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用打点计时器研究物体运动时，接通电源和让纸带随物体开始运动，这两个操作的时间关系应当是（ ）
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高一上学期物理《》真题及答案
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关于使用打点计时器的接通电源和释放纸带物体的次序下列说法正确的是
先接通电源，后释放纸带
先释放纸带，后接通电源
释放纸带同时接通电源
先接通电源或先释放纸带都可以
下列关于打点计时器的使用的说法中正确的是
电磁打点计时器使用的是4~6v的直流电源
在测量物体的速度时，先让物体运动，后接通打点计时器的电源
使用的电源频率越高，打点的时间间隔就越小
纸带上打的点越密集，说明物体运动得越快
在练习使用打点计时器的实验中用手拖动纸带打点.1本实验除打点计时器含纸带墨粉纸盘外还必须使用的主要仪
1在做用打点计时器测速度的实验时要用到打点计时器打点计时器是一种仪器其电源频率为50Hz常用的电磁打
接通打点计时器电源和让纸带开始运动这两个操作之间的时间顺序关系是A.先接通电源后让纸带运动B.先让纸
1在做用打点计时器测速度的实验时要用到打点计时器打点计时器是一种计时仪器其电源频率为50Hz常用的电
1电火花计时器是一种________仪器使用________电源工作电压________伏当电源频率
1电磁打点计时器是一种记录仪器使用电源工作电压伏当电源频率为50赫时它每隔打一次点.2使用打点计时器
8分1在做用打点计时器测速度的实验时要用到打点计时器打点计时器是一种计时仪器其电源频率为50Hz常用
1关于用打点计时器探究小车速度随时间变化规律的实验下列说法中错误的是A.开始实验时小车应靠近打点计时
用打点计时器研究物体运动时接通电源和让纸带随物体开始运动这两个操作的时间关系应当是
先接通电源，后释放纸带
先释放纸带，后接通电源
先释放纸带或先接通电源都可以
无法确定
关于打点计时器的使用说法正确的是A.电磁打点计时器使用的是10V以下的直流电源B.在测量物体速度时先
1在练习使用打点计时器的实验中打点计时器是一种计时仪器其电源频率为50HZ其中电磁打点计时器使用的电
关于打点计时器的使用说法正确的是
电磁打点计时器使用的是10V以下的直流电源
在测量物体速度时，先让物体运动，后接通打点计时器的电源
使用的电源频率越高，打点的时间间隔就越小
纸带上打的点越密，说明物体运动的越快
1根据打点计时器打出的纸带我们可以从纸带上直接得到的物理量是组选填字母选项①时间②位移③瞬时速度④平
1电磁打点计时器工作电源是选填直流或交流电源电压为V.电火花打点计时器是工作电压为V.频率为50Hz
1在做用打点计时器测速度的实验时要用到打点计时器打点计时器是一种仪器其电源频率为50Hz常用的电磁打
1当纸带与运动物体连接时在某一频率的低压交流电源下打点计时器在纸带上打出一序列点痕下列说法中正确的是
关于电磁打点计时器的使用下列说法正确的是________.
电磁打点计时器使用的是6V.左右的直流电源
在测量物体速度时，先让物体运动，后接通电源
使用的电源频率越高，打点的时间间隔就越小
在同一纸带上打的点越密，说明物体运动的速度越慢
1在做用打点计时器测速度的实验时要用到打点计时器打点计时器是一种计时仪器其电源频率为50Hz常用的电
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