College Physics: A Strategic Approach (3rd Edition)
3rd Edition
ISBN: 9780321879721
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
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Textbook Question
Chapter 11, Problem 58GP
The coefficient of performance of a refrigerator is 5.0.
a. If the compressor uses 10 J of energy, how much heat is exhausted to the hot reservoir?
b. If the hot-reservoir temperature is 27°C, what is the lowest possible temperature in °C of the cold reservoir?
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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…
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
㎡
A refrigerator’s freezer compartment is set at –10°C; the kitchen is 24°C. What is the theoretical minimum amount of electric energy necessary to pump 1.0 J of energy out of the freezer compartment?A. 0.89 J B. 0.87 J C. 0.13 J D. 0.11 J
Chapter 11 Solutions
College Physics: A Strategic Approach (3rd Edition)
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