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?

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.

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?

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?

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?

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?