11二体问题 两个具有球对称性的物体(视为质点)无外力作用, 在空间自由运动, 相互间有作用力(沿两者连线) 行星绕日, 或人造卫星绕地等, 都可以近似用该模型 该问题最终可以化成单个自由质在中心力作用下的运动问题2考虑二体问题(如图所示):由Newton定律:两式相加:3即质心做惯性(匀速直线)运动二体问题已被解决42n-体问题 n(n?2)个具有球对称性的物体(视为质点)无外力作用, 在空间自
12一、势力场及势能力 场:质点(系)所受力完全由其所在位置决定,这样的空间称为力场。势力场: 场力所做的功与质点经过的路径无关, 这样的力场称为势力场或保守力场。势能:质点从某一位置 A 到基准点 Ao ,有势力所 做的功,称为质点在该位置的势能。基准点 的势能为零。3二、势力场的特性三、质点系在势力场中的运动微分方程设质点系的势能函数为:质点系的运动方程:4质点系相对运动点的动量矩定理作用在第
UNIT 1 SECTION AUnit 1QICAIKETANGQICAIKETANGHOW CAN WE BE GOOD LEARNERS单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级??QICAIKETANGQICAIKETANGUNIT 6 SECTION AUNIT 6 SECTION AUnit 6Im watching TV.人教版七年级英
UNIT 11 SECTION AUNIT 1 SECTION AUnit 11How was your school trip人教版七年级英语下册Section A 2a-2d ObjectivesTo learn to listen for the details.To learn to talk about past events.talked on the phoneshopped
UNIT 5 SECTION AUnit 5Why do you like pandas人教版七年级英语下册Section A 2a-2dTo learn to describe animals.To learn to express preferences. ObjectivesIts a panda.Guess what animal it is. Its an elephant.Its a
UNIT 3 SECTION BUnit 3How do you get to school人教版七年级英语下册Section B 2a-2dTo learn the students crossing the river to school.To learn the new words and expressions: crossriver village bridge boat
UNIT 1 SECTION AUnit 1QICAIKETANGQICAIKETANGHOW CAN WE BE GOOD LEARNERS单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级??QICAIKETANGQICAIKETANGUNIT 1 SECTION AUNIT 1 SECTION AUnit 1Can you play the guitar人
UNIT 2 SECTION AUnit 2What time do you go to school人教版七年级英语下册Section A 2a-2d To learn to ask and answer What time questions. To learn to ask about and say times. To learn to use adverbs of freque
UNIT 1 SECTION AUnit 1QICAIKETANGQICAIKETANGHOW CAN WE BE GOOD LEARNERS单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级??QICAIKETANGQICAIKETANGUNIT 9 SECTION AUnit 9What does he look like人教版七年级英语下册Section
UNIT 12 SECTION AUNIT 12 SECTION AUNIT 1 SECTION AUnit 12What did you do last weekend人教版七年级英语下册Section A 2a-2dTo learn to talk about past events.To learn the phrases about activities at the weeke
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