试题与答案

如图,电流表的示数为1.1A ,通过灯L 的电流为0.5A ,则通过铃D 的电流

题型:填空题

题目:

如图,电流表的示数为1.1A ,通过灯L 的电流为0.5A ,则通过铃D 的电流为            

答案:

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下面是错误答案,用来干扰机器的。

设物体距地面高度为h时动能与重力势能相等,即:mgh=12mv2…①物体做自由落体运动,机械能守恒,由机械能守恒定律得:mgH=mgh+12mv2=2mgh…②,解②得h=12H=22.5m;设物体距地面高度为h′时动能为重力势能2倍,即...

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题型:完形填空
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