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1、题型专练1(力学综合型)(2012 湖南模拟)如图 5 所示，AB 为倾角 37 的斜面轨道，轨道的 AC 部分光滑，CB 部分粗糙 BP 为圆心角等于143 半径 R1 m 的竖直光滑圆弧形轨道，两轨道相切于B 点，P、O 两点在同一竖直线上，轻弹簧一端固定在A 点，另一自由端在斜面上C 点处，现有一质量 m2 kg 的物块在外力作用下将弹簧缓慢压缩到D 点后(不栓接)释放，物块经过 C 点后，从 C 点运动到 B 点过程中的位移与时间的关系为 x12t4t2(式中 x 单位是 m，t 单位是 s)，假设物块笫一次经过 B点后恰能到达 P点，sin 37 0.6，cos 37 0.8，g 取
2、 10 m/s2.试求：图 5(1)若 CD1 m，试求物块从 D 点运动到 C 点的过程中，弹簧对物块所做的功；(2)B、C 两点间的距离 x；(3)若在 P 处安装一个竖直弹性挡板，小物块与挡板碰撞时间极短且无机械能损失，小物块与弹簧相互作用不损失机械能，试通过计算判断物块在第一次与挡板碰撞后的运动过程中是否会脱离轨道？2(粒子运动型)(2012 豫北六校联考)如图 6 所示，在平面坐标系 xOy的第象限内有沿 x 轴负方向的匀强电场，第、象限分别有垂直坐标系平面的匀强磁场 一质量为 m、电荷量为 q 的带正电粒子以速度v0 从 x轴上的 A(L,0)点沿 y 轴正方向进入匀强电场，经y
3、轴上的 B(0,2L)点进入第象限，再经x 轴上的 C(2L,0)点进入第象限，最后经第象限回到出发点A.不计粒子的重力求图 6(1)匀强电场的电场强度；(2)第、象限中磁场的磁感应强度大小各是多少？3(粒子运动型)如图 7 所示，两平行金属板A、B 长 l8 cm，两板间距离 d 8 cm，A 板比 B 板电势高 300 V，即 UAB 300 V一带正电的粒子电量 q1010C，质量 m1020kg，从 R点沿电场中心线垂直电场线飞入电场，初速度v02 106 m/s，粒子飞出平行板电场后经过界面 MN、PS间的无电场区域后，进入固定在中心线上的O 点的点电荷 Q形成的电场区域(设界面 P
4、S右边点电荷的电场分布不受界面的影响)已知两界面 MN、PS相距为 L12 cm，粒子穿过界面PS文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S
5、5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL
6、9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S
7、5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL
8、9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S
9、5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL
10、9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2最后垂直打在放置于中心线上的荧光屏EF上不计粒子重力求(静电力常数 k9 109 N m2/C2)图 7(1)粒子穿过界面 PS时偏离中心线 RO 的距离多远？(2)点电荷的电量4(力学综合型)如图 8 所示是为了检验某种防护罩承受冲击能力的装置，M 为半径为
11、R1.0 m、固定于竖直平面内的14光滑圆弧轨道，轨道上端切线水平，N 为待检验的固定曲面，该曲面在竖直面内的截面为半径r0.69 m 的14圆弧，圆弧下端切线水平且圆心恰好位于M 轨道的上端点，M 的下端相切处放置竖直向上的弹簧枪，可发射速度不同的质量 m0.01 kg 的小钢珠，假设某次发射的钢珠沿轨道恰好能经过M 的上端点，水平飞出后落到N 的某一点上，取 g10 m/s2，求：文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5
12、U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:C
13、Z8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5
14、U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:C
15、Z8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5
16、U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:C
17、Z8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5
18、U7 ZL9U1O3R3I2图 8(1)发射该钢珠前，弹簧的弹性势能Ep 多大？(2)钢珠落到圆弧N 上时的速度大小vN 是多少？(结果保留两位有效数字)5(电磁感应型)如图 9 所示，间距为 l、电阻不计的光滑导轨固定在倾角为 的斜面上 在区域内有方向垂直于斜面的匀强磁场，磁感应强度为B；在区域内有垂直于斜面向下的匀强磁场，其磁感应强度 Bt 的大小随时间 t 变化的规律如图 b 所示t0 时刻在轨道上端的金属细棒ab 从如图位置由静止开始沿导轨下滑，同时下端的另一金属细棒cd在位于区域内的导轨上由静止释放在ab 棒运动到区域的下边界 EF处之前，cd 棒始终静止不动，两棒均与导轨接触良好已
19、知cd棒的质量为 m、电阻为 R，ab棒的质量、阻值均未知，区域沿斜面的长度为 2l，在 ttx 时刻(tx 未知)ab 棒恰进入区域，重力加速度为 g.求：文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S
20、6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文
21、档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S
22、6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文
23、档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S
24、6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文
25、档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2图 9(1)通过 cd 棒电流的方向和区域内磁场的方向；(2)当 ab棒在区域内运动时cd 棒消耗的电功率；(3)ab 棒开始下滑的位置离EF 的距离；(4)ab 棒从开始下滑至 EF 的过程中回路中产
26、生的热量6(力电综合型)(2012 上海闵行二模)如图 10 甲所示，A、B、C、D为固定于竖直平面内的闭合绝缘轨道，AB 段、CD 段均为半径 R1.6 m 的半圆，BC、AD 段水平，AD BC8 mB、C 之间的区域存在水平向右的有界匀强电场，场强E5 105 V/m.质量为 m4 103kg、带电量 q1 108C的小环套在轨道上小环与轨道 AD 段的动摩擦因数为 18，与轨道其余部分的摩擦忽略不计现使小环在D 点获得沿轨道向左的初速度v04 m/s，且在沿轨道 AD 段运动过程中始终受到方向竖直向上、大小随速度变化的力F(变化关系如图10 乙)作用，小环第一次到A 点时对半圆轨道刚好
27、无压力不计小环大小，g 取 10 m/s2.求：(1)小环运动第一次到A 时的速度多大？文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1
28、 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3
29、R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1
30、 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3
31、R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1
32、 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3
33、R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2(2)小环第一次回到 D 点时速度多大？(3)小环经过若干次循环运动达到稳定运动状态，此时到达D 点时速度应不小于多少？图 10 参考答案1解析(1)由 x12t4t2 知，物块在 C 点速度为 v012 m/s 设物块从 D 点运动到 C 点的过程中，弹簧对物块所做的功
34、为W，由动能定理得：Wmgsin 37 CD12mv2 0代入数据得：W12mv2 0mgsin 37 CD156 J(2)由 x12t4t2 知，物块从 C 运动到 B 过程中的加速度大小为a8 m/s2 设物块与斜面间的动摩擦因数为，由牛顿第二定律得mgsin mgcos ma 代入数据解得 0.25 物块在 P 点的速度满足 mgmv2 PR物块从 B 运动到 P的过程中机械能守恒，文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8
35、C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码
36、:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8
37、C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码
38、:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8
39、C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码
40、:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8
41、C5U7 ZL9U1O3R3I2则有12mv2 B12mv2 PmghPB 物块从 C 运动到 B 的过程中有 v2 Bv2 02ax 由以上各式解得x498m(3)假设物块第一次从圆弧轨道返回并与弹簧相互作用后，能够回到与O 点等高的位置 Q 点，且设其速度为 vQ，由动能定理得12mv2 Q12mv2 PmgR2mgxcos 37解得 v2 Q190 可见物块返回后不能到达Q 点，故物块在以后的运动过程中不会脱离轨道答案(1)156 J(2)6.125 m(3)物块在以后的运动过程中不会脱离轨道2解析(1)粒子在第象限中做类平抛运动，由运动学公式和牛顿第二定律得：2Lv0tL12at2qE
42、ma联立解得：Emv2 02qL文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码
43、:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8
44、C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码
45、:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8
46、C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码
47、:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8
48、C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2(2)设粒子进入第象限时的速度v 与 y 轴夹角为 ，则根据粒子在第象限的运动得v0t2Lvxt2Lvv2 0v2 x偏转角 tan vxv0整理得：v2v0 45 即 v 与 BC 的连线垂直，所以BC 间的距离为粒子在第象限的磁场中运动的直径 BC2 2L?所以 r12L?根据 qvB1mv2r2?文档编码:CZ8F7S5
49、S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9
50、U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5S8L1 HJ6S6S8C5U7 ZL9U1O3R3I2文档编码:CZ8F7S5