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1、B
2、B
3、B
4、C
5、B
6、C
7、C
8、C
9、(1)重力势能转化为动能;
(2)不能,玻璃是绝缘体,掉入环形槽中也不能使电路形成通路;
(3)保护电路,调节电铃的响度;
(4)防止滑片接触不良形成开路;
(5)使圆台表面更光滑(放在较高的楼层)。
10、2倍、光屏到磁针(或光屏到平面镜)
11、(1)G物=mg=32kg×10N/kg=320N;
(2)W总=(G物+G篮+G轮)h=(320N+60N+20N)×3m×5=6000J
η=W有/W总=Gh/W总=320N×3m×5/6000J=80%
(3)减小篮框的或动滑轮的重力,减小绳重及摩擦,或一次吊运更多的物体。
12、24.2Ω,672s。