【简答题】为了探究“弹性势能的大小跟哪些因素有关”,小明同学有如下猜想: 猜想一:弹性势能的大小与弹簧的材料有关; 猜想二:弹性势能的大小与弹簧被压缩的程度有关。 为探究猜想一是否正确,小明同学设计了如图甲所示的实验装置,探究方案如下(以下所有弹簧被压缩后都未超过其弹性限度): ① 将A、B两根外形完全相同,材料不同的弹簧分别按图甲安装好; ② 将小球置于弹簧A的右端,使弹簧被压缩的长度为3cm(见图乙),...
【简答题】No more, please!! I work in an area full of cubicles ( 隔间 ). Of course, you hear everything going on with your co-workers, who they call, what they say, and their thoughts when they somehow believe th...
【简答题】Some children wish to be writers some day. They want to write stories or books for people to read. That' s good! It' s good to write something for people to read! But they should know that they need t...