College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

تمرين 77

An engineer redesigns a heat engine and improves its thermal efficiency from 20% to 25%. (a) Does the ratio of the heat input to heat output (1) increase, (2) remain the same, or (3) decrease Explain. (b) What is the engine's change in Q h / Q c