运动过程中求天车物体运动的最大速度度.为什么“沙箱向

来源：蜘蛛抓取(WebSpider) 时间：2018-01-26 03:52 标签： 物体运动的最大速度
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/etc/nginx/nginx.conf.试题试卷试题篮组卷网继续提供中小学组卷服务，数学组卷、物理组卷、语文组卷。海量试题任意组题组卷，关注公众号zujuancom 有惊喜 共计0题，平均难度：高考组卷自建题库选题题号：41049题型：计算题难度：一般引用次数：724更新时间： 11:46:47来源：如图所示质量为M的天车静止在光滑水平轨道上，下面用长为L的细线悬挂着质量为m的沙箱，一颗质量为m0的子弹以v0的水平速度射入沙箱，并留在其中，在以后运动过程中（1）沙箱上升的最大高度。（2）天车的最大速度。&【知识点】&&&&
提示: 下载试题将会占用您每日试题的下载次数,建议加入到试题篮统一下载(普通个人用户: 3次/天) 类题推荐高中物理综合库如图所示，光滑水平面上有一质量M ＝4．0 kg的平板车，车的左端紧靠地面上的固定挡板N，车的上表面右侧是一段长L＝1．0 m的水平轨道，水平轨道左侧连一半径R = 0．25 m的1/2光滑圆弧轨道，圆弧轨道与水平轨道在O′点相切．车右端固定一个尺寸可以忽略、处于锁定状态的压缩弹簧，一质量m＝1．0 kg的小物块紧靠弹簧，小物块与水平轨道间的动摩擦因数μ＝0．5．整个装置处于静止状态，现将弹簧解除锁定，小物块被弹出，恰能到达圆弧轨道的最高点A而抛出，g取10 m/s2．求：（1）小物块能否落在平板车上？若能，求小物块的落点距O′点的距离；（2）解除锁定前弹簧的弹性势能；（3）若撤去地面上的挡板N，解除弹簧的锁定，小物块被弹出，第一次经过O′点时的速度大小。如图回旋加速器的D形盒半径为R，用来加速质量为m，带电量为q的质子，使质子由静止加速到具有能量为E后，由A孔射出，求：（1）加速器中匀强磁场B的方向和大小．（2）设两D形盒间的距离为d，其间电压为U，则加速到上述能量所需回旋周数是多少？（3）加速到上述能量所需时间（不计通过缝隙的时间）．&如图所示，在倾角为的光滑斜面上，存在着两个磁感应强度相等的匀强磁场，方向一个垂直斜面向上，另一个垂直斜面向下，宽度均为L，一个质量为m，边长为L的正方形线框以速度v刚进入上边磁场时，即恰好做匀速直线运动，求：（1）当边刚越过时，线框的加速度多大？方向如何？（2）当到达与中间位置时，线框又恰好作匀速运动，求线框从开始进入到边到达与中间位置时，产生的热量是多少？ 试题点评
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