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安徽省2023-2024期末八年级质量检测卷（2024.6）物理试卷答案试卷答案

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安徽省2023-2024期末八年级质量检测卷（2024.6）物理试卷答案第一部分

8.如图为某趣小蛋究简请运动的装置,轻质弹管上定在天花板上,下端个质让相等的小球。小球的后量为m,弹簧的劲度系数为k,观将小球的细线剪断,与簧相连的小球在竖直平面内做简请运动,以小球开胎运记为时间的起点,不计空气阻力,取向下为正方向,重力速度为T=2k,下列说法正确的是()A.弹簧振子的振A=mgkB.黄断统的闻,与弹簧相连的小球的加速度为C.在任意4时间内,小火的路程为D.弹簧子的握方程为xx=mk(km.)

安徽省2023-2024期末八年级质量检测卷（2024.6）物理试卷答案第二部分（待更新）

14.(14分)某种质谱仪可简化为如图所示的装置,粒子源释放出电荷量均为十q、质量不同的粒子,粒子的初速度可忽略,经电压为U0的直线加速器加速后,由D型通道的中缝MN进入磁场区,该通道的上下表面为内半径为2R、外半径为4R的半圆环。整个D型通道置于竖直向上的匀强磁场中,磁感应强度大小为B,正对着通道出口处放置一块照相底片,它能记录粒子从通道射出时的位置。不计粒子重力及粒子间的相互作用。(1)求所有粒子经过加速电场后到达MN时的动能Ek和打在照相底片中央的粒子质量(2)若a、b两粒子分别打在照相底片的左右两端,求a、b两粒子的质量之比