拉力做功,There is a soft chain of mass M and length L,its 4/5 is set on the smooth table surface,and the remainder is free in air.Then the work done in order to draw the remainder up to table is__________at least.利用外力做功等于系统机
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/19 00:22:23
![拉力做功,There is a soft chain of mass M and length L,its 4/5 is set on the smooth table surface,and the remainder is free in air.Then the work done in order to draw the remainder up to table is__________at least.利用外力做功等于系统机](/uploads/image/z/13216316-68-6.jpg?t=%E6%8B%89%E5%8A%9B%E5%81%9A%E5%8A%9F%2CThere+is+a+soft+chain+of+mass+M+and+length+L%2Cits+4%2F5+is+set+on+the+smooth+table+surface%2Cand+the+remainder+is+free+in+air.Then+the+work+done+in+order+to+draw+the+remainder+up+to+table+is__________at+least.%E5%88%A9%E7%94%A8%E5%A4%96%E5%8A%9B%E5%81%9A%E5%8A%9F%E7%AD%89%E4%BA%8E%E7%B3%BB%E7%BB%9F%E6%9C%BA)
拉力做功,There is a soft chain of mass M and length L,its 4/5 is set on the smooth table surface,and the remainder is free in air.Then the work done in order to draw the remainder up to table is__________at least.利用外力做功等于系统机
拉力做功,
There is a soft chain of mass M and length L,its 4/5 is set on the smooth table surface,and the remainder is free in air.Then the work done in order to draw the remainder up to table is__________at least.
利用外力做功等于系统机械能的改变系统机械能的改变,我算的答案是1/5M*g*L,但感觉答案是不是太简单了点哦,不像大学物理啊.
是不是我想错了?给个简单的思路或者过程.
拉力做功,There is a soft chain of mass M and length L,its 4/5 is set on the smooth table surface,and the remainder is free in air.Then the work done in order to draw the remainder up to table is__________at least.利用外力做功等于系统机
不在桌上的长度是L/5,质量为M/5,要把它提到桌面上,其重心升高L/10,W=mgh=M/5*g*L/10=MgL/50
至少1/5M*g*L