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Volume of a rotating body, rotating y=(a*x)^(1/2) along y-axis

ÀÛ¼ºÀÚ Uploader : chocopi ÀÛ¼ºÀÏ Upload Date: 2019-08-12º¯°æÀÏ Update Date: 2019-08-13Á¶È¸¼ö View : 229

The volume of the rotating body obtained by rotating y=(a*x)^(1/2) along y-axis is calculated as follows.
(The radius of the rotating body is equal to x.)

Since x=y^2/a,

V = ¡ò¥ðx^2 dy = ¡ò¥ð(y^2/a)^2 dy = (¥ð/a^2)¡òy^4 dy = ¥ð/(5a^2)*y^5

If the integral range is from y1 to y2,

V = ¥ð/(5a^2)*(y2^5 - y1^5)

Expressing the integral range in terms of x,

y2 = (a*x2)^(1/2), y1 = (a*x1)^(1/2)

Thus,

V = ¥ð*a^(1/2)/5*(x2^(5/2) - x1^(5/2))

*** Âü°í¹®Çå[References] ***

V = ¥ð*a^(1/2)/5*(x2^(5/2) - x1^(5/2))
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