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大学物理第二版习题答案罗益民北邮出版社第二章答案.pdf

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1、优秀学习资料欢迎下载第二章质点动力学2-1（1）对木箱，由牛顿第二定律，在木箱将要被推动的情况下如图所示，x 向：0cosmaxminfFy 向：0sinminMgFN还有Nfsmax解以上三式可得要推动木箱所需力F 的最小值为sincosssminMgF在木箱做匀速运动情况下，如上类似分析可得所需力F 的大小为sincoskkminMgF（2）在上面minF的表示式中，如果0sincoss，则minF，这意味着用任何有限大小的力都不可能推动木箱，不能推动木箱的条件是0sincoss由此得的最小值为s1arctan2-2（1）对小球，由牛顿第二定律x 向：maNTsincosy 向：0coss

2、inmgNT联立解此二式，可得N)(32.3)30sin8.930cos2(5.0)sincos(gamTN)(74.3)30sin230cos8.9(5.0)sincos(agmN由牛顿第三定律，小球对斜面的压力N)(74.3NN（2）小球刚要脱离斜面时N=0，则上面牛顿第二定律方程为mgTmaTsin,cos习题 2-1 图习题 2-2 图-第 1 页，共 16 页精品p d f 资料可编辑资料-优秀学习资料欢迎下载由此二式可解得2m/s0.1730tan/8.9tan/ga2-3 要使物体A 与小车间无相对滑动，三物体必有同一加速度a,且挂吊 B 的绳应向后倾斜。作此时的隔离体受力图如

3、图所示三物体只有水平方向的运动，只须列出水平方向的牛顿方程及相关方程：)4(:)3(0cos)2(sin:)1(:322211MaNFMgmTamTmamTm水平水平3N为绳中的雨拉力在水平向的合力)5(sin3TTN水平联立（1），（2），（3），（4），（5）解得)N(78480)(2221212gmmgmmmmF（因为三个物体有同一加速度a，且在水平方向只受外力F 的作同，所以，可将三个物体看作一个物体：aMmmF)(21再与（1），（2），（3）式联立求解即可。）2-4 由图写出力函数用积分法求解。)75(355)50(2ttttF(1)由tvmFdd得tFmvd1d(2)在s50内2

4、001d21tmttmvvtt(3)当 t=5 时：)sm(3025105mvv习题 2-3 图-第 2 页，共 16 页精品p d f 资料可编辑资料-文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1

5、C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档

6、编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1

7、C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档

8、编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1

9、C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档

10、编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8优秀学习资料欢迎下载在 5-7s 内再用（2）式5.1123525d)355(1255ttttmvvtt(4)当 t=7 时：)sm(4010157vv再用积分法：tvxtxvdd,dd(5)在 0-5s

11、内，由（3）式积分ttmvxxd)1(502005即)m(326831252505xx再由（4）式5.112352525tttvv求 5 得752557d)5.1123525(tttvxx得)m(142317357xx2-5 设两物体未用绳连接则由牛顿第二定律，沿x 方向，对A，有AAAAammggmcossink对于 B，有BBBBammggmcossink由此得2kAm/s63.3)30cos15.030(sin8.9)cos(singaA2kBm/s12.3)30cos21.030(sin8.9)cos(singaB（1）如图所示，A 在下，B在上。由于BAaa。所以绳被拉紧，二者一起

12、下滑，而aaaBA。以TT和分别表示绳对A 和 B的拉力)(TT，则由牛顿第二定律，沿 x 方向对 A：amTmggmAAAcossink对 B：amTmggmBBBcossink习题 2-5 图-第 3 页，共 16 页精品p d f 资料可编辑资料-文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9

13、I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2

14、K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9

15、I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2

16、K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9

17、I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2

18、K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8优秀学习资料欢迎下载由此得)m/s(29.330cos8.985.25.185.221.05.115.0

19、30sin8.9cossin2kkgmmmmagaBABBAA（2）图中绳中张力为N)(51.029.35.130cos8.95.115.030sin8.95.1cossinkamgmgmTAAAA（3）如果互换位置，A 在上，B 在下，则由于BAaa，连接绳子将松弛，因而T=0，此时 AB 的加速度即)m/s(12.3),m/s(63.322BBAAaaaa2-6 当漏斗转速较小时，m 有下滑趋势，小物体受最大静摩擦力mf方向向上，如图所示。对小物体，由牛顿第二定律x 向：rmfNmmin2cossiny 向：0sincosmgfNm还有Nfms联立解以上各式，可得rg)sin(cos)co

20、s(sinssmin或rg)sin(cos)cos(sin21ssmin当 n 足够大时，小物体将有上滑趋势，它将受到向下的静摩擦力，即mf的方向与图2.6 中所示的方向相反。与上类似分析可得最大转速为rgn)sin(cos)cos(sin21ssmax总起来讲，小物体在漏斗壁上不动，转速n 应满足的条件是minmaxnnn2-7 设圆柱与绳索间的摩擦力为f，绳对重物m1的拉力 T1，m1和 m2对地加速度分别为a1、a2，对 m1、m2列出方程习题 2-6 图-第 4 页，共 16 页精品p d f 资料可编辑资料-文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H

21、7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3

22、HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H

23、7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3

24、HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H

25、7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3

26、HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H

27、7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8优秀学习资料欢迎下载fTaamamgmfamTgm)(12222111联立解出：)2()()(2121211212212211agmmmmTfmmamgmmammamgmma2-8 质点在 x、y 两个方向都是匀加速直线运动。)m(874132167212166212)2(21)21()sm(8745)7()62()()(7622221-000jijijtaitatvrjijtmitmjtavitavvjmaimajiFyxxyy

28、xxyx2-9 tvmkvfddvvttmkvvtmkvv00dddd（1）积分得tmkvve0（2）tmkvtxvedd0积分得)e1(00tmk-kmvxxx（3）利用（1）的结果，令v=0 得t习题 2-7 图-第 5 页，共 16 页精品p d f 资料可编辑资料-文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档

29、编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1

30、C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档

31、编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1

32、C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档

33、编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1

34、C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8优秀学习资料欢迎下载代入（2）的结果中得00)01(vkmvkmx（4）将kmt代入

35、（1）的结果中得010e1evvv2-10 初始时刻0,0,000vxt，t 时刻受力如图所示，设x 为该时刻入水长度，棒的横截面积为s，有gsxfslm12浮当lx时有tvmfmgFdd浮即vxvslgsxgsldd212xlgxglvvxvdd021202/12122)2(2xxllgv（1）（1）当lx时2/1122)2(2glv（2）（2）当212时，（2）式无意义，即此条件将使棒不可能全部没入液体中，但（1）式仍然成立，当棒到达最大深度xm时 v=0，由（1）式得：)(01舍去mxlxm1222即为所求（3）由（1）式求极值得：当lx12时有glv12max2-11 以 M 和 m

36、分别表示木星和木卫三的质量，则由万有引力定律和牛顿第二定律，可得习题 2-10 图-第 6 页，共 16 页精品p d f 资料可编辑资料-文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6

37、ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X

38、4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6

39、ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X

40、4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6

41、ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X

42、4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8优秀学习资料欢迎下载(kg)1089.1)8640016.7(1067.6)1007.1(444272113922322222GTRMRmRTmRMmG2-12（1）设链条的质量线密度为，链条开始下滑时，其下垂直度为0

43、 x，应满足的条件是其下垂部分的重力等于或大于其在桌面部分的摩擦力，即：lxgxlgx1)(000（2）据功能原理12EEWr开始下滑时在桌面部分的长度为100lxly当链条的A 端从 O 点沿 y 轴运动到y0点过程中，摩擦力作功为22000122d)(d0lgygygyyyfWyrr设桌面为势能零点，则链开始下滑到A 端离桌面时的机机械能分别为2222201212112121gllvElggxE于是有22221212121112lggllvg化简可得1,12glvglv2-13 由于0vmvmI，故冲量I的大小由图所示可得sN3.720108.923.02)()(220202vghmmvm

44、vII 与水平方向的夹角为习题 2-12 图习题 2-13 图-第 7 页，共 16 页精品p d f 资料可编辑资料-文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E

45、8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF

46、4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E

47、8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF

48、4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E

49、8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF

50、4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8文档编码:CT4X4W9I9L3 HF4M1C8M1X6 ZX2K9P8H7E8优秀学习资料欢迎下载357.0201098.22200Vghvvtg球受到的平均冲力N)(36502.03.71tF2-14（1）4 秒内力的冲量s)(N56d)210(d40itittFI（2）由动量定量,0vmvmI可得)sm(4.0

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