A refrigerator removes of heat from a compartment at and rejects it to the…

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering 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}

(b)

400\,\text{J}

(c)

45\,\text{J}

(d)

40\,\text{J}