




已阅读5页,还剩2页未读, 继续免费阅读
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
专业好文档常微分方程课程作业4解答1. 解答:证:首先,方程的任意两个线性无关解的郎斯基行列式在区间i上恒不为零。可表如下 ,为区间i上任一点。由于, 在区间i上连续、恒不为零。故在区间i上恒不为零,即同号。此即 (与同号)在区间i上不变号。亦即在区间i上严格单调。2. 解答:证:设二阶线性齐次方程的任意两个线性无关解组的郎斯基行列式分别为: a , b分别为这两个行列式在某一点的值。由于线性无关解组的行列式恒不为零。故a , b都不为零。两个行列式之比或为非零常数。3. 解答:方程可变为 通解为:以 代入得 = = = =4. 解答: 或 显然 当为常数时,(比如 =0就能如此)其基本解组的郎斯基行列式为常数。5. 解答: (1) 方程的特征方程为 特征根为 所以方程的通解为 ,其中为任意常数。(2) 方程的特征方程为 特征根为 所以方程的通解为 ,其中,为任意常数。(3) 方程的特征方程为 特征根为 所以方程的通解为 ,其中,为任意常数。6. 解答:(1) 方程的特征方程为 特征根为 所以方程的通解为 ,其中为任意常数。以代入下两式, 得 所以 方程满足初始条件的解为 (2) 方程的特征方程为 特征根为 所以方程的通解为 ,其中为任意常数。以代入下两式 得 所以 方程满足初始条件的解为 7. 解答:(1)齐次方程的特征方程为特征根为 通解为 ,其中为任意常数。令 代入比较同次项系数得 所以方程的通解为(2)齐次方程的特征方程为特征根为 通解为 ,其中为任意常数。令 代入比较同次项系数得 所以方程 的通解为(3)齐次方程的特征方程为特征根为 通解为 ,其中为任意常数。令 代入比较同次项系数得 所以方程的通解为8. 解答:由 f=k x 以 f=9.8 , x=1 得 k=9.8又 得 即特征方程为 特征根为 通解为 ,其中为任意常数。令 , 则有 所求周期为 9. 解答: 由 得 即 的特征方程为 特征根为 通解为 ,其中为任意常数。令 代入 得 故 的通解为以 t=0 , x=0 , x/=0 代入下两式 , 所以质点的运动规律为: if we dont do that it will go on and go on. we have to stop it; we need the courage to do it.his comments came hours after fifa vice-president jeffrey webb - also in london for the fas celebrations - said he wanted to meet ivory coast international toure to discuss his complaint.cska general director roman babaev says the matter has been exaggerated by the ivorian and the british media.blatter, 77, said: it has been decided by the fifa congress that it is a nonsense for racism to be dealt with with fines. you can always find money from somebody to pay them.it is a nonsense to have matches played without spectators because it is against the spirit of football and against the visiting team. it is all nonsense.we can do something better to fight racism and discrimination.this is one of the villains we have today in our game. but it is only with harsh sanctions that racism and discrimination can be washed out of football.the (lack of) air up there watch mcayman islands-based webb, the head of fifas anti-racism taskforce, is in london for the football associations 150th anniversary celebrations and will attend citys premier league match at chelsea on sunday.i am going to be at the match tomorrow and i have asked to meet yaya toure, he told bbc sport.for me its about how he felt and i would like to speak to him first to find out what his experience was.uefa hasopened disciplinary proceedings against cskafor the racist behaviour of their fans duringcitys 2-1 win.michel platini, president of european footballs governing body, has also ordered an immediate investigation into the referees actions.cska said they were surprised and disappointed by toures complaint. in a statement the russian side added: we found no racist insults from fans of cska.baumgartner the disappointing news: mission aborted.the supersonic descent could happen as early as sunda.the weather plays an important role in this mission. starting at the ground, conditions have to be very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. the balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. it will climb higher than the tip of mount everest (5.5 miles/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 kilometers) and into the stratosphere. as he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.the balloon will slowly drift to the edge of space at 120,000 feet ( then, i would assume, he will slowly step out onto something resembling an olympic diving platform.below, the earth becomes the concrete bottom of a swimming pool that he wants to land on, but not too hard. still, hell be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. it will be like he is diving into the shallow end.skydiver preps for the big jumpwhen he jumps, he is expected to reach the speed of sound - 690 mph (1,110 kph) - in less than 40 seconds. like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to earth. but this will not be enough to stop him completely.if he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. his team hopes its not needed. instead, he plans to deploy his 270-square-foot (25-square-meter) main chute at an altitude of around 5,000 feet (1,524 meters).in order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). he will have a reserve parachute that will open automatically if he loses consciou
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 插件机购销合同5篇
- 合水县2025甘肃庆阳市合水县事业单位引进高层次急需紧缺人才22人(第三批)笔试历年参考题库附带答案详解
- 丰都县2025二季度重庆丰都事业单位考核招聘12人笔试历年参考题库附带答案详解
- 2025陕西金融资产管理股份有限公司员工招聘(26人)笔试参考题库附带答案详解
- 2025辽宁省能源控股集团所属抚矿集团招聘76人笔试参考题库附带答案详解
- 2025江苏南京六合科技创业投资发展有限公司招聘10人笔试参考题库附带答案详解
- 2025广东湛江市麻章区城乡国有资产经营有限公司招聘5人笔试参考题库附带答案详解
- 2025年潍坊交通发展集团有限公司公开招聘(19人)笔试参考题库附带答案详解
- 2025年江西井冈山市市场监督管理局面向社会公开招聘4人笔试参考题库附带答案详解
- 2025年国网湖南省电力有限公司高校毕业生招聘(第二批)笔试参考题库附带答案详解
- 超早期脑梗死的CT影像表现及诊断课件
- 拉西地平原料制药课程设计说明书
- 小学体育-小学二年级《单双脚跳》教学设计学情分析教材分析课后反思
- 居室环境的清洁与消毒
- ××领导班子及成员分析研判报告
- GB/T 9124.1-2019钢制管法兰第1部分:PN系列
- GB/T 2518-2008连续热镀锌钢板及钢带
- Frenchay构音障碍评定
- 教育学原理课后答案主编项贤明
- 建筑装饰施工技术-轻质隔墙工程施工课件(-)
- 语言领域核心经验《学前儿童语言学习与发展核心经验》
评论
0/150
提交评论