Homework Help: Calculus

Posted by jimmy on Friday, May 4, 2007 at 4:30am.

1. Find the volume formed by rotating the region enclosed by x=5y and x=y^3 with y≥0 about the y-axis.

2. Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis y=18x-6x^2 , y=0 : about the y-axis.

PLease can anyone help me find the volume plz show ur works if u can so i can understand it better.

are you more comfortable finding volume by rotating about the x-axis.
Here is a good trick that works well in the first case.
Interchange the x and y variables in your equations and rotate about the x-axis, you get the same shape. (Basically I took the inverse)
BTW, I don't know what "..with y≥0.." means.

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