일반물리학 1 — Entropy and the Second Law of Thermodynamics: Problem 6

6 The electric motor of a heat pump transfers energy as heat from the outdoors, which is at $-10^\circ\text{C}$, to a room that is at $17^\circ\text{C}$. If the heat pump were a Carnot heat pump (a Carnot engine working in reverse), how much energy would be transferred as heat to the room for each joule of electric energy consumed?