[Gary Dillard]

I'm a Mechanical Engineer I use Calculus regularly in my work. Frequently I have to derive my own beam equations for unique situations that aren't available in Roark and that requires differential and integral Calculus. Also impact loads require performing an energy balance which is generally done with Calculus. If I want the moments of inertia of a section I usually just pull it out the CAD model, but if I want it parametric then I need to derive it with Calculus. Sometimes there are easier ways to get the answer but if you want to understand the sensitivity of the answer to variable parameters you really need to derive the equations yourself.