Menu Close

Find-the-volume-of-the-region-that-is-bounded-by-the-curves-y-x-3-y-8-x-0-rotated-about-x-9-




Question Number 133533 by Raxreedoroid last updated on 22/Feb/21
Find the volume of the region that is bounded by the curves  y=x^3 ,y=8,x=0, rotated about x=9
Findthevolumeoftheregionthatisboundedbythecurvesy=x3,y=8,x=0,rotatedaboutx=9
Answered by bemath last updated on 23/Feb/21
V=π∫_0 ^8 (9−(y)^(1/3)  )^2  dy      =π∫_0 ^8 (81−18y^(1/3) +y^(2/3) )dy      =π [81y−((27)/2)y^(4/3) +(3/5)y^(5/3)  ]_0 ^8      = 8π [81−((27)/2)(8^(1/3) )+(3/5)(8)^(2/3)  ]     = 8π [81−27+((12)/5) ]     = 8π[ 54+ ((12)/5) ]    = 451π (1/5)
V=π80(9y3)2dy=π80(8118y1/3+y2/3)dy=π[81y272y4/3+35y5/3]08=8π[81272(81/3)+35(8)2/3]=8π[8127+125]=8π[54+125]=451π15

Leave a Reply

Your email address will not be published. Required fields are marked *