An engine absorbs of heat from a furnace at and delivers of work per cycle

PHYSICS · Subjective · A Level · Physics · Engineering physics · Engineering physics

Problem

An engine absorbs

5.0 \times 10^{3}\,\text{J}

of heat from a furnace at

600\,\text{K}

and delivers

2.0 \times 10^{3}\,\text{J}

of work per cycle. The rejected heat from the engine goes to the surrounding air at

300\,\text{K}

. The entire

2.0 \times 10^{3}\,\text{J}

of work runs a refrigerator that removes

1.2 \times 10^{3}\,\text{J}

of heat from a cold chamber at

270\,\text{K}

and expels it to the same air at

300\,\text{K}

each cycle. Determine the total entropy change of the universe for one combined engine–refrigerator cycle.