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【简答题】
有一飞机的弹射装置，如图2-2，在气缸内装有压缩空气，初始体积为0.28m3，终了体积为0.99m3，飞机的发射速度为61m/s，活塞、连杆和飞机的总质量为2722kg。设发射过程进行很快，压缩空气和外界间无传热现象，若不计摩擦力，求发射过程中压缩空气的热力学能变化。
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举一反三
【单选题】按照热力学上通常的规定，下列反应中ΔrHm和生成物的ΔfHm相等的是…( )
A.
(s)+CO2(g) →CaCO3
B.
6Li(s)+N2(g) →2Li3N(s)
C.
1/2H2(g)+1/2Br2(l) →HBr(g)
D.
2H2(g)+ O2(g)→2H2O(g)
【简答题】质量为M的快艇携带一颗质量为m的鱼雷，两者一起以速度v向前运动．快艇沿前进方向发射鱼雷后，速度减为原来的 1 3 ，不计水的阻力，则鱼雷的发射速度为（ ）
A.
2M+3m 3m v
B.
2M 3m v
C.
4M-m 3m v
D.
4M 3m v
【单选题】热力学中平衡态指______。
A.
系统宏观性质不随时间改变的状态
B.
没有外界作用时系统宏观性质不随时间改变的状态
C.
外界作用不变时，系统宏观性质不随时间改变的状态
D.
没有外界作用时的状态
【单选题】（3）下列描述属于热力学研究特点的是（ ）。
A.
研究对象是大数量分子的集合体的统计行为。
B.
既考虑变化前后的净结果，又考虑物质的微观结构和反应机理。
C.
不仅判断变化能否发生以及进行到什么程度，同时也考虑变化所需要的时间。
D.
不仅研究化学反应的可能性，也考虑其现实性。
【单选题】Many objects in daily use have clearly been influenced by science, but their form and function, their dimensions and appearance were determined by technologists, artisans, designers, inventors, and en...
A.
Mathematical thinking is essential to any design course.
B.
Nonverbal thinking has its advantage over other perceptive processes.
C.
Engineering design demands scientific thought.
D.
Artists play a primitive role in engineering design.
【单选题】PASSAGE TWO At the age of twelve years, the human body is at its most vigorous. It has yet to reach its full size and strength, and its owner his or her full intelce; but at this age the likeliho...
A.
Our first twelve years represent the peak of human development.
B.
People usually are unhappy when reminded of ageing.
C.
Normally only a few of us can live to the eighties and nineties.
D.
People are usually less likely to die at twelve years old.
相关题目：
【单选题】按照热力学上通常的规定，下列反应中ΔrHm和生成物的ΔfHm相等的是…( )
A.
(s)+CO2(g) →CaCO3
B.
6Li(s)+N2(g) →2Li3N(s)
C.
1/2H2(g)+1/2Br2(l) →HBr(g)
D.
2H2(g)+ O2(g)→2H2O(g)
【简答题】质量为M的快艇携带一颗质量为m的鱼雷，两者一起以速度v向前运动．快艇沿前进方向发射鱼雷后，速度减为原来的 1 3 ，不计水的阻力，则鱼雷的发射速度为（ ）
A.
2M+3m 3m v
B.
2M 3m v
C.
4M-m 3m v
D.
4M 3m v
【单选题】热力学中平衡态指______。
A.
系统宏观性质不随时间改变的状态
B.
没有外界作用时系统宏观性质不随时间改变的状态
C.
外界作用不变时，系统宏观性质不随时间改变的状态
D.
没有外界作用时的状态
【单选题】（3）下列描述属于热力学研究特点的是（ ）。
A.
研究对象是大数量分子的集合体的统计行为。
B.
既考虑变化前后的净结果，又考虑物质的微观结构和反应机理。
C.
不仅判断变化能否发生以及进行到什么程度，同时也考虑变化所需要的时间。
D.
不仅研究化学反应的可能性，也考虑其现实性。
【单选题】Many objects in daily use have clearly been influenced by science, but their form and function, their dimensions and appearance were determined by technologists, artisans, designers, inventors, and en...
A.
Mathematical thinking is essential to any design course.
B.
Nonverbal thinking has its advantage over other perceptive processes.
C.
Engineering design demands scientific thought.
D.
Artists play a primitive role in engineering design.
【单选题】PASSAGE TWO At the age of twelve years, the human body is at its most vigorous. It has yet to reach its full size and strength, and its owner his or her full intelce; but at this age the likeliho...
A.
Our first twelve years represent the peak of human development.
B.
People usually are unhappy when reminded of ageing.
C.
Normally only a few of us can live to the eighties and nineties.
D.
People are usually less likely to die at twelve years old.
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