You want to design an ideal Carnot heat engine that wastes only 35.0% of the heat that goes into it. The lowest cold-reservoir temperature available to you is +15.0°C. If 150.0 J of work is done per cycle, the heat input per cycle is closest to

The heat input per cycle is closest to 230.8 J

Explanation:

Given;

percentage of energy waste = 35%

The lowest cold-reservoir temperature = 15.0°C

useful work done in the reservoir per cycle = 150.0 J

To design an ideal Carnot heat engine that wastes only 35.0% of the heat that goes into it.

If 35% of heat input = wasted work, then

65 % of heat input  = useful work

∴ 0.65 ×  heat input = 150

heat input = 150/0.65

heat input = 230.8 J

Therefore, the heat input per cycle is closest to 230.8 J

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