题型:问答题 简答题 用方框中所给词的适当形式完成句子。make he be much stay 1. Nancy doesn't go to the club any more, so he has ________ free time than before.2. Your bag is smaller than ________.3. Here ________ some photos of my family.4. We all enjoy ________ at home on weekends.5. The boss ________ his workers work 12 hours every day. 查看答案
题型:问答题 简答题 如图所示,细绳OA长30cm,O端与质量m=1kg的重物相连,A端与轻质圆环(重力不计)相连,圆环套在水平棒上可以滑动;定滑轮固定在距离圆环50cm的B处,跨过定滑轮的细绳,两端分别与重物m、重物G相连.若两条细绳间的夹角φ=90°,圆环恰好没有滑动,不计滑轮大小,整个系统处于静止状态,滑动摩擦力等于最大静摩擦力.求:(1)圆环与棒间的动摩擦因数μ;(2)重物G的质量M. 查看答案