Please choose the answer and state why it is the answer. Which of the following statements is NOT a correct assumptionof the classical model of an ideal gas? (A) The molecules are in random motion. (B) The volume of the molecules is negligible compared withthe volume occupied by the gas. (C) The molecules obey Newton's laws of motion. (D) The collisions between molecules are inelastic. (E) The only appreciable forces on the molecules are thosethat occur during collisions. In each cycle of a Carnot engine, 100 joules of heat isabsorbed from the high temperature reservoir and 60 joules isexhausted to the low temperature reservoir. What is theefficiency of the engine? (A) 40% (B) 60% (C) 67% (D) 150% (E) 167% Please choose the answer and state why it is the answer. Which of the following statements is NOT a correct assumptionof the classical model of an ideal gas? (A) The molecules are in random motion. (B) The volume of the molecules is negligible compared withthe volume occupied by the gas. (C) The molecules obey Newton's laws of motion. (D) The collisions between molecules are inelastic. (E) The only appreciable forces on the molecules are thosethat occur during collisions. In each cycle of a Carnot engine, 100 joules of heat isabsorbed from the high temperature reservoir and 60 joules isexhausted to the low temperature reservoir. What is theefficiency of the engine? (A) 40% (B) 60% (C) 67% (D) 150% (E) 167%
Explanation / Answer
option ( D ) is answer i.e.,The collisions between molecules are inelastic. (b). heat is absorbed from the high temperature reservoirQ = 100 J heat exhausted to the low temperature reservoirQ '= 60 J The efficiency of the engine n = 1-( Q '/Q ) = 1-(60/100) = 40/ 100 =0.4 =0.4 * 100 = 40 %