Solids of revolution are explained pretty well here: Pauls Online Notes : Calculus I - Volumes of Solids of Revolution / Method of Rings
There's even an example that is very close to your problem.
Solids of revolution are explained pretty well here: Pauls Online Notes : Calculus I - Volumes of Solids of Revolution / Method of Rings
There's even an example that is very close to your problem.