The operating temperatures for a Carnot engine are $T_{\mathrm{c}}$ and $T_{\mathrm{h}}=T_{\mathrm{c}}+55 \mathrm{~K}$. The efficiency of the engine is $11 \%$. Find $T_{\mathrm{c}}$ and $T_{\mathrm{h}}$.

During each cycle a reversible engine absorbs $2500 \mathrm{~J}$ of heat from a high-temperature reservoir and performs $2200 \mathrm{~J}$ of work. How much heat is exhausted to the low-temperature reservoir during each cycle?

The Ivanpah Solar Electric Generating System is the largest solar thermal power-tower facility in the world. It collects $1321 \mathrm{MW}$ of solar thermal energy to heat special collectors to $566{ }^{\circ} \mathrm{C}$. The thermal energy is then used to make steam to operate an electric generator. (a) Find the maximum efficiency of the power plant, taking the cold reservoir to be the surrounding environment at $12^{\circ} \mathrm{C}$. (b) How much mechanical work (electricity) could the facility generate if it operated at its maximum efficiency? (c) If the facility generates $392 \mathrm{MW}$ of electricity, Find its actual efficiency?

The Ivanpah Solar Electric Generating System is the largest solar thermal power-tower facility in the world. It collects $1321 \mathrm{MW}$ of solar thermal energy to heat special collectors to $566{ }^{\circ} \mathrm{C}$. The thermal energy is then used to make steam to operate an electric generator. How much mechanical work (electricity) could the facility generate if it operated at its maximum efficiency?

The efficiency of a particular Carnot engine is $0.280$. (a) If the high-temperature reservoir is at a temperature of $565 \mathrm{~K}$, what is the temperature of the low-temperature reservoir? (b) Io increase the efficiency of this engine to $40.0 \%$, must the temperature of the low-temperature reservoir be increased or decreased? Explain. (c) Find the temperature of the low-temperature reservoir that gives an efficiency of $0.400$.

During each cycle a reversible engine absorbs $2500 \mathrm{~J}$ of heat from a high-temperature reservoir and performs $2200 \mathrm{~J}$ of work. What is the efficiency of this engine?