英文的理论力学题!the triangular plate ABC is supported by ball-and-s
来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/08/18 21:14:43
英文的理论力学题!
the triangular plate ABC is supported by ball-and-socket joints at B and D and is held in the position shown by cables AE and CF.If the force exerted by cable AE at A is 220 lb,determine the moment of that force about the line joining points D and B
图有点不太清楚,原点到C点是36,原点到B点的距离36+12,B离“地面”的高度是14,D与A,C的水平距离均为16,(可能描述有错)请各位高手帮忙啊!我只有9分啊!只能给5分了!谢谢!
the triangular plate ABC is supported by ball-and-socket joints at B and D and is held in the position shown by cables AE and CF.If the force exerted by cable AE at A is 220 lb,determine the moment of that force about the line joining points D and B
图有点不太清楚,原点到C点是36,原点到B点的距离36+12,B离“地面”的高度是14,D与A,C的水平距离均为16,(可能描述有错)请各位高手帮忙啊!我只有9分啊!只能给5分了!谢谢!
我大概懂了,是求DB上的力对应的力矩。那DB上力的矢量怎么求呢?DB上的力就是沿着DB(即作用于DB的力矢量与DB这条线重合)的吗?
![英文的理论力学题!the triangular plate ABC is supported by ball-and-s](/uploads/image/z/18459026-26-6.jpg?t=%E8%8B%B1%E6%96%87%E7%9A%84%E7%90%86%E8%AE%BA%E5%8A%9B%E5%AD%A6%E9%A2%98%21the+triangular+plate+ABC+is+supported+by+ball-and-s)
determine the moment of that force about the line joining points D and B..中的that force 应该是the force exerted by cable AE at A.所以啊.求的是AE这个力对DB连线的力矩..DB连线就是一根轴.
那么就是AE对DB轴的力矩.用矢量做.力矩就是M=r×F,然后将M分解为DB向和垂直与DB.M在DB向的分量就是要求的M(DB).
还有一种就是 AE与DB是异面直线,做一辅助平面P,n为AE×DB,是平面的法线方向,DB在平面P内.将AE分解为平行P和垂直于P,那么AE(平行)×距离(P与AE的)就是要求的力矩.
总的说来第一种简单些.即M= DB .(r×F),DB的方向向量点乘(r叉乘AE力),r是DB上任意一点到A点的方向向量,比如DA,或者BA.
那么就是AE对DB轴的力矩.用矢量做.力矩就是M=r×F,然后将M分解为DB向和垂直与DB.M在DB向的分量就是要求的M(DB).
还有一种就是 AE与DB是异面直线,做一辅助平面P,n为AE×DB,是平面的法线方向,DB在平面P内.将AE分解为平行P和垂直于P,那么AE(平行)×距离(P与AE的)就是要求的力矩.
总的说来第一种简单些.即M= DB .(r×F),DB的方向向量点乘(r叉乘AE力),r是DB上任意一点到A点的方向向量,比如DA,或者BA.
The reform and opening policy is supported by the whole Chin
And the ball is round.的意思
一道英语单词填空题This is a special p____ supported and organized by
The installed version of Directx is not supported by
一道英文改错题原句是:There is a knife and a fork on the plate.怎么改?
英语首字母Mr.Ball is the head of the office.He’s able (能干的) and e
the red ball is not Kitty and Alice's.________ is blue
This is a of my bedroom.It's a nice .The door is .And a ball
英语翻译List the programs and tests to be supported by the I&M p
新高一英语改错题目the idea are highly praised and supported by the te
What is the different between “tray” and “plate”?
There is a knife and a fork on the plate.