College Physics (10th Edition)
10th Edition
ISBN: 9780321902788
Author: Hugh D. Young, Philip W. Adams, Raymond Joseph Chastain
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 16, Problem 5CQ
Why must a room air conditioner be placed in a window rather than just set on the floor and plugged in? Why can a refrigerator be set on the floor and plugged in?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
(a) energy per cycle is delivered as heat to the room and (b) work
per cycle is required to run the freezer?
A 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.
Assume that the turbines at a coal-powered power plant were upgraded resulting in an improvement in efficiency of 3.14%. Assume that prior to
the upgrade the power station had an efficiency of 38%, and that the heat transfer into the engine in one day is still the same at 2.63 x 1014 J.
(a) How much more electrical power is produced due to the upgrade?
95581
v kW
(b) How much less heat transfer occurs to the environment due to the upgrade?
800000000000c x J
Chapter 16 Solutions
College Physics (10th Edition)
Ch. 16 - Under what conditions will the entropy of a gas...Ch. 16 - In what ways is a heat pump different from (or...Ch. 16 - Prob. 3CQCh. 16 - A growing plant creates a highly complex and...Ch. 16 - Why must a room air conditioner be placed in a...Ch. 16 - If you pour a cup of hot water into a cup of cold...Ch. 16 - How can the thermal conduction of heat from a hot...Ch. 16 - How can the free expansion of a gas into a vacuum...Ch. 16 - Does the second law of thermodynamics say that...Ch. 16 - Prob. 10CQ
Ch. 16 - Prob. 11CQCh. 16 - What would be the efficiency of a Carnot engine...Ch. 16 - The first law of thermodynamics is sometimes...Ch. 16 - Would it be more economical to run a refrigerator...Ch. 16 - An insulated box has a carrier that confines a gas...Ch. 16 - Prob. 2MCPCh. 16 - Carnot engine A operates between temperatures of...Ch. 16 - Prob. 4MCPCh. 16 - Prob. 5MCPCh. 16 - You want to increase the efficiency of a Carnot...Ch. 16 - Prob. 7MCPCh. 16 - You perform 100 J of work on a refrigerator that...Ch. 16 - If you mix cold milk with hot coffee in an...Ch. 16 - A glass of water left outside on a cold night...Ch. 16 - Prob. 11MCPCh. 16 - Prob. 12MCPCh. 16 - A coal-fired power plant that operates at an...Ch. 16 - Each cycle, a certain heat engine expels 250 J of...Ch. 16 - A diesel engine performs 2200 J of mechanical work...Ch. 16 - An aircraft engine has a heat efficiency of e =...Ch. 16 - A certain nuclear power plant has a thermal...Ch. 16 - Figure 16.15 shows a pV diagram for a heat engine...Ch. 16 - The pV diagram in Figure 16.16 shows a cycle of a...Ch. 16 - A gasoline engine. A gasoline engine takes in 1.61...Ch. 16 - A gasoline engine has a power output of 180 kW...Ch. 16 - In one cycle, a freezer uses 785 J of electrical...Ch. 16 - A refrigerator has a coefficient of performance of...Ch. 16 - Prob. 12PCh. 16 - A freezer has a coefficient of performance of...Ch. 16 - A cooing unit for chilling the water of an...Ch. 16 - A Carnot engine whose high-temperature reservoir...Ch. 16 - A heat engine is to be built to extract energy...Ch. 16 - A Carnot engine is operated between two heat...Ch. 16 - A Carnot engine has an efficiency of 59% and...Ch. 16 - An ice-making machine operates as a Carnot...Ch. 16 - A Carnot freezer that runs on electricity removes...Ch. 16 - Set Up: For an engine, W and QH positive and QC is...Ch. 16 - A sophomore with nothing better to do adds heat to...Ch. 16 - A 4.50 kg block of ice at 0.00C falls into the...Ch. 16 - You decide to take a nice hot bath but discover...Ch. 16 - A crucible contains 0.1 kg of liquid lead that is...Ch. 16 - Three moles of an ideal gas undergo a reversible...Ch. 16 - Entropy change due to driving. Premium gasoline...Ch. 16 - Entropy change from a doughnut. A typical doughnut...Ch. 16 - Solar collectors. A well-insulated house of...Ch. 16 - Prob. 30PCh. 16 - An experimental power plant at the Natural Energy...Ch. 16 - Solar water heater. A solar water heater for...Ch. 16 - You are designing a Carnal engine that has 2 mol...Ch. 16 - A heat engine takes 0.350 mol of an ideal diatomic...Ch. 16 - As a budding mechanical engineer, you are called...Ch. 16 - Prob. 36GPCh. 16 - A Carnot engine operates between two heat...Ch. 16 - An engineer is working with a Carnot engine that...Ch. 16 - Human entropy. A person having skin of surface...Ch. 16 - A typical coal-fired power plant generates 1000 MW...Ch. 16 - A human engine. You decide to use your body as a...Ch. 16 - One end of a copper rod is immersed in boiling...Ch. 16 - The pV diagram in Figure 16.19 shows a heat engine...Ch. 16 - Passage Problems Power from the sea. Ocean thermal...Ch. 16 - What is the change in entropy of the ammonia...Ch. 16 - Compare the entropy change of the warmer water to...Ch. 16 - If the proposed plant is built and produces 10 MW...
Additional Science Textbook Solutions
Find more solutions based on key concepts
9. Blocks with masses of 1 kg, 2 kg, and 3 kg are lined up in a row on a frictionless table. All three are push...
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
Review your answers to Questions 1-4. Do you still agree with the answers you provided? If not, describe (next ...
Lecture- Tutorials for Introductory Astronomy
48. A football is kicked straight up into the air; it hits the ground 5.2 s later.
a. What was the greatest hei...
College Physics: A Strategic Approach (4th Edition)
The temperature of n moles of ideal gas is changed from T1 to T2 at constant volume. Show that the correspondin...
Essential University Physics (3rd Edition)
The speed of the person sitting on the chair relative to the chair and relative to Earth.
Conceptual Physics (12th Edition)
Choose the best answer to each of the following. Explain your reasoning. Which of these star clusters is oldest...
The Cosmic Perspective Fundamentals (2nd Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- An engine with an efficiency of 0.30 absorbs 500 J of heat per cycle. (a) How much work does it perform per cycle? (b) How much heat does it discharge per cycle?arrow_forwardAn engine absorbs three times as much heat as it discharges. The work done by the engine per cycle is 50 J. Calculate (a) the efficiency of the engine, (b) the heat absorbed per cycle, and (c) the heat discharged per cycle.arrow_forwardAre the entropy changes of the system in the following processes positive or negative? (a) water vapor that condenses on a cold surface; (b) gas in a that leaks into the surrounding atmosphere; (c) an ice cube that melts in a glass of lukewarm water; (d)the lukewarm water of part (c); a real heat engine performing a cycle; (f) food cooled in a refrigerator.arrow_forward
- Use a PV diagram such as the one in Figure 22.2 (page 653) to figure out how you could modify an engine to increase the work done.arrow_forwardConsider two actual power plants operating with solar energy. Energy is supplied to one plant from a solar pond at 80°C and to the other from concentrating collectors that raise the water temperature to 600°C. Which of these power plants will have a higher efficiency? Explain.arrow_forwardThe temperature of the cold reservoir of the engine is 300 K. It has an efficiency of 0.30 and absorbs 500 J of heat per cycle. (a) How much work does it perform per cycle? (b) How much heat does it discharge per cycle?arrow_forward
- A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into a room per cycle. How much work is required in each cycle?arrow_forwardT=33°C Question of the Day Consider a person who emits 100W of heat in a house. The temperature outside is on average 33°C. He turns on the AC to keep the indoor temperature at Tc = 23°C for 8 hours a day. Question: 100W T (a) If the AC is running a Carnot cycle, find the COP of the AC operates at (i) T = 23°C; and (ii) TC = 25°C (b) Estimate how much energy in percentage he can save per day if he sets the indoor temperature to 25°C instead. Energy saved in % = Energy spent at 23°C – Energy spent at 25°C Energy spent at 23°C Hints: 1. The answer actually depends on how efficient the AC device is, but we can assume the AC is the most efficient AC which runs in Carnot Cycle. 2. Assume that electricity power convert 100% to power in the compressor of the AC.arrow_forwardCalculate the work done in Joules by an engine during this reversible cycle. 9 p(atm) 2 8 7 6 5 4 3 2 1 -1 1 4 6 2 3 8 V(L) 10arrow_forward
- 1. a) A heat engine with an efficiency of 25% does 600 J of work in each cycle. How much heat must be supplied from the high-temperature source in each cycle? b) A heat engine with an efficiency of 40% takes in 800 J of heat from the high-temperature reservoir in each cycle. How much work does the engine do in each cycle? How much heat is released to the low-temperature reservoir?arrow_forwardWhy are engineers interested in reversible processes even though they can never be achieved?arrow_forwardA 100-W lightbulb is placed in a cylinder equipped with a moveable piston. The lightbulb is turned on for 0.015 hour, and the assembly expands from an initial volume of 0.85 L to a final volume of 5.88 L against an external pressure of 1.0 atm. Use the wattage of the lightbulb and the time it is on to calculate ΔE in joules (assume that the cylinder and lightbulb assembly is the system and assume two significant figures). Calculate w and q.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers
Physics
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...
Physics
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
The Second Law of Thermodynamics: Heat Flow, Entropy, and Microstates; Author: Professor Dave Explains;https://www.youtube.com/watch?v=MrwW4w2nAMc;License: Standard YouTube License, CC-BY