So, the line integral for work Mdx+Ndy becomes in coordinates integral of Mdx plus Ndy while we've also seen line integral for flux.
那么对做功求线积分,就变成坐标积分,同时也有对通量求线积分的。
On the math it is a line integral of something dx plus something dy.
从数学意义上来说，这是dx部分加上dy部分的线积分。
We have the integral from minus infinity to plus infinity of F(x)*x*dx, and that's really--you see it's the same thing because an integral is analogous to a summation.
我们用从负无穷到正无穷的积分公式F(x)*x*dx,你看到的，这是相同的事，因为积分是类似的求和过程。
So that will be the line integral of Pdx plus Qdy.
这就变成了Pd x +Qdy的线积分。
For example, the moment of inertia about the z-axis is dV the triple integral of x squared plus y squared density dV.
例如，关于z轴的转动惯量,是∫∫∫δ
For example, the moment of inertia about the z-axis is dV the triple integral of x squared plus y squared density dV.
例如，关于z轴的转动惯量,是∫∫∫δ
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