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Answers for “为什么关于 y 轴的面积惯性矩在积分中使用 x^2?”

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To set up the integral for IyI_y using a vertical strip, first express the differential area dAdA in terms of xx. A vertical strip has an infinitesimal width dxdx and a height determined by the difference between the upper and lower boundary curves at position xx.

Conditions: The region is bounded by curves that can be expressed as functions of xx.; A vertical differential strip is chosen, meaning its width is dxdx.; The integration variable is xx.

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To use the curve equation y2=2xy^2 = 2x in an integral setup with vertical strips (where the height must be a function of xx), you must solve for yy. Taking the square root of both sides gives y=±2xy = \pm\sqrt{2x}.

Conditions: The boundary curve is given as y2=2xy^2 = 2x.; The region is in the first quadrant (x≥0,y≥0x \ge 0, y \ge 0).; Vertical strips are being used, requiring height as a function of xx.