求擺線x=a(t-sint),y=a(1-cost),0≤t≤2π.與x軸所圍成圖形繞y軸旋轉(zhuǎn)所的旋轉(zhuǎn)體的體積.
求擺線x=a(t-sint),y=a(1-cost),0≤t≤2π.與x軸所圍成圖形繞y軸旋轉(zhuǎn)所的旋轉(zhuǎn)體的體積.
數(shù)學(xué)人氣:574 ℃時(shí)間:2020-02-04 05:11:50
優(yōu)質(zhì)解答
首先取體積微元,在x=a(t-sint)處,x變化量為dx,形成的圓環(huán)面積為:dS=2πxdx,圓環(huán)所在柱面體積:dV=ydS=2πxydx又dx=d[a(t-sint)]=a(1-cost)dt將x,y參數(shù)方程代入得:dV=2π[a(t-sint)][a(1-cost)][a(...
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