如图,不计重力的杠杆OB可绕O点转动,重为6N的物体P悬挂在中点A处,拉力F1与 发布时间:2017-07-23 07:07 │ 来源:www.tikuol.com 题型:操作题 问题: 如图,不计重力的杠杆OB可绕O点转动,重为6N的物体P悬挂在中点A处,拉力F1与杠杆成30°角,杠杆在水平位置平衡,请在图中画出拉力F1 的力臂,并求出此状态下拉力F1=____N。
题型:操作题 “You ______ your teacher for help. He is kind-hearted.” “Yes. A whole day _______.”A.can ask, will wasteB.must have asked, had wastedC.could have asked, was wastedD.shouldn’t have asked, would be wasted 查看答案