<human>:  What is the moment of inertia of a car engine?
<bot>: The moment of inertia of a car engine is determined by its mass, size, and shape. It is generally expressed in terms of its mass moment of inertia, which is the sum of its mass times its radius of gyration squared. For example, a four-cylinder engine has a moment of inertia of approximately 0.15 kg m2.