Question

the diagram shows a heat engine. in which area of the diagram is unusable thermal energy detected? o w o x o y o z

Explanation:

Step1: Understand heat - engine concept

In a heat - engine, unusable thermal energy is rejected to a low - temperature reservoir.

Step2: Analyze diagram areas

Area Y is typically where the heat engine rejects the waste (unusable) thermal energy to the surroundings.

Answer:

Y