A small stationary engine runs in a repeating cycle

PHYSICS · Multi-part · Fermi University Physics · Thermal, Statistical & Complex Systems · The laws of thermodynamics · The laws of thermodynamics

Thermal Physics, Ch Heat engines, refrigerators and the Carnot cycle

Problem

A small stationary engine runs in a repeating cycle. In each cycle it absorbs

Q_h = 2500\,\mathrm{J}

of heat from a hot reservoir and rejects

Q_c = 1700\,\mathrm{J}

of heat to a cold reservoir. Both bodies are large enough to count as reservoirs, and the engine returns to the same state at the end of every cycle, so its internal energy is unchanged over a cycle. All the heats are quoted as magnitudes. ((a)) Find the efficiency

e

of the engine. ((b)) Find the work

W_{\rm out}

delivered by the engine per cycle.

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