Question

Find the volume of the solid of revolution generated by revolving about the x-axis the region under the following curve.

y = √x from x=0 to x=20. The solid generated is called a paraboloid.

Answer 1

have you graphed it?

Answer 2

no i was trying to work it out

I got to this point and don't know what else to do\[\int\limits_{0}^{20} \Pi xdx = \Pi x ^{2}\div2 \int\limits_{0}^{20}\]