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## Homework Statement

For my High School AP Physics class, we need to build an engine to convert heat to mechanical energy. As such, my team has built a Stirling engine. However, we need to calculate the energy and efficiency of the engine. We're using a peanut butter jar lid as the flywheel, and so we need to calculate the kinetic energy of that.

## Homework Equations

KE=1/2mv^2

KE=1/2Iw^2

## The Attempt at a Solution

We're pretty sure the best way to find the KE is by using KE=1/2mv^2 and converting it to a rotational form to get KE=1/2(I)(w^2), where I is moment of inertia and w is angular velocity. I imagine that to find angular velocity we should just count how often the lid goes around, but I'm pretty lost on the moment of inertia.