Physics

Problem

A refrigerator removes

400\,\text{J}

of heat from a compartment at

-5^{\circ}\text{C}

and rejects it to the surroundings at

25^{\circ}\text{C}

during each cycle. Assuming an ideal (reversible) operation, the minimum mechanical work that must be supplied per cycle is closest to a)

30\,\text{J}

400\,\text{J}

45\,\text{J}

40\,\text{J}