What is the moment of inertia of a pendulum with a mass of #5 kg# that is #12 m# from the pivot?
In the most simple form, this is an equation that you may use for this type of problem (simple pendulum):
The following resources may help you further understand the concepts:
Best of luck in your studies!
(EDIT: the following response to the same question (with different values) has a lovely diagram which may further help enhance your understanding.)