[今日更新]2024年高考真题(新课标Ⅰ卷).物理试卷答案

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[今日更新]2024年高考真题(新课标Ⅰ卷).物理试卷答案试卷答案

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14.(13分)某同学设计了如图所示的弹射装置.四分之三光滑圆弧轨道BCD的半径为R,B点的正下方有一质量为m、电荷量为+q的小球压缩弹簧后被锁扣K锁在A点处,此时弹簧长度也为R.打开锁扣K,,小球被弹射出去并从B点沿切线方向进人圆弧轨道,恰好能过最高点C,在C点触发感应开关,瞬间在整个空间产生竖直向上的匀强电场并保持不变(题中未画出),电场强度大小E=mg2g.小球继续沿轨道运动到最低点D后抛出,最终落到地面上不反弹.已知D点离地面高度为3R,重力加速度为g,小球运动过程中不会与弹簧再次相碰,忽略小球进出轨道时的能量变化和空气阻力的影响,求:感应开关(1)打开锁扣K前,弹簧的弹性势能;(2)小球到达D点时的速度大小;(3)小球落地点与弹簧的水平距离.

5.指纹识别传感器在手机上应用十分广泛,如图所示是电容式传感器。指纹的凸起部分叫“嵴”,凹下部分叫“峪”。传感器上有大量面积相同的小极板,当手指贴在传感器上时,这些小极板和正对的皮肤表面形成大量的小电容器,这样在嵴处和峪处形成的电容器的电容大小不同,此时传感器给所有的电容器充电后达到同一电压值,然后,电容器放电,电容小的电容器放电较快,根据放电快慢的不同,就可以探测到嵴和峪的位置,从而形成指纹图像数据,根据文中信息,下列说法正确的是()A.充电后在处形成的电容器所带的电荷量小C.在峪处形成的电容器电容较小B.若在手机屏上增贴了一层厚度均匀的玻璃膜,则指纹识别解锁功能无法使用D.沾水潮湿的手指头对指纹识别绝对没有影响

17.在“探究光反射时的规律”实验中,老师在玻璃缸底部放一块平面镜,用加湿器使缸内充满水雾,如图所示,激光笔发出光束1射向平面镜,用另一支激光笔发出光束2当作法线。使缸内充满水雾的目的是为了,小明围绕玻璃缸缓慢转动,从某一角度观察到三束光线刚好重合,说明反射光线、入射光线和法线在。