x = kt,dx = k dt
y = a cost,dy = - a sint dt
z = a sint,dz = a cost dt
t:0→π
∮Γ (x² + y² + z² - a²)dx + zdy - ydz
= ∫(0→π) [(k²t² + a² cos²t + a² sin²t - a²)(k) + (a sint)(- a sint) - (a cost)(a cost)] dt
= ∫(0→π) (k³t² - a²) dt
= (1/3 * k³t³ - a² t):(0→π)
= (1/3)k³π³ - a²π
求坐標的曲面積分:∫Γ(x²+y²+z²-a²)dx+zdy-ydz
求坐標的曲面積分:∫Γ(x²+y²+z²-a²)dx+zdy-ydz
其中Γ是空間曲線弧x=kt,y=acost,z=asint上對應t 從0到π的一段弧
拜托了~
其中Γ是空間曲線弧x=kt,y=acost,z=asint上對應t 從0到π的一段弧
拜托了~
數(shù)學人氣:867 ℃時間:2020-08-15 03:24:30
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