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ID:39320658
大小:2.26 MB
页数:146页
时间:2019-06-30
《大学物理课后题解答》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、课后习题课件Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.第一章质点的运动规律1.一质点具有恒定加速度,在时,其初速度为零,初位置为。求(1)任意时刻的速度和位置矢量;(
2、2)质点的轨迹方程,并画出轨迹示意图。时解:(1)任意时刻比速度和位置矢量Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.(2)质点轨迹得xy10质点的轨迹图Evaluat
3、iononly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.2.一身高为的人,用绳子拉一雪橇奔跑,雪橇放在高出地面的光滑平台上,若人奔跑的速率,求雪橇的速度、加速度。解:方法1:建立Ox,如习题2图
4、(a)并没t=0时人在滑轮A的正下方,则雪橇的运动方程为:雪橇的速度为,运动方向与x方向相反雪橇的加速度Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.习题2图(a)ox习
5、题2图(b)oAADEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.方法二:建立坐标,如习题2图(b)并设t=0时人在滑轮A的正下方,有,l为t时刻绳AD长,是t时刻人的坐
6、标,均为变值。雪橇的速率人的速率对(1)式求导,雪橇运动方向与正方向相同Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.3.一球以的速率水平抛出,求后的切向加速度和法向加速
7、度。解:方法1:速率方法2:切向单位矢量切向加速度大小将Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.4.一质点由静止出发,它的加速度在轴的分量为,在轴的分量为,求5s时
8、质点的速度、位置。解:Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesf
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