重为500N的物体在一个水平向右的拉力F的作用下,沿水平地面做匀速直线运动,已知 发布时间:2017-06-26 16:59 │ 来源:www.tikuol.com 题型:问答题 问题: 重为500N的物体在一个水平向右的拉力F的作用下,沿水平地面做匀速直线运动,已知地面对它的摩擦力是本身重力的0.3倍.(1)物体受到的摩擦力是多少?(2)水平拉力F的大小是多少?
题型:问答题 根据首字母及汉语提示,完成下列单词的拼写,使句意通顺。小题1:Do you think this kind of water is s_____(安全) for drinking?小题2:He is writing on the blackboard with a piece of c_____ (粉笔).小题3:Our teachers are all very s_____ (严格) with us students.小题4:Tom i_____ (邀请) all his best friends to his birthday party last Sunday.小题5:We have to d_____ (携带) a lot of books in our school bags every day. 查看答案