Conversation so far:
what is the significance of mass moment of inertia
Rotational inertia is used to calculate angular momentum and allows us to explain (via conservation of angular momentum) how rotational motion changes when the distribution of mass changes.
what is the symbol for mass moment of inertia
The common symbol for Moment of inertia is I.
what is the si unit for mass moment of inertia
The SI unit for Moment of inertia is kg m^2
how is the moment used by people
Tightrope walkers use the moment of inertia of a long rod for balance as they walk the rope.

Question: who is a related scientist
Self-contained rewrite: who is a related scientist to moment of inertia