Problem 1CQ: Rub your hands together vigorously. What happens? Discuss the energy transfers and transformations... Problem 2CQ: Describe the energy transfers and transformations that occur from the time you sit down to breakfast... Problem 3CQ: According to Table 11.4, cycling at 15 km/h requires less meta-bolic energy than running at 15 km/h.... Problem 4CQ Problem 5CQ: For most automobiles, the number of miles per gallon decreases as highway speed increases. Fuel... Problem 6CQ: A glassblower heats up a blob of glass in a furnace, increasing its temperature by 1000C. By how... Problem 7CQ: When the space shuttle returns to earth, its surfaces get very hot as it passes through the... Problem 8CQ Problem 9CQ Problem 10CQ: A 20 kg block of steel at 23C and a 150 g piece of brass at 520C are placed in contact inside an... Problem 11CQ Problem 12CQ: For Questions 12 through 17, give a specific example of a process that has the energy changes and... Problem 13CQ: For Questions 12 through 17, give a specific example of a process that has the energy changes and... Problem 14CQ: For Questions 12 through 17, give a specific example of a process that has the energy changes and... Problem 15CQ: For Questions 12 through 17, give a specific example of a process that has the energy changes and... Problem 16CQ: For Questions 12 through 17, give a specific example of a process that has the energy changes and... Problem 17CQ: For Questions 12 through 17, give a specific example of a process that has the energy changes and... Problem 18CQ: A fire pistonan impressive physics demonstrationignites a fire without matches. The operation is... Problem 19CQ Problem 20CQ: A drop of green ink falls into a beaker of clear water. First describe what happens. Then explain... Problem 21CQ Problem 22CQ Problem 23CQ: According to the second law of thermodynamics, it is impossible for a heat engine to convert thermal... Problem 24CQ: Assuming improved materials and better processes, can engineers ever design a heat engine that... Problem 25CQ: Electric vehicles increase speed by using an electric motor that draws energy from a battery. When... Problem 26CQ: When the suns light hits the earth, the temperature rises. Is there an entropy change to accompany... Problem 27CQ: When you put an ice cube tray filled with liquid water in your freezer, the water eventually becomes... Problem 28CQ Problem 29MCQ: A person is walking on level ground at constant speed. What energy transformation is taking place?... Problem 30MCQ: A person walks 1 km, turns around, and runs back to where he started. Compare the energy used and... Problem 31MCQ Problem 32MCQ: 200 J of heat is added to two gases, each in a sealed container. Gas 1 is in a rigid container that... Problem 33MCQ: An inventor approaches you with a device that he claims will take 100 J of thermal energy input and... Problem 34MCQ Problem 35MCQ Problem 36MCQ: A refrigerators freezer compartment is set at 10C; the kitchen is 24C. What is the theoretical... Problem 1P: A 10% efficient engine accelerates a 1500 kg car from rest to 15 m/s. How much energy is transferred... Problem 2P Problem 3P: A typical photovoltaic cell delivers 4.0 103 W of electric energy when illuminated with 1.2 101 W... Problem 4P Problem 5P: A fast-food hamburger (with cheese and bacon) contains 1000 Calories. What is the burgers energy in... Problem 6P: In an average human, basic life processes require energy to be supplied at a steady rate of 100 W.... Problem 7P: An energy bar contains 6.0 g of fat. How much energy is this in joules? In calories? In Calories? Problem 8P: An energy bar contains 22 g of carbohydrates. How much energy is this in joules? In calories? In... Problem 9P Problem 10P: An energy bar contains 22 g of carbohydrates. If the energy bar was his only fuel, how far could a... Problem 11P: Suppose your body was able to use the chemical energy in gasoline. How far could you pedal a bicycle... Problem 12P: The label on a candy bar says 400 Calories. Assuming a typical efficiency for energy use by the... Problem 13P: A weightlifter curls a 30 kg bar, raising it each time a distance of 0.60 m. How many times must he... Problem 14P Problem 15P Problem 16P: The planet Mercurys surface temperature varies from 700 K during the day to 90 K at night. What are... Problem 17P: A piece of metal at 100C has its Celsius temperature doubled. By what factor does its kelvin... Problem 18P Problem 19P: 500 J of work are done on a system in a process that decreases the systems thermal energy by 200 J.... Problem 20P: 600 J of heat energy are transferred to a system that does 400 J of work. By how much does the... Problem 21P: 300 J of energy are transferred to a system in the form of heat while the thermal energy increases... Problem 22P: 10 J of heat are removed from a gas sample while it is being compressed by a piston that does 20 J... Problem 23P: A heat engine extracts 55 kJ from the hot reservoir and exhausts 40 kJ into the cold reservoir. What... Problem 24P: A heat engine does 20 J of work while exhausting 30 J of waste heat. What is the engines efficiency? Problem 25P: A heat engine does 200 J of work while exhausting 600 J of heat to the cold reservoir. What is the... Problem 26P: A heat engine with an efficiency of 40% does 100 J of work. How much heat is (a) extracted from the... Problem 27P: A power plant running at 35% efficiency generates 300 MW of electric power. At what rate (in MW) is... Problem 28P: A heat engine operating between energy reservoirs at 20C and 600C has 30% of the maximum possible... Problem 29P: A newly proposed device for generating electricity from the sun is a heat engine in which the hot... Problem 30P: Converting sunlight to electricity with solar cells has an efficiency of 15%. Its possible to... Problem 31P: A refrigerator takes in 20 J of work and exhausts 50 J of heat. What is the refrigerators... Problem 32P: Air conditioners are rated by their coefficient of performance at 80F inside temperature and 95F... Problem 33P: 50 J of work are done on a refrigerator with a coefficient of performance of 4.0. How much heat is... Problem 34P: Find the maximum possible coefficient of performance for a heat pump used to heat a house in a... Problem 35P: Which, if any, of the heat engines in Figure P11.35 below violate (a) the first law of... Problem 36P: Which, if any, of the refrigerators in Figure P11.36 below violate (a) the first law of... Problem 37P Problem 38GP Problem 39GP Problem 40GP: For how long would a 68 kg athlete have to swim at a fast crawl to use all the energy available in a... Problem 41GP: a. How much metabolic energy is required for a 68 kg runner to run at a speed of 15 km/h for 20 min?... Problem 42GP Problem 43GP Problem 44GP: The record time for a Tour de France cyclist to ascend the famed 1100-m-high Alpe dHuez was 37.5... Problem 45GP: Championship swimmers take about 22 s and about 30 arm strokes to move through the water in a 50 m... Problem 46GP: A 68 kg hiker walks at 5.0 km/h up a 7% slope. What is the necessary metabolic power? Hint: You can... Problem 47GP: A 70 kg student consumes 2500 Cal each day and stays the same weight. One day, he eats 3500 Cal and,... Problem 48GP: To make your workouts more productive, you can get an electrical generator that you drive with the... Problem 49GP: The resistance of an exercise bike is often provided by a generator; that is, the energy that you... Problem 50GP Problem 51GP Problem 52GP: A large horse can perform work at a steady rate of about 1 horsepower, as you might expect. a.... Problem 53GP: A heat engine with a high-temperature reservoir at 400 K has an efficiency of 0.20. What is the... Problem 54GP: An engine does 10 J of work and exhausts 15 J of waste heat. a. What is the engine's efficiency? b.... Problem 55GP: The heat exhausted to the cold reservoir of an engine operating at maximum theoretical efficiency is... Problem 56GP: An engine operating at maximum theoretical efficiency whose cold-reservoir temperature is 7C is 40%... Problem 57GP: Some heat engines can run on very small temperature differences. One manufacturer claims to have a... Problem 58GP: The coefficient of performance of a refrigerator is 5.0. a. If the compressor uses 10 J of energy,... Problem 59GP: An engineer claims to have measured the characteristics of a heat engine that takes in 100 J of... Problem 60GP: A 32% efficient electric power plant produces 900 MJ of electric energy per second and discharges... Problem 61GP: A typical coal-fired power plant burns 300 metric tons of coal every hour to generate 2.7 106 MJ of... Problem 62GP: Each second, a nuclear power plant generates 2000 MJ of thermal energy from nuclear reactions in the... Problem 63GP Problem 64GP Problem 65GP: Air conditioners sold in the United States are given a seasonal energy-efficiency ratio (SEER)... Problem 66GP: The surface waters of tropical oceans are at a temperature of 27C while water at a depth of 1200 m... Problem 67GP: The light energy that falls on a square meter of ground over the course of a typical sunny day is... Problem 68MSPP: MCAT-Style Passage Problems Kangaroo Locomotion Kangaroos have very stout tendons in their legs that... Problem 69MSPP: MCAT-Style Passage Problems Kangaroo Locomotion Kangaroos have very stout tendons in their legs that... Problem 70MSPP: MCAT-Style Passage Problems Kangaroo Locomotion Kangaroos have very stout tendons in their legs that... Problem 71MSPP: MCAT-Style Passage Problems Kangaroo Locomotion Kangaroos have very stout tendons in their legs that... Problem 72MSPP: MCAT-Style Passage Problems Kangaroo Locomotion Kangaroos have very stout tendons in their legs that... format_list_bulleted