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?

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

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?

A heat engine exhausts $250\mathrm{J}$ per cycle while doing $200\mathrm{J}$ of work. What is the efficiency of this engine?

In each cycle, a heat engine absorbs $1200\mathrm{J}$ from a 400°C hot reservoir, emits $700\mathrm{J}$ to 80°C cold reservoir, while doing $500\mathrm{J}$ of work. Is it physically possible for this engine to exist?

In each cycle, a heat engine absorbs $1200\mathrm{J}$ from a 400°C hot reservoir, emits $600\mathrm{J}$ to 80°C cold reservoir, while doing $600\mathrm{J}$ of work. Is it physically possible for this engine to exist?

Your car's engine can be modeled as a heat engine. How many joules must be extracted from your gas tank to get your $1200\mathrm{kg}$ car to 26 m/s? Assume the thermal efficiency of your car is 16%. Ignore air resistance and other frictional effects on your car.