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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Chapter 11, Problem 29P
A newly proposed device for generating electricity from the sun is a
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A newly proposed device for generating electricity from the sun is a heat engine in which the hot reservoir is created by focusing sunlight on a small spot on one side of the engine. The cold reservoir is ambient air at 20°C. The designer claims that the efficiency will be 60%. What minimum hot-reservoirtemperature, in °C, would be required to produce this efficiency?
The Mach 5 racer driven by Speed Racer has an engine that pulls 14250J of heat energy from a high temperature reservoir held at 1069°C to do 2985J of usable work. a) What is the efficiency of the Mach 5’s engine? b) If the ideal efficiency of the heat engine is 0.675, what is the temperature of the low temperature reservoir in degrees Kelvin?
Q1: A particular power plant operates with a heat-source reservoir at 370°C and a
heat sink reservoir at 50°C. It has a thermal efficiency equal to 60% of the Carnot-
engine thermal efficiency for the same temperatures.
(a) What is the thermal efficiency of the plant?
(b) To what temperature must the heat-source reservoir be raised to increase the
thermal efficiency of the plant to 40%? Again n is 60% of the Carnot-engine value.
(c) For part (a) If the discarded heat is 2000000kw what is the work?
Chapter 11 Solutions
College Physics: A Strategic Approach (3rd Edition)
Ch. 11 - Rub your hands together vigorously. What happens?...Ch. 11 - Describe the energy transfers and transformations...Ch. 11 - According to Table 11.4, cycling at 15 km/h...Ch. 11 - Prob. 4CQCh. 11 - For most automobiles, the number of miles per...Ch. 11 - A glassblower heats up a blob of glass in a...Ch. 11 - When the space shuttle returns to earth, its...Ch. 11 - Prob. 8CQCh. 11 - Prob. 9CQCh. 11 - A 20 kg block of steel at 23C and a 150 g piece of...
Ch. 11 - Prob. 11CQCh. 11 - For Questions 12 through 17, give a specific...Ch. 11 - For Questions 12 through 17, give a specific...Ch. 11 - For Questions 12 through 17, give a specific...Ch. 11 - For Questions 12 through 17, give a specific...Ch. 11 - For Questions 12 through 17, give a specific...Ch. 11 - For Questions 12 through 17, give a specific...Ch. 11 - A fire pistonan impressive physics...Ch. 11 - Prob. 19CQCh. 11 - A drop of green ink falls into a beaker of clear...Ch. 11 - Prob. 21CQCh. 11 - Prob. 22CQCh. 11 - According to the second law of thermodynamics, it...Ch. 11 - Assuming improved materials and better processes,...Ch. 11 - Electric vehicles increase speed by using an...Ch. 11 - When the suns light hits the earth, the...Ch. 11 - When you put an ice cube tray filled with liquid...Ch. 11 - Prob. 28CQCh. 11 - A person is walking on level ground at constant...Ch. 11 - A person walks 1 km, turns around, and runs back...Ch. 11 - Prob. 31MCQCh. 11 - 200 J of heat is added to two gases, each in a...Ch. 11 - An inventor approaches you with a device that he...Ch. 11 - Prob. 34MCQCh. 11 - Prob. 35MCQCh. 11 - A refrigerators freezer compartment is set at 10C;...Ch. 11 - A 10% efficient engine accelerates a 1500 kg car...Ch. 11 - Prob. 2PCh. 11 - A typical photovoltaic cell delivers 4.0 103 W of...Ch. 11 - Prob. 4PCh. 11 - A fast-food hamburger (with cheese and bacon)...Ch. 11 - In an average human, basic life processes require...Ch. 11 - An energy bar contains 6.0 g of fat. How much...Ch. 11 - An energy bar contains 22 g of carbohydrates. How...Ch. 11 - Prob. 9PCh. 11 - An energy bar contains 22 g of carbohydrates. If...Ch. 11 - Suppose your body was able to use the chemical...Ch. 11 - The label on a candy bar says 400 Calories....Ch. 11 - A weightlifter curls a 30 kg bar, raising it each...Ch. 11 - Prob. 14PCh. 11 - Prob. 15PCh. 11 - The planet Mercurys surface temperature varies...Ch. 11 - A piece of metal at 100C has its Celsius...Ch. 11 - Prob. 18PCh. 11 - 500 J of work are done on a system in a process...Ch. 11 - 600 J of heat energy are transferred to a system...Ch. 11 - 300 J of energy are transferred to a system in the...Ch. 11 - 10 J of heat are removed from a gas sample while...Ch. 11 - A heat engine extracts 55 kJ from the hot...Ch. 11 - A heat engine does 20 J of work while exhausting...Ch. 11 - A heat engine does 200 J of work while exhausting...Ch. 11 - A heat engine with an efficiency of 40% does 100 J...Ch. 11 - A power plant running at 35% efficiency generates...Ch. 11 - A heat engine operating between energy reservoirs...Ch. 11 - A newly proposed device for generating electricity...Ch. 11 - Converting sunlight to electricity with solar...Ch. 11 - A refrigerator takes in 20 J of work and exhausts...Ch. 11 - Air conditioners are rated by their coefficient of...Ch. 11 - 50 J of work are done on a refrigerator with a...Ch. 11 - Find the maximum possible coefficient of...Ch. 11 - Which, if any, of the heat engines in Figure...Ch. 11 - Which, if any, of the refrigerators in Figure...Ch. 11 - Prob. 37PCh. 11 - Prob. 38GPCh. 11 - Prob. 39GPCh. 11 - For how long would a 68 kg athlete have to swim at...Ch. 11 - a. How much metabolic energy is required for a 68...Ch. 11 - Prob. 42GPCh. 11 - Prob. 43GPCh. 11 - The record time for a Tour de France cyclist to...Ch. 11 - Championship swimmers take about 22 s and about 30...Ch. 11 - A 68 kg hiker walks at 5.0 km/h up a 7% slope....Ch. 11 - A 70 kg student consumes 2500 Cal each day and...Ch. 11 - To make your workouts more productive, you can get...Ch. 11 - The resistance of an exercise bike is often...Ch. 11 - Prob. 50GPCh. 11 - Prob. 51GPCh. 11 - A large horse can perform work at a steady rate of...Ch. 11 - A heat engine with a high-temperature reservoir at...Ch. 11 - An engine does 10 J of work and exhausts 15 J of...Ch. 11 - The heat exhausted to the cold reservoir of an...Ch. 11 - An engine operating at maximum theoretical...Ch. 11 - Some heat engines can run on very small...Ch. 11 - The coefficient of performance of a refrigerator...Ch. 11 - An engineer claims to have measured the...Ch. 11 - A 32% efficient electric power plant produces 900...Ch. 11 - A typical coal-fired power plant burns 300 metric...Ch. 11 - Each second, a nuclear power plant generates 2000...Ch. 11 - Prob. 63GPCh. 11 - Prob. 64GPCh. 11 - Air conditioners sold in the United States are...Ch. 11 - The surface waters of tropical oceans are at a...Ch. 11 - The light energy that falls on a square meter of...Ch. 11 - MCAT-Style Passage Problems Kangaroo Locomotion...Ch. 11 - MCAT-Style Passage Problems Kangaroo Locomotion...Ch. 11 - MCAT-Style Passage Problems Kangaroo Locomotion...Ch. 11 - MCAT-Style Passage Problems Kangaroo Locomotion...Ch. 11 - MCAT-Style Passage Problems Kangaroo Locomotion...
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