핵심물리학2 전기파트 19단원 레포트답안

핵심물리학2 전기파트 19단원 레포트답안

핵심물리학2 전기파트 19단원 레포트답안.doc

본문 EXERCISES Sections 19.2 and 19.3 The Second Law of Thermodynamics and Its Applications 14. The efficiency of a reversible engine, operating between two absolute temperatures, is given by Equation 19.3. (a) (b) (c) With room temperature at 15. INTERPRET This problem is about the thermal efficiency of a heat engine. DEVELOP If it were a reversible engine, its efficiency would be that of a Carnot engine, given by Equation 19.3: EVALUATE Substituting the values given in the problem, we obtain ASSESS The engine efficiency is almost 100%. This is too good to be true. 16. We can solve Equation 19.3 for the low temperature to find 17. INTERPRET This problem is about a Carnot engine that operates via the Carnot cycle. DEVELOP The efficiency of an engine, by definition is, where are the work done and heat absorbed per cycle. EVALUATE (a) From the equation above, the efficiency of the engine is (b) are related to the heat rejected per cycle by the first law of thermodynamics (since per cycle is zero). The relation is (c) For a Carnot engine operating between two temperatures, so ASSESS The maximum temperature is greater than as our calculation confirms. Note that Carnot's theorem applies to the ratio of absolute temperatures. 18. From Equation 19.4, 19. INTERPRET This problem is about the work done by a refrigerator to freeze water. Heat of transformation is involved in the phase change. DEVELOP The amount of heat that must be extracted in order to freeze the water is 하고 싶은 말 좀 더 업그레이드하여 자료를 보완하여, 과제물을 꼼꼼하게 정성을 들어 작성했습니다. 위 자료 요약정리 잘되어 있으니 잘 참고하시어 학업에 나날이 발전이 있기를 기원합니다 ^^ 구입자 분의 앞날에 항상 무궁한 발전과 행복과 행운이 깃들기를 홧팅 키워드 단원, 핵심, 레포트답안, 전기파트, 핵심물리학, 물리학