Solids of Revolution Exploration
This will allow you to explore solids of revolutions formed by revolving a function around the x-axis. You can control the angle through which you revolve the function with the slider for Alpha. The slider for X determines how far along the x-axis the function will be revolved, and the slider for n determines the number of iterations that will be executed on the interval [0,x].
Finally, you can animate the revolution by clicking the play button in the bottom left corner of the window.