2021年全国历年高考物理超详细压轴题总结归纳,推荐文档.pdf

全国历年高考物理压轴题汇总理综25.(20 分)有个演示实验，在上下面都是金属板的玻璃盒内，放了许多锡箔纸揉成的小球，当上下板间加上电压后，小球就上下不停地跳动。现取以下简化模型进行定量研究。如图所示，电容量为C 的平行板电容器的极板A 和 B 水平放置，相距为d，与电动势为、内阻可不计的电源相连。设两板之间只有一个质量为m 的导电小球，小球可视为质点。已知：若小球与极板发生碰撞，则碰撞后小球的速度立即变为零，带电状态也立即改变，改变后，小球所带电荷符号与该极板相同，电量为极板电量的 倍（mgd其中q=Q又有 Q=C由以上三式有mgd C（2）当小球带正电时，小球所受电场力与重力方向相同，向下做加速运动。以a1表示其加速度，t1表示从 A 板到 B 板所用的时间，则有q+mg=ma1郝双制作dd=a1t1212当小球带负电时，小球所受电场力与重力方向相反，向上做加速运动，以a2 表示其加速度，t2表示从 B 板到 A 板所用的时间，则有ABdE名 师 归 纳 总 结|大 肚 有 容，容 学 习 困 难 之 事，学 业 有 成，更 上 一 层 楼 第 1 页，共 11 页qmg=ma2dd=a2t2212小球往返一次共用时间为（t1+t2），故小球在T 时间内往返的次数n=Tt1+t2由以上关系式得:n=T2md2C2+mgd+2md2C2mgd小球往返一次通过的电量为2q，在 T 时间内通过电源的总电量Q=2qn 11由以上两式可得:郝双制作Q=2CT2md2C2+mgd+2md2C2mgd2007 高考北京理综25（22 分）离子推进器是新一代航天动力装置，可用于卫星姿态控制和轨道修正。推进剂从图中P 处注入，在A 处电离出正离子，BC 之间加有恒定电压，正离子进入B 时的速度忽略不计，经加速后形成电流为I 的离子束后喷出。已知推进器获得的推力为F，单位时间内喷出的离子质量为J。为研究方便，假定离子推进器在太空飞行时不受其他阻力，忽略推进器运动的速度。求加在BC 间的电压 U；为使离子推进器正常运行，必须在出口 D 处向正离子束注入电子，试解释其原因。（动量定理：单位时间内F=Jv；单位时间内，消去 v 得 U。）推JIFU22221JvUI进器持续喷出正离子束，会使带有负电荷的电子留在其中，由于库仑力作用，将严重阻碍正离子的继续喷出。电子积累足够多时，甚至会将喷出的正离子再吸引回来，致使推进器无法正常工作。因此，必须在出口D 处发射电子注入到正离子束中，以中和正离子，使推进器持续推力。难三、磁场xyB2B1OvABCDP名 师 归 纳 总 结|大 肚 有 容，容 学 习 困 难 之 事，学 业 有 成，更 上 一 层 楼 第 2 页，共 11 页文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L7文档编码:CQ6A8A2X2D7 HR3P7X9O9L5 ZF5X9N6O5L72006年理综（黑龙江、吉林、广西、云南、贵州等省用）25（20 分）如图所示，在x0 与 x0 的区域中，存在磁感应强度大小分别为B1与 B2的匀强磁场，磁场方向垂直于纸面向里，且B1B2。一个 带负电 的粒子从坐 标原点 O 以速度 v 沿 x轴负 方向射出，要使 该粒子 经过 一段 时间 后又 经过 O 点，B1与 B2的比值应满足什么条件？解析：粒子在整个过程中的速度大小恒为v，交替地在xy 平面内 B1与 B2磁场区域中做匀速圆周运动，轨迹都是半个圆周。设粒子的质量和电荷量的大小分别为m 和 q，圆周运动的半径分别为和r2，有 r11mvqBr22mvqB现分析粒子运动的轨迹。如图所示，在xy 平面内，粒子先沿半径为r1的半圆 C1运动至 y 轴上离 O 点距离为2r1的 A 点，接着沿半径为2r2的半圆 D1运动至 y 轴的 O1点，O1O 距离d 2（r2r1）此后，粒子每经历一次“回旋”（即从 y 轴出发沿半径r1的半圆和半径为r2的半圆回到原点下方y 轴），粒子 y 坐标就减小d。设粒子经过n 次回旋后与y 轴交于 On点。若 OOn即nd满足nd2r1=则粒子再经过半圆Cn+1就能够经过原点，式中n1，2，3，为回旋次数。由式解得11nrnrn由式可得B1、B2应满足的条件 n1，2，3，211BnBn评分参考：、式各2 分，求得式12 分，式 4 分。解法不同，最后结果的表达式不同，只要正确，同样给分。名 师 归 纳 总 结|大 肚 有 容，容 学 习 困 难 之 事，学 业 有 成，更 上 一 层 楼 第 3 页，共 11 页文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P92007 高考全国理综25（22 分）两平面荧光屏互相垂直放置，在两屏内分别取垂直于两屏交线的直线为x 轴和 y 轴，交点O 为原点，如图所示。在y0，0 x0，xa 的区域由垂直于纸面向外的匀强磁场，两区域内的磁感应强度大小均为 B。在 O 点处有一小孔，一束质量为m、带电量为q（q0）的粒子沿x 轴经小孔射入磁场，最后打在竖直和水平荧光屏上，使荧光屏发亮。入射粒子的速度可取从零到某一最大值之间的各种数值。已知速度最大的粒子在0 xa 的区域中运动的时间之比为25，在磁场中运动的总时间为7T/12，其中T 为该粒子在磁感应强度为B 的匀强磁场中作圆周运动的周期。试求两个荧光屏上亮线的范围（不计重力的影响）。y 轴范围：0-2a；x 轴范围：2a-难a33122008 年（重庆卷）25.（20 分）题 25 题为一种质谱仪工作原理示意图.在以 O 为圆心，OH 为对称轴，夹角为 2 的扇形区域内分布着方向垂直于纸面的匀强磁场.对称于 OH 轴的 C 和 D 分别是离子发射点和收集点.CM 垂直磁场左边界于M，且 OM=d.现有一正离子束以小发散角（纸面内）从 C 射出，这些离子在CM 方向上的分速度均为v0.若该离子束中比荷为的离子qm都能汇聚到D，试求：（1）磁感应强度的大小和方向（提示：可考虑沿CM 方向运动的离子为研究对象）；（2）离子沿与CM 成角的直线CN 进入磁场，其轨道半径和在磁场中的运动时间；（3）线段 CM 的长度.25.解：（1）设沿 CM 方向运动的离子在磁场中做圆周运动的轨道半径为R由12R200mvqv BRR=d得 B0mvqdxyOa名 师 归 纳 总 结|大 肚 有 容，容 学 习 困 难 之 事，学 业 有 成，更 上 一 层 楼 第 4 页，共 11 页文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9Ev0B21磁场方向垂直纸面向外（2）设沿 CN 运动的离子速度大小为v，在磁场中的轨道半径为R，运动时间为t由 vcos=v0 得 v0cosvR=mvqB=cosd方法一：设弧长为st=svs=2(+)Rt=02vR）（方法二：离子在磁场中做匀速圆周运动的周期T2 mqBt=0)(2v(3)方法一：CM=MNcot=)sin(dMNsinR=cosd以上 3 式联立求解得CM=dcot方法二：设圆心为A，过 A 做 AB 垂直 NO，可以证明NMBONM=CMtan又 BO=ABcot=Rsincot=cotsincosdCM=dcot四、复合场名 师 归 纳 总 结|大 肚 有 容，容 学 习 困 难 之 事，学 业 有 成，更 上 一 层 楼 第 5 页，共 11 页文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P92006年全国理综(四川卷)25（20 分）如图所示，在足够大的空间范围内，同时存在着竖直向上的匀强电场和垂直纸面向里的水平匀强磁场，磁感应强度B1.57T。小球 1 带正电，其电量与质量之比=4C/kg，11qm所受重力与电场力的大小相等；小球2 不带电，静止放置于固定和水平悬空支架上。小球1 向右以 v023.59m/s 的水平速度与小球2 正碰，碰后经0.75s 再次相碰。设碰撞前后两小球带电情况不发生改变，且始终保持在同一竖直平面内。（取 g9.8 m/s2）问：（1）电场强度E 的大小是多少？（2）两小球的质量之比是多少？解析（1）小球 1 所受的重力与电场力始终平衡mg1=q1EE2.5N/C （2）相碰后小球1 做匀速圆周运动，由牛顿第二定律得：q1v1B111vmR半径为R11 11m vq B周期为T1s112mq B两球运动时间t0.75sT34小球 1 只能逆时针经周期时与小球2 再次相碰34第一次相碰后小球2 作平抛运动 h R1212gtL R1v2t两小球第一次碰撞前后动量守恒，以水平向右为正方向m1v0m1v1+m2v2由、式得v23.75m/s由式得v117.66m/s名 师 归 纳 总 结|大 肚 有 容，容 学 习 困 难 之 事，学 业 有 成，更 上 一 层 楼 第 6 页，共 11 页文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9两小球质量之比1122111mvvmv2006 年（广东卷）18（17 分）在光滑绝缘的水平桌面上，有两个质量均为，电量为的完全相同的带mq电粒子和，在小孔 A 处以初速度为零先后释放。在平行板间距为的匀强电场中1P2Pd加速后，从 C 处对着圆心进入半径为R 的固定圆筒中（筒壁上的小孔C 只能容一个1P粒子通过），圆筒内有垂直水平面向上的磁感应强度为B 的匀强磁场。每次与筒壁发1P生碰撞均无电荷迁移，进入磁场第一次与筒壁碰撞点为D，如图 121PCOD所示。延后释放的，将第一次欲逃逸出圆筒的正碰圆筒内，此次碰撞刚结束，立2P1P即改变平行板间的电压，并利用与之后的碰撞，将限制在圆筒内运动。碰撞过2P1P1P程均无机械能损失。设，求：在和相邻两次碰撞时间间隔内，粒子Rd852P1P与筒壁的可能碰撞次数。1P附：部分三角函数值52345678910tan08.373.100.173.058.00.4841.036.032.0解：P1从 C 运动到 D，周期，2 mTqB半径rRtan，2mvqB从 C 到 D 的时间2CDtT每次碰撞应当在C 点，设 P1的圆筒内转动了n 圈和筒壁碰撞了K 次后和 P2相碰于C 点，K1所以时间间隔，则2 n名 师 归 纳 总 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ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP9U7O8T7Z9 HW2P3Y2Z5H4 ZY6Z10P5E9P9文档编码:CP