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volume- integration (rotating a curve about y-axis)
發問:
given the curve y=x^2 when this curve rotates about the y-axis, a cone-like shpe is formed with volume V. express V in h, where h is the height of the "cone". (is there sufficient data? i hope so) 更新: standrad ans from雞尾包 good!!! this ans is good enough
最佳解答:
夠 data 啦, 不過我唔識打 integration 個符號, 我用下面方法代表 (integration 由 0 到 h) pi y dy = pi (integration 由 0 到 h) y dy = pi y^2 / 2 由 0 到 h = (pi h^2) / 2 pi 係 3.1416.... h^2 係 h 既平方 就係咁簡單,希望你明白我打既野
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