Section 10.4.) (c) What is the internal energy of the gas? (See Section 10.5.)
A Carnot refrigerator exhausts heat to the air, which is at a temperature of 25 . How much is used by the refrigerator if it freezes 1.5 g of water per second? Assume the water is at 0 .
A high-end gas stove usually has at least one burner rated at 14 000 Btu/h. (a) If you place a 0.25-kg aluminum pot containing 2.0 liters of water at 20.C on this burner, how long will it take to bring the water to a boil, assuming all the heat from the burner goes into the pot? (b) Once boiling begins how much time is required to boil all the water out of the pot?
Equal masses of substance A at 10.0C and substance B at 90.0C are placed in a well-insulated container of negligible mass and allowed to come to equilibrium. If the equilibrium temperature is 75.0Q which substance has the larger specific heat? (a) substance A (b) substance B (c) The specific heats are identical. (d) The answer depends on the exact initial temperatures. (e) More information is required.
(a) What is the rate of heat conduction through the 3.00-cm-thick fur of a large animal having a I .40-m surface area? Assume that the animal's skin temperature is 32.0 , that the air temperature is 5.00 , and that has the same thermal conductivity as air. (b) What food intake will the animal need in one day to replace this heat transfer?
An ice-making machine inside a refrigerator operates in a Carnot cycle. It takes heat from liquid water at 0.0 °C and rejects heat to a room at a temperature of 20.3 °C. Suppose that liquid water with a mass of 84.2 kg at 0.0 °C is converted to ice at the same temperature. Take the heat of fusion for water to be Lf = 3.34×105 J/kg . How much heat |QH| is rejected to the room? Express your answer in joules to four significant figures. ► View Available Hint(s)
An ice-making machine inside a refrigerator operates in a Carnot cycle. It takes heat from liquid water at 0.0 °C and rejects heat to a room at a temperature of 20.3 °C. Suppose that liquid water with a mass of 84.2 kg at 0.0 °C is converted to ice at the same temperature. = 3.34×105 Take the heat of fusion for water to be Lf = J/kg. How much heat |QH| is rejected to the room? Express your answer in joules to four significant figures. ► View Available Hint(s) |QH|= 3.021×107 J Submit Previous Answers Correct Part B How much energy E must be supplied to the device? Express your answer in joules.
Suppose you have 2.5kg of steam at 100 degrees celcius occupying 6.5 meters cubed at a pressure of 1.013 x 10^5 Pa. When the steam condenses to water at 100 degrees celcius it occupies a volume of 0.55 meters cubed. If the latent heat of vaporization of water is 2.26 x 10^6 J/kg, what was the change in the water's internal energy?
The concrete slab of a basement is 11m long, 8 m wide and 0.2 m thick. During the winter, temperatures are nominally 17°C and 10°C at the top and bottom respectively. If the concrete has thermal conductivity of 1.4 W/m K, what is the rate of heat loss through the slab? If the basement is heated by a gas furnace operating at an efficiency of 90% using natural gas priced at Cg = Php 1.00/MJ, what is the daily cost of heat loss?

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