23. The Second Law of Thermodynamics

Heat Engines and the Second Law of Thermodynamics

23. The Second Law of Thermodynamics

Heat Engines and the Second Law of Thermodynamics

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phys2A ch15.7-8 The Second Law of Thermodynamics and Heat Engines

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phys2A ch15.7-8 The Second Law of Thermodynamics and Heat Engines

Heat engines and the 2nd law

Heat Engines and the Second Law of Thermodynamics

Second Law Thermodynamics, Heat Engines, Efficiency, Carnot Heat Engine

First and Second Law of Thermodynamics and the Heat Engine

Lesson 8 - Heat Engines And 2nd Law of Thermodynamics (Physics Tutor)

Heat Engines And Second Law Of Thermodynamics

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Multiple Choice

An aircraft engine takes in 9 kJ of heat and expels 6.4 kJ of heat each cycle. How much mechanical work does the engine do each cycle?

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Multiple Choice

A heat engine uses a tank of ice water as a cold reservoir. The engine takes in 8 kJ of heat from the hot reservoir, and the heat expelled melts 18g of ice in the tank. How much work does this engine do?

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Multiple Choice

A steam turbine takes in 75g of water and boils it as heat energy to run a 40% efficient engine. How much work does this engine do per cycle?

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Multiple Choice

A heat engine exhausts

250 J

per cycle while doing

200 J

of work. What is the efficiency of this engine?

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Multiple Choice

In each cycle, a heat engine absorbs

1200 J

from a 400°C hot reservoir, emits

700 J

to 80°C cold reservoir, while doing

500 J

of work. Is it physically possible for this engine to exist?

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Multiple Choice

In each cycle, a heat engine absorbs

1200 J

from a 400°C hot reservoir, emits

600 J

to 80°C cold reservoir, while doing

600 J

of work. Is it physically possible for this engine to exist?

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Multiple Choice

Your car's engine can be modeled as a heat engine. How many joules must be extracted from your gas tank to get your

1200 kg

car to 26 m/s? Assume the thermal efficiency of your car is 16%. Ignore air resistance and other frictional effects on your car.

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Textbook Question

A Carnot refrigerator is operated between two heat reservoirs at temperatures of 320 K and 270 K. (c) What is the coefficient of performance of the refrigerator?

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Textbook Question

A Carnot refrigerator is operated between two heat reservoirs at temperatures of 320 K and 270 K. (b) If the refrigerator completes 165 cycles each minute, what power input is required to operate it?

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Textbook Question

A Carnot refrigerator is operated between two heat reservoirs at temperatures of 320 K and 270 K. (a) If in each cycle the refrigerator receives 415 J of heat energy from the reservoir at 270 K, how many joules of heat energy does it deliver to the reservoir at 320 K?

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Textbook Question

A diesel engine performs 2200 J of mechanical work and discards 4300 J of heat each cycle. (a) How much heat must be supplied to the engine in each cycle?

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Textbook Question

A Carnot refrigerator operates between energy reservoirs at 0℃ and 250℃. A 2.4-cm-diameter, 50-cm-long copper bar connects the two energy reservoirs. At what rate, in W, must work be done on the refrigerator to remove heat from the cold reservoir at the same rate that it arrives through the copper bar?

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Textbook Question

An ideal refrigerator utilizes a Carnot cycle operating between 0℃ and 25℃. To turn 10 kg of liquid water at 0℃ into 10 kg of ice at 0℃, (a) how much heat is exhausted into the room and (b) how much energy must be supplied to the refrigerator?

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Textbook Question

A Carnot engine operates between temperatures of 5℃ and 500℃. The output is used to run a Carnot refrigerator operating between -5℃ and 25℃. How many joules of heat energy does the refrigerator exhaust into the room for each joule of heat energy used by the heat engine?

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Textbook Question

FIGURE P21.46 shows a Carnot heat engine driving a Carnot refrigerator. a. Determine Q₂, Q₃ and Q₄.

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Textbook Question

A typical coal-fired power plant burns 300 metric tons of coal every hour to generate 750 MW of electricity. 1 metric ton = 1000 kg. The density of coal is 1500 kg/m³ and its heat of combustion is 28 MJ/kg. Assume that all heat is transferred from the fuel to the boiler and that all the work done in spinning the turbine is transformed into electric energy. a. Suppose the coal is piled up in a 10 m ✕ 10 m room. How tall must the pile be to operate the plant for one day?

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23. The Second Law of Thermodynamics

Heat Engines and the Second Law of Thermodynamics

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