作者anne1008 (ane)
看板trans_math
标题[考古] 中山九十年理工
时间Tue Jul 6 14:26:26 2004
（４）
(b)a particle is moving along the parabola y=x^2+X-1 subject to the
vector field given as in(a). Find the work done in moving from the
point (-1,-1) to the point (3,11) if forces are mearsured in newtons
and distances are mearsured in meters?
(C) Evaluate the surface integral SSs(x-2x^3+3x^5)dA where s is the
part of the surface z=x^2 lying over ((x,y):-1<=x<=1,0<=y<=2)
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 218.162.148.74
1F：推 superkill:4 跟路径无关的线积分? 61.228.52.39 07/06
2F：推 superkill:(C) 这怪怪的 看不大懂题意 :Q 61.228.52.39 07/06
3F：→ superkill:唷知道了 就直接积分@@a 61.228.52.39 07/06
4F：推 superkill:那个dA是不是dσ 呀?????????? 61.228.52.39 07/06
5F：→ superkill:不然就不是面积分了呀?@@" 61.228.52.39 07/06
6F：推 inzaghi0221:应该用面积分吧~~~里面的再乘以面积好像 218.172.175.206 07/06
7F：推 inzaghi0221:我算出来零 .......应该错了吧.> < 218.172.175.206 07/06
8F：推 superkill:有没有原卷? 面积分也可以有被积分函数呀 61.228.52.39 07/06
9F：→ superkill:例如: SS面密度 dσ 这也算面积分呀 61.228.52.39 07/06
10F：→ superkill:但求出来的不是面积 而是质量 61.228.52.39 07/06
11F：推 inzaghi0221:嗯 应该是密度吧...才搭的上面积分 218.172.158.205 07/07
12F：推 inzaghi0221:应该说成微量面积吧~~ 218.172.158.205 07/07
13F：→ superkill:但他写的是dA 不是dσ 所以我才觉得怪怪? 61.228.63.178 07/07