Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 19, Problem 11P
To determine
The COP of Carnot engine.
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The 2nd Law of Thermodynamics claims that the most efficient Carnot engine is achieved with the lowest T of cold sink and the highest T of hot source that exists in real life. The efficiency of this carnot engine is:
a. 0.1
b. 1.0
c. 0.3
d. 0.5
A certain gasoline engine has an efficiency of 32.0%. What would the hot reservoir temperature (in °C) be for a Carnot engine having that efficiency, if it operates with a cold reservoir temperature of 210°C?
The efficiency of a Carnot engine is 29.3%. What is the temperature of the cold reservoir if the temperature of the hot reservoir is 425 K?
Chapter 19 Solutions
Physics for Scientists and Engineers
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- A Carnot engine has an efficiency of 0.60. When the temperature of its cold reservoir the efficiency drops to 0.55. If initially Tc=27, determine (a) the constant value of Th and (b) the final value of Tc.arrow_forwardHow could you design a Carnot engine with 100% efficiency?arrow_forwardA car salesperson claims that a 300-hp engine is a necessary option in a compact car, in place of the conventional 130-hp engine. Suppose you intend to drive the car within speed limits ( 65 mi/h) on flat terrain. How would you counter this sales pitch?arrow_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_forwardOf the following, which is not a statement of the second law of thermodynamics? (a) No heat engine operating in a cycle can absorb energy from a reservoir and use it entirely to do work, (b) No real engine operating between two energy reservoirs can be more efficient than a Carnot engine operating between the same two reservoirs, (c) When a system undergoes a change in state, the change in the internal energy of the system is the sum of the energy transferred to the system by heat and the work done on the system, (d) The entropy of the Universe increases in all natural processes, (e) Energy will not spontaneously transfer by heat from a cold object to a hot object.arrow_forwardConsider these scenarios and state whether work is done by the system on the environment (SE) or by the environment on the system (ES): (a) opening a carbonated beverage; (b) filling a flat tire; (c) a sealed empty gas can expands on a hot day, bowing out the walls.arrow_forward
- True or False: The entropy change in an adiabatic process must be zero because Q = 0.arrow_forwardWhich of the following is true for the entropy change of a system that undergoes a reversible, adiabatic process? (a) S 0 (b) S = 0 (c) S 0arrow_forwardA Carnot engine has an efficiency of 30% when the temperature of the sink is 122⁰ F. Then the efficiency is increased to70% by changing the source temperature only. What is the change in temperature of the source?arrow_forward
- A Carnot engine operates between the temperatures Th = 100°C and Tc = 23°C. By what factor does the theoretical efficiency increase if the temperature of the hot reservoir is increased to 460°C?arrow_forwardA Carnot engine has two temperature baths. One is at 400 degrees Celsius, and the other is at 30 degrees Celsius. What is the efficiency of the engine?arrow_forwardA certain Carnot engine was built in a laboratory. The lab technicians found out that if the temperature of the cold reservoir is kept at 295 K, the efficiency of the engine is 26.0%. If the hot reservoir is kept at constant temperature, at what temperature must the cold reservoir be set, so that the efficiency of the engine is increased to 33.0%?arrow_forward
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