Question
Physics Question on Thermodynamics
A heat engine operates between a cold reservoir and a hot reservoir. The engine takes 200 J of heat from the hot reservoir and has the efficiency of 0.4. The amount of heat delivered to the cold reservoir in a cycle is:
A
100 J
B
120 J
C
140 J
D
160 J
E
80 J
Answer
120 J
Explanation
Solution
The correct answer is (B):120 J