AP Physics 2mediummcq1 pt
A heat engine's efficiency is limited below 100% because
A.some heat must be rejected to a cold reservoir
B.fuel is always wet
C.engines waste no heat
D.work cannot be measured
Explanation
Core Concept
The second law requires heat rejection, capping efficiency.
Correct Answer
Asome heat must be rejected to a cold reservoir
More Unit 2: Thermodynamics practice questions
- hardA Carnot engine's efficiency approaches 100% only if
- mediumA 1.0 kg block of aluminum (c = 900 J/kg·K) cools from 80 °C to 20 °C. The heat released is
- hardThe net work of a cyclic process equals
- hardA gas molecule's average speed doubles when its absolute temperature
- mediumWhich statement about temperature scales is correct?
Practice more AP Physics 2 questions with full explanations
Practice Unit 2: Thermodynamics Questions →